| 水永 秀樹（みずなが ひでき） | データ更新日：2024.04.12 |
准教授 ／
工学研究院
地球資源システム工学部門
地球工学講座
| 1. | Mohammad Hakim Rezayee, Ahamd Qasim Akbar, Torabaz Poyesh, Ezatullah Rawnaq, Khair Mohammad Samim, Hideki Mizunaga, 3D Geophysical Modeling Based on Multi-Scale Edge Detection, Magnetic Susceptibility Inversion, and Magnetization Vector Inversion in Panjshir, Afghanistan to Detect Probabilistic Fe-Polymetallic Bearing Zone , Geosciences, doi.org/10.3390/geosciences13120376, Online, 2023.12. |
| 2. | Mohammad Hakim Rezayee, Mahdi Khalaj, Hideki Mizunaga, Structural analysis and susceptibility inversion based on ground magnetic data to map the chromite mineral resources: a case study of the Koh Safi Chromite Ore Deposit, Parwan, Afghanistan , Geoscience Letters, doi.org/10.1186/s40562-023-00298-3, Online, 2023.11. |
| 3. | Liang Du, Jie Dou, Hideki Mizunaga, Zhongling Zong, Wenjin Zhu, Xiaotian Dong, Wenbo Wu, Real-Time Monitoring and Simultaneous Verification of Water Percolation Using Electrical Resistivity Tomography and Photography Techniques , Water, doi.org/10.3390/w15223999, Online, 2023.09. |
| 4. | Mel Anthony A. Casulla, Hideki MIZUNAGA, Characterization of potential Cu-Au mineralization using electrical resistivity and induced polarization methods: a case study in Eastern Labo, Bicol, Philippines, Journal of Geophysics and Engineering, DOI: 10.1093/jge/gxad018, Online, 2023.02. |
| 5. | Maryadi Maryadi, Annisa Firdaus, Ahmad Zarkasyi, Hideki Mizunaga, Electrical resistivity structure of Danau Ranau geothermal prospect area based on integrated 3-D Inversion of impedance tensor and tipper vector, Geothermics, doi.org/10.1016/j.geothermics.2022.102575, 106, Online, 2022.12. |
| 6. | Tamer FARAG, Mohamed Sobh, Hideki MIZUNAGA, 3D constrained gravity inversion to model Moho geometry and stagnant slabs of the Northwestern Pacific plate at the Japan Islands, Techtonophysics, doi.org/10.1016/j.tecto.2022.229297, 829, Online, 2022.03. |
| 7. | Hassan Mohamed, Hakim Saibi, Hideki MIZUNAGA, Baher Geith, Basement structure investigation using 3-D forward modeling and inversion of geomagnetic data of the Zeit basin area, Gulf of Suez, Egypt, Marine and Petroleum Geology, doi.org/10.1016/j.marpetgeo.2022.105637, 139, Online, 2022.03. |
| 8. | Mel Anthony A. Casulla, Hideki MIZUNAGA, Toshiaki TANAKA, Carla B. Dimalanta, Imaging crustal features and Moho depths through enhancements and inversion of gravity data from the Philippine island arc system, Progress in Earth and Planetary Science, doi.org/10.1186/s40645-022-00473-8, Online, 2022.03. |
| 9. | Maryadi, Hideki Mizunaga, Subsurface resistivity imaging of geothermal field by means of impedance tensor and magnetovariational data analysis, Proceedings of International Symposium on Earth Science and Technology 2021, 159-163, 2021.11. |
| 10. | Hao Chen, Hideki Mizunaga, Toshiaki Tanaka, Gang Wang, Maik Neukirch, Application of a new robust impedance estimator based on Hilbert-Huang transform for magnetotelluric method, Proceedings of International Symposium on Earth Science and Technology 2021, 253-256, 2021.11. |
| 11. | Tamer Farag, Hideki Mizunaga, 3-D interpretaion of airborne gravity data at Wadi El Assuity, Egypt, Proceedings of International Symposium on Earth Science and Technology 2021, 364-367, 2021.11. |
| 12. | Kazuto Inoue, Hao Chen, Toshiaki Tanaka, Hideki Mizunaga, Example of application of a new MT time series processing method, Proceedings of International Symposium on Earth Science and Technology 2021, 372-374, 2021.11. |
| 13. | Chuichi Inoue, Mizunaga Hideki, Toshiaki Tanaka, A study on visualization of underground roots using electrical techniques, Proceedings of International Symposium on Earth Science and Technology 2021, 368-371, 2021.11. |
| 14. | Shafiqullah Wahab, Hakim Saibi, Hideki Mizunaga, Groundwater aquifer detection using the electrical resistivity method at Ito Campus, Kyushu University (Fukuoka, Japan), Geoscience Letters, DOI: 10.1186/s40562-021-00188-6, 2021.04, An electrical resistivity survey was carried out using the pole–pole configuration around the Sayanokami spring area in the northern part of Ito Campus (Kyushu University, Fukuoka, Japan) to study the groundwater aquifer and its electrical characteristics. A Code Division Multiple Transmission (CDMT) system was used. The CDMT system transmits 24 currents simultaneously and measures 24 potential responses with monitoring of actual current waveforms. The system can inject current from multiple electrodes into the underground environment simultaneously using different individual current waveforms. The two-dimensional (2-D) inversion results of the electrical resistivity data indicate three layers from top to bottom, as follows: a) a thin layer with a thickness of 3 m and a low resistivity ( |
| 15. | Tamer FARAG, Nahal SOLIMAN, Atel El SHAYAT, Hideki MIZUNAGA, Comparison among the natural radioactivity levels, the radiogenic heat production, and the land surface temperature in arid environments: A case study of the El Gilf El Kiber area, Egypt, Journal of African Earth Sciences, DOI: 10.1016/j.jafrearsci.2020.103959, 172, 1-15, 2020.12. |
| 16. | Casula Mel Anthony Asis, Hideki Mizunaga, Toshiaki Tanaka, Torres Aniano, Subsurface Characterization using Geophysical and Hydrochemical Data: An Application to Groundwater Resources Management in Pampanga, Philippines, Proceedings of International Symposium on Earth Science and Technology 2020, 162-168, 2020.11. |
| 17. | Hao Chen, Hideki Mizunaga, Toshiaki Tanaka, Gang Wang, New strategy to calculate robust impedance using RMHHT estimator for continuous and discontinuous broadband magnetotelluric time-series data, Proceedings of International Symposium on Earth Science and Technology 2020, 169-172, 2020.11. |
| 18. | Yushin Higashi, Toshiaki Tanaka, Hideki Mizunaga, An Experimental Study on Quad-Loop EM Method, Proceedings of International Symposium on Earth Science and Technology 2020, 426-429, 2020.11. |
| 19. | Soichiro Hashimoto, Toshiaki Tanaka, Hideki Mizunaga, A New Techniques of Resistivity Measurement for Drilling Cores, Proceedings of International Symposium on Earth Science and Technology 2020, 436-439, 2020.11. |
| 20. | Abebayehu Andarge Mengiste, Hideki Mizunaga, Toshiaki Tanaka, 1-D and 2-D Inversions of Magnetotelluric Data in Butajira Geothermal Field, Ethiopia, Proceedings of International Symposium on Earth Science and Technology 2020, 440-444, 2020.11. |
| 21. | Hassan MOHAMED, Hideki MIZUNAGA, Hakim SAIBI, Computation of geophysical magnetic data for a buried 3-D hexahedral prism using the Gauss–Legendre quadrature method, Near Surface Geophysics, doi: 10.1002/nsg.12104, 18, 5, 575-588, 2020.09, A new method is presented for the 3-D forward modelling of the magnetic effects (induced magnetization) of a hexahedral (trilinear) prism using the Gauss–Legendre quadrature method. The 3-D forward modelling provides an improved application to geological problems. The magnetic effect has been evaluated via the summation of the effects of the point dipole that fills the volume. The 3-D volume is divided into smaller prisms using an appropriate number of nodes. The algorithm is tested on two synthetic examples, and the results are compared against calculated data from a common program developed at the University of British Columbia–Geophysical Inversion Facility, with both tests showing positive results. The results of testing the algorithm against two synthetic slab models are also given. Finally, the program is applied to a field data set from Aynak-Logar Valley region in Afghanistan. Using this program, complex 3-D model bodies may be constructed from hexahedral prisms to facilitate the calculation of their magnetic anomalies and magnetic susceptibility. Interpretation of the results shows that 3-D constructed models are successful in recovering the shape and location of the true model.. |
| 22. | Tumbu Lucus BONIFACE, Hideki MIZUNAGA, Multi-dimensional Resistivity Imaging from Magnetotelluric Data and its Geological Interpretation in Keijo-Mbaka Geothermal Field, South-West Tanzania , Proceedings of International Symposium on Earth Science and Technology 2019, 25-31, 2019.12. |
| 23. | Mohammad SHEHATA, Hideki MIZUNAGA, An Enhanced Edge Detection Technique for Potential Field Data; Case Study of Western USA, Proceedings of International Symposium on Earth Science and Technology 2019, 484-487, 2019.12. |
| 24. | Hao CHEN, Hideki MIZUNAGA, Toshiaki TANAKA, The research on the application of Hilbert-Huang transformation to time series magnetotelluric data, Proceedings of International Symposium on Earth Science and Technology 2019, 332-335, 2019.12. |
| 25. | Yusuke KIYOMOTO, Hideki MIZUNAGA, Toshiaki TANAKA, Development of Magnetotelluric 1-D Sparse Inversion, Proceedings of International Symposium on Earth Science and Technology 2019, 328-331, 2019.12. |
| 26. | Tamer FARAG, Nehal SOLIMAN, Atef El SHAYAT, Hideki MIZUNAGA, Landsat 8 and Airborne Geophysical Data Interpretations to Investigate the Radioactivity Hazards at El Gilf El Biber Area, South Western Desert, Egypt, Proceedings of International Symposium on Earth Science and Technology 2019, 458-461, 2019.12. |
| 27. | Soichiro HASHIMOTO, Toshiaki TANAKA, Hideki MIZUNAGA, Resistivity measurement technique using capacitor electrodes, Proceedings of International Symposium on Earth Science and Technology 2019, 488-491, 2019.12. |
| 28. | 水永 秀樹, 埋蔵文化財の電気探査, 計測と制御, 58, 11, 858-862, 2019.11. |
| 29. | Mohammad Shehata, Hideki Mizunaga, Geospatial analysis of surface hydrological parameters for Kyushu Island, Japan, Natural Hazards, 10.1007/s11069-018-3528-0, 96, 1, 33-52, 2019.03, [URL], Defining the surface hydrological parameters represents a crucial factor for the sustainable development purposes. In areas with heavy precipitation and rugged topography, these parameters control the occurrence of some natural hazards, from which the flash flood gets the most attention. Traditional methods for the assessment of the surface hydrological parameters are costly, time-consuming and provide information for limited geographic extent. On the other hand, remotely sensed data provide a cost-effective, rapid and wide aerial coverage with adequate accuracy. Geospatial analysis of these remotely sensed data provides a suitable and effective method for the reconnaissance determination of the surface hydrological parameters. In this work, digital elevation models, Landsat 8 satellite images as well as digital maps of soil and land use for Kyushu Island were acquired and analyzed using geographic information system. Surface hydrological parameters were determined in terms of watershed boundaries, soil moisture, initial abstraction as well as flash flood potentiality. Results of this research show a great correlation with historical flash flood events that occurred in the island. The northern parts of the island are subjected to the threat of flash floods. A follow-up is recommended in some areas on the island. As a conclusion, the geospatial analysis performs an accurate reconnaissance method for hydrological analysis at regional scale, which in turn guides the detailed field observation saving time and cost.. |
| 30. | Jean d’Amour Uwiduhaye, Hideki Mizunaga, Hakim Saibi, A case history 3-D gravity modeling using hexahedral element in Kinigi geothermal field, Rwanda, Arabian Journal of Geosciences, 10.1007/s12517-019-4249-8, 12, 3, 2019.02, [URL], It is important for geothermal exploration to know regional subsurface structures. The gravity survey is often used to narrow down the promising area at the early stage of geothermal exploration. The gravity survey was carried out to estimate subsurface density structure in the Kinigi geothermal field, Rwanda, in September 2015. In order to interpret the gravity anomaly distribution, 3-D gravity modeling was done by using the new program based on Gauss-Legendre integration using hexahedral elements. As the result, the computed gravity anomalies showed high gravity anomalies in northwest, the northeast, and east-southeast of the studied field and low anomalies in the southwest side of the studied field as Bouguer anomalies. The area was characterized by normal contacts with main boundary trending NW-SE direction. This boundary was estimated as main fault in Kinigi geothermal field, Rwanda. The detected fault could be a better place for installing geothermal wells for future geothermal development in the region.. |
| 31. | Mohammad SHEHATA, Hideki MIZUNAGA, Directionality and Mimensionality Analysis of USArray Magnetotelluric Data from Weatern USA, Proceedings of International Symposium on Earth Science and Technology 2018, 38-41, 2018.11. |
| 32. | Tumbu Lucus BONIFACE, Hideki MIZUNAGA, Three-dimensional Inversion of MT Data to Geothermal Systems in Kisaki Geothermal Field, Eastern Tanzania, Proceedings of International Symposium on Earth Science and Technology 2018, 487-493, 2018.11. |
| 33. | Yosuke KIYOMOTO, Hideki MIZUNAGA, Toshiaki TANAKA, Archaeological Survey for Genko Borui Using Ground Penetrating Radar, Proceedings of International Symposium on Earth Science and Technology 2018, 558-561, 2018.11. |
| 34. | Gosuke HOSHINO, Hideki MIZUNAGA, Toshiaki TANAKA, Development of a Simulator for 3-D Long-offset TEM Method, Proceedings of International Symposium on Earth Science and Technology 2018, 562-565, 2018.11. |
| 35. | Hideaki EJIMA, Hideki MIZUNAGA, Toshiaki TANAKA, Detection and Classification of Anomalies in GPR B-scan Data, Proceedings of International Symposium on Earth Science and Technology 2018, 566-568, 2018.11. |
| 36. | Shokai IWAMOTO, Hideki MIZUNAGA, Toshiaki TANAKA, GPR Survey at Kuratsukasa Erea in Dazaifu Historical Site, Fukuoka Prefecture, Japan, Proceedings of International Symposium on Earth Science and Technology 2018, 569-571, 2018.11. |
| 37. | Kazuki YAMADA, Hideki MIZUNAGA, Toshiaki TANAKA, Spectrum Analysis of Gamma Ray Data to Extract Spectrum Peaks, Proceedings of International Symposium on Earth Science and Technology 2018, 572-574, 2018.11. |
| 38. | Yusuke EGUSA, Hideki MIZUNAGA, Toshiaki TANAKA, 3-D Simulation of Square Array Resistivity Method Considering the Effects of Mixture of Soil-Cement, Proceedings of International Symposium on Earth Science and Technology 2018, 575-578, 2018.11. |
| 39. | Hassan Mohamed, Hakim Saibi, Mohand Bersi, Sami Abdelnabi, Baher Geith, Hamdy Ismaeil, Thomas Tindell, Hideki Mizunaga, 3-D magnetic inversion and satellite imagery for the Um Salatit gold occurrence, Central Eastern Desert, Egypt, Arabian Journal of Geosciences, 10.1007/s12517-018-4020-6, 11, 21, 2018.11, [URL], The Um Salatit is a gold occurrence situated in the Central Eastern Desert of Egypt. The studied area is characterized by an intensive imbrication zone of serpentinites and metavolcanic rocks. The integrated use of aeromagnetic and spectral reflectance remote sensing data has proved effective for mapping geology related to ore deposits. Spectral reflectance maps have been produced to discriminate various rocks, such as serpentinites, gabbros, and metavolcanic rocks. 3-D inversion of aeromagnetic data acquired over the Um Salatit study area produced a 3-D magnetic susceptibility model showing magnetic bodies surrounded by less magnetic host rock. The magnetic features are elongated ENE-WSW parallel to the major thrust fault and mapped the Um Salatit serpentinized rocks. Remote sensing data allow investigating surficial geological features and mapping the mineralized areas. Remote results, in conjunction with 3-D inversion of aeromagnetic data, demonstrate that gold occurrence in the study area was effectively restricted to the highly magnetic zone interpreted as host rocks.. |
| 40. | Uwiduhaya Jean d'Amour, Hakim Saibi, Hideki Mizunaga, Edge detection and 3-D gravity inversion at Kinigi geothermal field, Rwanda, Proceedings of 7th African Rift Geothermal Conference at Kigali, Rwanda, CD-ROM, 2018.10. |
| 41. | Cherkose Biruk Abera, Hideki Mizunaga, F. Samrock, Imaging Resistivity Structures of High-Enthalpy Geothermal Systems Using Magnetotelluric Method: A case study of Aluto-Langano geothermal field in Ethiopia, Proceedings of 7th African Rift Geothermal Conference at Kigali, Rwanda, CD-ROM, 2018.10. |
| 42. | Jean d.Amour Uwiduhaye, Hideki Mizunaga, Hakim Saibi, Geophysical investigation using gravity data in Kinigi geothermal field, northwest Rwanda, Journal of African Earth Sciences, 10.1016/j.jafrearsci.2017.12.016, 139, 184-192, 2018.03, [URL], A land gravity survey was carried out in the Kinigi geothermal field, Northwest Rwanda using 184 gravity stations during August and September, 2015. The aim of the gravity survey was to understand the subsurface structure and its relation to the observed surface manifestations in the study area. The complete Bouguer Gravity anomaly was produced with a reduction density of 2.4 g/cm3. Bouguer anomalies ranging from −52 to −35 mGals were observed in the study area with relatively high anomalies in the east and northwest zones while low anomalies are observed in the southwest side of the studied area. A decrease of 17 mGals is observed in the southwestern part of the study area and caused by the low-density of the Tertiary rocks. Horizontal gradient, tilt angle and analytical signal methods were applied to the observed gravity data and showed that Mubona, Mpenge and Cyabararika surface springs are structurally controlled while Rubindi spring is not. The integrated results of gravity gradient interpretation methods delineated a dominant geological structure trending in the NW-SE, which is in agreement with the regional geological trend. The results of this gravity study will help aid future geothermal exploration and development in the Kinigi geothermal field.. |
| 43. | Biruk Abera Cherkose, Hideki Mizunaga, Resistivity imaging of Aluto-Langano geothermal field using 3-D magnetotelluric inversion, Journal of African Earth Sciences, 10.1016/j.jafrearsci.2017.12.017, 139, 307-318, 2018.03, [URL], Magnetotelluric (MT) method is a widely used geophysical method in geothermal exploration. It is used to image subsurface resistivity structures from shallow depths up to several kilometers of depth. Resistivity imaging using MT method in high-enthalpy geothermal systems is an effective tool to identify conductive clay layers that cover the geothermal systems and to detect a potential reservoir. A resistivity model is vital for deciding the location of pilot and production sites at the early stages of a geothermal project. In this study, a 3-D resistivity model of Aluto-Langano geothermal field was constructed to map structures related to a geothermal resource. The inversion program, ModEM was used to recover the 3-D resistivity model of the study area. The 3-D inversion result revealed the three main resistivity structures: a high-resistivity surface layer related to unaltered volcanic rocks at shallow depth, underlain by a conductive zone associated with the presence of conductive clay minerals, predominantly smectite. Beneath the conductive layer, the resistivity increases gradually to higher values related to the formation of high-temperature alteration minerals such as chlorite and epidote. The resistivity model recovered from 3-D inversion in Aluto-Langano corresponds very well to the conceptual model for high-enthalpy volcanic geothermal systems. The conductive clay cap is overlying the resistive propylitic upflow zone as confirmed by the geothermal wells in the area.. |
| 44. | Maryadi Maryadi, Hideki Mizunaga, Estimation of Static Temerature Distribution by Means of Audio-Magnetotelluric Data, Proceedings of 43rd Workshop on Geothermal Reservoir Engineering, Stanford University, CD-ROM, 2018.02. |
| 45. | Mohammad Shehata, Hideki Mizunaga, Flash Flood Risk Assessment for Kyushu Island, Japan, Environmental Earth Sciences, 10.1007/s12665-018-7250-8, 77, 3, 2018.02, [URL], Using advanced geospatial analysis technologies, flash flood risk is assessed for the island of Kyushu, Japan. In this study, the flash flood risk is redefined in terms of the flash flood potential index (FFPI) and the flash flood residential hazard (FFRH). The island experiences rainy weather, especially in the summer (June–August), when catastrophic flash flood events have historically occurred. Studies of the surface hydrological properties of the island are very rare and localized; hence, geospatial techniques are most appropriate for the assessment process. The Soil Conservation Service rainfall-runoff model was used to estimate hydrological responses on the island. Four factors were included in the flash flood assessment. A multi-criteria analysis was carried out to map the FFPI and FFRH from the evaluation factors. The results show that the highest flash flood risk occurs in the northern parts of the island, where the soil displays relatively low infiltration rates and relatively high curve numbers, despite the comparatively low precipitation rates that occur there. The results indicate that soil hydrological properties are the main driving forces of flash floods, especially in regions with low precipitation rates. The results of this research are consistent with previous in situ measurements of runoff made at several sites on the island. The results also show a strong geographic correlation with historical flash flood events on the island. This research validates the use of geospatial analysis for large geographic regions where in situ measurements cannot be taken due to time or cost constraints. The results of this study provide decision makers with the information needed to select a management strategy to address possible future flash flood events that considers safety and water harvesting.. |
| 46. | Ho Trong Long, Hideki Mizunaga, Keisuke Ushijima, Borehole-to-surface electrical data interpretation at Takigami geothermal field in Kyushu, Japan using neural network, Society of Exploration Geophysicists International Exposition and 76tth Annual Meeting 2006, SEG 2006 Society of Exploration Geophysicists - SEG International Exposition and 76tth Annual Meeting 2006, SEG 2006, 1318-1322, 2018.01, This paper deals with the application of neural network technique for the three-dimension interpretation of mise-à-la-masse data from the Takigami geothermal field in Kyushu, which is one of the most active geothermal area in Japan. To understand the structure of the geothermal field, a 4-layers neural network had been developed. The training algorithm for the network is back-propagation with five paradigms, e.g. on-line back-propagation, batch back-propagation, delta-bar-delta, resilient propagation (RPROP) and quick propagation, were applied to find out the most efficient one. The network was trained with 3-D mise-à-la-masse simulation data set, including 864 cases of a single anomalous resistivity block of 10 Ohm.m moving in the model mesh with background resistivity of 100 Ohm.m. To generate the training data set, a high accuracy algorithm for 3-D numerical simulation, based on finite difference method and the algorithm of the singularity removal, was used. The trained network was tested by a synthetic data and then applied for the real field data set of the study area. The obtained results are remarkably correlated with the other available data from the field such as previous geoelectrical data, formation temperatures, lost circulation zones, hence, promising zones for production or re-injection can be indicated quickly at site of Takigami geothermal field.. |
| 47. | Mohammad SHEHATA, Hideki MIZUNAGA, Deliniation of the Magnetotelluric Triple Junction Structure Based on Potrential Field Data Interpretation, Proceedings of International Symposium on Earth Science and Technology 2017, 54-59, 2017.12. |
| 48. | Maryadi MARYADI, Hideki MIZUNAGA, Analysis of Audio-frequency Magnetotelluric Data for THree-dimensional Deep Temperature Reconstruction, Proceedings of International Symposium on Earth Science and Technology 2017, 68-71, 2017.12. |
| 49. | CHERKOSE Biruk Abera, Hideki MIZUNAGA, 3-D Magnetotelluric Inversion to Map Geothermal Structures in Aluto-Langano Geothermal Field, Ethiopia, Proceedings of International Symposium on Earth Science and Technology 2017, 483-486, 2017.12. |
| 50. | Yosef KEBEDE, Hideki MIZUNAGA, Dimensionalitu Analysis of Magnetotelluric Data from Tendaho-Alalobeda Geothermal Field, Northeast Ethiopia, Proceedings of International Symposium on Earth Science and Technology 2017, 518-523, 2017.12. |
| 51. | Albertus ARIEL, Hideki MIZUNAGA, A New Technique for Noise Reduction of Megnetotelluric Data by Using Cepstrum Analysis, Proceedings of International Symposium on Earth Science and Technology 2017, 556-559, 2017.12. |
| 52. | Shafiqullah WAHAB, Hideki MIZUNAGA, Applications of 2-D Resistivity Inversion, Case Studies: Groundwater and Mineral Exploration, Proceedings of International Symposium on Earth Science and Technology 2017, 560-565, 2017.12. |
| 53. | Daniel GALLAGHER, Hideki MIZUNAGA, Archaeological Prospection at Dazaifu's Kuratsukasa Area by FDEM, Proceedings of International Symposium on Earth Science and Technology 2017, 566-570, 2017.12. |
| 54. | Shunichi OKAMOTO, Toshiaki TANAKA, Hideki MIZUNAGA, Development of a Measurement Instrument Controlled by PSoC5LP for Fluid Flow Electromagnetic Method, Proceedings of International Symposium on Earth Science and Technology 2017, 571-573, 2017.12. |
| 55. | Gosuke HOSHINO, Hideki MIZUNAGA, Toshiaki TANAKA, Development of a Ray Tracing Program for Seismic Refraction Method, Proceedings of International Symposium on Earth Science and Technology 2017, 574-576, 2017.12. |
| 56. | Ryosuke NAGAWA, Hideki MIZUNAGA, Toshiaki TANAKA, Development of an Inversion Program of Marine TEM Using PSO, Proceedings of International Symposium on Earth Science and Technology 2017, 577-579, 2017.12. |
| 57. | Syokai IWAMOTO, Hideki MIZUNAGA, Toshiaki TANAKA, GPR Survey at Kuratsukasa District in Dazaifu Historical Site, Fukuoka Prefecture, Japan, Proceedings of International Symposium on Earth Science and Technology 2017, 580-582, 2017.12. |
| 58. | Kazuki YAMADA, Hideki MIZUNAGA, Radioactive Exploration in Ito Campus Using Gamma Ray Spectrometer, Proceedings of International Symposium on Earth Science and Technology 2017, 583-585, 2017.12. |
| 59. | Hideaki EJIMA, Hideki MIZUNAGA, Toshiaki TANAKA, Recognition of Buried Objects of GPR Using CNN, Proceedings of International Symposium on Earth Science and Technology 2017, 586-588, 2017.12. |
| 60. | Yusuke EGUSA, Hideki MIZUNAGA, Toshiaki TANAKA, Simulation of Square Array Resistivity Method to Detect Subsurface Layer Boundaries, Proceedings of International Symposium on Earth Science and Technology 2017, 589-591, 2017.12. |
| 61. | Hassan Mohamed, Hideki Mizunaga, Nasser Mohamed Abou Ashour, Refaat Ahmed Elterb, Ibrahim Mostafa Elalfy, Ayman Shebel Elsayed, Radiogenic heat production in Rudeis Formation, Lower Miocene, Belayim marine oil field, Gulf of Suez, Egypt, Exploration Geophysics, 10.1071/EG15021, 48, 4, 512-522, 2017.12, [URL], This study describes radiogenic heat production (RHP) estimated from two sets of well logging data recorded in Rudeis Formation, Belayim marine oil field. Subsurface total count gamma-ray (GR) data were recorded in nine wells, seven of which possessed spectrometric data (eU, eTh, and K). The data show that RHP estimated from GR logs (ABR) varies from 0.13 to 1.73μW/m3, with an average of 0.7μW/m3 and a standard deviation of 0.26μW/m3. In addition, 72.9% of RHP values fall within the range of 0.6-1.0μW/m3. RHP estimated from the concentrations of radioactive elements (AR) vary from 0.13 to 2.1μW/m3, with an average 0.71μW/m3 and a standard deviation of 0.38μW/m3. 50% of these RHP values fall within the range of 0.6-1.0μW/m3. Cross-correlation of ABR and AR calculations yielded a moderate fit of 0.75. The three-dimensional (3D)-slicing of the reservoir shows that the northern and north-western parts of the study area have higher RHP compared to other parts. The estimated RHP can produce enough heat which has an effect on the hydrocarbon potential in Rudeis Formation.. |
| 62. | 水永秀樹，山口盛一，田中俊昭，牛島恵輔 , 比抵抗法による岩原双子塚古墳の内部構造の三次元可視化, 考古学と自然科学, 74, 29-43, 2017.11. |
| 63. | 水永秀樹，石永清隆, 時間領域IP法の2.5次元モデリングとインバージョン, 物理探査, 70, 69-79, 2017.10. |
| 64. | Salahadine MAHAMOUD HASSAN, Hideki Mizunaga, 1D inversion f magnetotelluric data for the Lake Abhe geothermal field, Djibouti, 九大地熱・火山研究報告, 22, 60-63, 2017.03. |
| 65. | Muhammad Istiwan NURPRATAMA, Hideki Mizunaga, Interpretation of 1D and 2D MT Inversion Resukt in Dieng Geothermal Field, Indonesia, 九大地熱・火山研究報告, 22, 72-76, 2017.03. |
| 66. | Philip Yasiro IRARUE, Hideki Mizunaga, １D and 2D Inversion of the BC87 Magnetotelluric Dataset, 九大地熱・火山研究報告, 22, 85-89, 2017.03. |
| 67. | Jean d'Amour UWIDUHAYE, Hideki Mizunaga, Hakim SAIBI, Gravity survey in Kinigi geothermal field, Rwanda, Proceedings of International Symposium on Earth Science and Technology 2016, 118-123, 2016.12. |
| 68. | Akitaka NAKAMURA, Hideki Mizunaga, 1D modeling of TEM method in consideration of IP effect, Proceedings of International Symposium on Earth Science and Technology 2016, 473-475, 2016.12. |
| 69. | Daniel GALLAGHER, Hideki Mizunaga, 1-D forward modeling of airborne transient electromagnetic method, Proceedings of International Symposium on Earth Science and Technology 2016, 476-479, 2016.12. |
| 70. | Keisuke IKEDA, Hideki Mizunaga, Toshiaki Tanaka, GPR survey at Onigaura tunnel tombs and 2-D simulation, Proceedings of International Symposium on Earth Science and Technology 2016, 486-488, 2016.12. |
| 71. | Shogo HAMADA, Hideki Mizunaga, Toshiaki Tanaka, A study on identification of signal and noise in fluid flow electromagnetic method, Proceedings of International Symposium on Earth Science and Technology 2016, 489-491, 2016.12. |
| 72. | Maryadi MARYADI, Hideki Mizunaga, Correlation analysis between audio-magnetotelluric and borehole thermograms data for developing electromagnetic geothermometry, Proceedings of International Symposium on Earth Science and Technology 2016, 492-497, 2016.12. |
| 73. | Biruk Abera CHERKOSE, Hideki Mizunaga, Megnetotelluric investigation in Aluto-Langano geothermal field, Ethiopia, Proceedings of International Symposium on Earth Science and Technology 2016, 510-514, 2016.12. |
| 74. | Mohammad SHEHATA, El-Arabi SHENDI, Tamer ATTIA, Ahmed WAHID, Hideki Mizunaga, Geophysical, remote sensing and GIS applications for environmental impact assessment and landfill-site selection inPort Said, Egypt, Proceedings of International Symposium on Earth Science and Technology 2016, 586-589, 2016.12. |
| 75. | Salahadine MAHAMOUD, Hideki Mizunaga, 1D inversion f magnetotelluric data for the Lake Abhe geothermal field, Djibouti, Proceedings of International Symposium on Earth Science and Technology 2016, 607-611, 2016.12. |
| 76. | Muhammad Istiwan NURPRATAMA, Hideki MIZUNAGA, Interpretation of 1D and 2D magnetotelluric inversions for the Dieng geothermal field, Indonesia, Proceedings of International Symposium on Earth Science and Technology 2016, 620-623, 2016.12. |
| 77. | Hassan MOHAMED, Hideki Mizunaga, Nasser Mohamed Abou Ashour, Refaat Ahmed Elterb, Ibrahim Mostafa Elalfy, Ayman Shebel Elsayed, Radiometric heat production in Rudesis Formation, Lower Miocene, Belayim marine oil field, Gulf od Suez, Egypt, Exploration Geophysics, (Published online September 2016), 2016.09. |
| 78. | Satoru Yamaguchi, Hideki Mizunaga, Taishiro Katsu, Satoshi Nakamuta, Yasuki Kono, Preliminary Design of an Underwater Glider for Ocean Floor Resources Exploration, Proceedings of the Twenty-sixth (2016) International Ocean and Polar Engineering Conference, Rodes, Greece, 590-594, 2016.06. |
| 79. | 水永秀樹, 重力偏差の3次元モデリングと相関トモグラフィ, 物理探査, 69, 2, 87-101, 2016.05. |
| 80. | Satoru Yamaguchi, Hideki Mizunaga, Taishiro Katsu, Satoshi Nakamuta, Yasuki Kono, Preliminary design of an underwater glider for ocean floor resources exploration, 26th Annual International Ocean and Polar Engineering Conference, ISOPE 2016 Proceedings of the 26th International Ocean and Polar Engineering Conference, ISOPE 2016, 2016-January, 590-594, 2016.01, In this paper, the authors propose a novel exploration system for ocean floor resources using an autonomous underwater glider and OBEM (Ocean bottom electromagnetometer). Studies on the gliding performance and the hydrodynamic characteristics of several kinds of body shape were carried out for the preliminary design of the system. Gliding ratios in a steady flow were estimated based on CFD calculation for different main wing shapes. The effects of the size of the body and the camber of the main wing were examined as well. It was confirmed that designed vehicle had efficient gliding performance to achieve the autonomous OBEM measurement.. |
| 81. | Hassan MOHAMED, Hideki Mizunaga, Hakim SAIBI, Ali ABDELAZIZ, Three-dimensional Forward Modeling of Geomagnetic Data Using Hexahedral Element with Application to Zeit Basin Area, Gulf of Suez, Egypt, Proceedings of International Symposium on Earth Science and Technology 2015, 155-160, 2015.12. |
| 82. | Kyosuke TANNO, Hideki Mizunaga, 3-D Inversion of Gravity Method Using Quantum Annealing, Proceedings of International Symposium on Earth Science and Technology 2015, 306-308, 2015.12. |
| 83. | Satoshi TANIMURA, Hideki MIZUNAGA, Development of One-dimensional Inversion Program of Marine Controlled Source Electromagnetic (MCSEM) Method with Particle Swarm Optimization, Proceedings of International Symposium on Earth Science and Technology 2015, 309-312, 2015.12. |
| 84. | Keisuke IKEDA, Hideki MIZUNAGA, GPR Survey at Funabaru Ruins in Koga City, Fukuoka Prefecture, Japan, Proceedings of International Symposium on Earth Science and Technology 2015, 313-316, 2015.12. |
| 85. | Shogo HAMADA, Hideki MIZUNAGA, Toshiaki TANAKA, Research about Measurement of Marine MT Probe's Posture, Proceedings of International Symposium on Earth Science and Technology 2015, 317-319, 2015.12. |
| 86. | Jean d'Amour UWIDUHAYE, Hideki MIZUNAGA, 3-D Simulation of Gravity Method Using Gauss-Legendre Integration, Special Issue of the Joint Program of Sustainable Resources Engineering, JPSRE, International Symposium on Earth Science and Technology 2015, 25-28, 2015.12. |
| 87. | Akitaka NAKAMURA, Hideki MIZUNAGA, Saline Contamination Research in Motooka Using TEM Method, Special Issue of the Joint Program of Sustainable Resources Engineering, JPSRE, International Symposium on Earth Science and Technology 2015, 33-35, 2015.12. |
| 88. | 水永秀樹, 連続オイラー変換を用いた高精度なリニアフィルター, 物理探査, 68, 1, 1-12, 2015.01. |
| 89. | Shota Kukita, Hideki Mizunaga, Three-dimensional Forward Modeling of Airborne TEM Method, Proceedings of International Symposium on Earth Science and Technology 2014, 272-274, 2014.12. |
| 90. | Kenta KUMA, Hideki MIZUNAGA, Toshiaki TANAKA, Three-dimensional Modeling and Inversion of Fluid Flow Electromagnetic Method, Proceedings of International Symposium on Earth Science and Technology 2014, 275-278, 2014.12. |
| 91. | Satoshi TANIMURA, Hideki MIZUNAGA, Yutaka SASAKI, One-dimensional Forward Modeling of Marine Controlled Source Electromagnetic (MCSEM) Method, Expanded Abstracts by the Students of the School on the Move in AJ-BCEP, International Symposium on Earth Science and Technology 2014, 358-361, 2014.12. |
| 92. | Kyosuke TANNO, Hideki MIZUNAGA, Three-dimensional Forward Modeling of the Gravity Exploration Using the Hexahedral Element, Expanded Abstracts by the Students of the School on the Move in AJ-BCEP, International Symposium on Earth Science and Technology 2014, 362-365, 2014.12. |
| 93. | Shota Kukita, Hideki Mizunaga, Toshiaki TANAKA, 3-D Forward Modeling of Airborne TEM Method for Wide Geothermal Area, Proceedings of Grand Renewable Energy 2014 International Conference, 2014.07. |
| 94. | Kenta Kuma, Hideki Mizunaga, Toshiaki TANAKA, Three-dimensional Numerical Simulation of Fluid Flow Electromagnetic Method for Geothermal Fluid, Proceedings of Grand Renewable Energy 2014 International Conference, 2014.07. |
| 95. | 水永 秀樹, 田中俊昭, TEM法解析プログラムTemtoolの開発, 物理探査, 67, 2, 135-142, 2014.04. |
| 96. | Takeru Okuzawa, Toshiaki Tanaka, Hideki Mizunaga, Development of a Practical Measurement Equipment for Time-domain IP Method, Proceedings of the International Symposium on Earth Science and Technology 2013, 315-316, 2013.12. |
| 97. | Shota Kukita, Hideki Mizunaga, Field Experiments and 3-D Numerical Modeling of UXO Detection by TEM Method, Special Issue of the School on the Move in AJ-BCEP, International Symposium on Earth Science and Technology 2013, 30-31, 2013.12. |
| 98. | Ryosuke Okumoto, Hideki Mizunaga, New Algorithm to Calculate Transient Response of Time-domain IP Method, Proceedings of the International Symposium on Earth Science and Technology 2013, 317-320, 2013.12. |
| 99. | Wei Deng, Hideki Mizunaga, Yutaka Sasaki, Stepwise 3-D Resistivity Inversion and Sensitibity Factor Analysis, Proceedings of the International Symposium on Earth Science and Technology 2013, 321-327, 2013.12. |
| 100. | Kenta Kuma, Hideki Mizunaga, Three-dimensional Forward Program of Fluid Flow Electromagnetic Method, Special Issue of the School on the Move in AJ-BCEP, International Symposium on Earth Science and Technology 2013, 32-33, 2013.12. |
| 101. | Tateyuki Negi, Hideki Mizunaga, Yuji Mitsuhata, Quality improvement in the magnetotelluric spectrum using multiple far remore references, Proceedings of the 11th SEGJ International Symposium, USB (only digital data) , 2013.11. |
| 102. | Shota Kukita, Hideki Mizunaga, UXO detection using small loop TEM method, Proceedings of the 11th SEGJ International Symposium, USB (only digital data) , 2013.11. |
| 103. | Hideki Mizunaga, 井上敬夫, 福岡県那珂川町・安徳台遺跡群の地中レーダ探査, 物理探査, 66, 4, 287-294, 2013.10. |
| 104. | Tateyuki Negi, Hideki Mizunaga, Koichi Asamori, Koji Umeda, Three-dimensional magnetotelluric inversion using a heterogeneous smoothness-constrained least-squares method, Exploration Geophysics, 10.1071/EG13026, 44, 3, 145-155, 2013.09, [URL], This paper presents a fast algorithm for electromagnetic data inversion to three-dimensional (3D) resistivity models. The algorithm is distinctive for the level of accuracy it attains while bypassing the sensitivity matrix update. A common sensitivity matrix for homogeneous half-space is used in all iterations. Instead of updating the sensitivity matrix, the smoothness filter coefficients at each model element are updated, based on the spatial variations in resistivity in the model derived from the latest iteration. This substitution is expected not only to reduce the computation time required for large-scale inversions, such as those for 3D surveys, but also to allow the resolution of sharp boundaries in resistivity structures. Our algorithm was applied to 3D magnetotelluric inversion in order to confirm its effectiveness. Using synthetic examples under several conditions, we demonstrated that the method can reduce the number of forward calculations required to reduce data misfits to noise level, and that the method is robust for constructing target models even with sharp boundaries without generating fatally false resistivity structures or boundaries under noisy conditions.. |
| 105. | Tateyuki Negi, Hideki Mizunaga, Toshihiro Uchida, A Technique for Calculating Magnetotelluric Impedance Based on the Presence of Noise, Journal of Novel Carbon Resource Sciences, Vol.6, 36-40, 2012.09. |
| 106. | Takao Inoue and Hideki Mizunaga, Numerical modeling of ground penetrating radar using FDTD method, Proceedings of International Symposium on Earth Science and Technology 2011, 475-478, 2011.12. |
| 107. | Chikara Okada, Hideki Mizunaga and Yutaka Sasaki, The efficacy of SIP parametrical analysis using modefied Cole-Cole equation, Proceedings of International Symposium on Earth Science and Technology 2011, 471-474, 2011.12. |
| 108. | Tateyuki Negi, Hideki Mizunaga, Koichi Asamori and Koji Umeda, Three dimensional magnetotelluric imaging of the source area of 2000 Western Tottori earthquake using heterogeneous smoothness-constraint least-squares method, Proceedings of International Symposium on Earth Science and Technology 2011, 341-344, 2011.12. |
| 109. | Tateyuki Negi, Hideki Mizunaga, Koichi Asamori and Koji Umeda, Three dimensional magnetotelluric imaging of the fault in the 2000 Western Tottori, Japan using heterogeneous smoothness-constraint least-squares method, Proceedings of 10th SEGJ International Symposium, 2011.11. |
| 110. | Nureddin M. Saadi, Koichiro Watanabe, Hideki Mizunaga, Evaluation of image processing methods for geological interpretation in the different environments in Libya, Arabian Journal of Geosciences, 10.1007/s12517-010-0241-z, 4, 3-4, 635-643, 2011.01, [URL], This study evaluates the use of image processing techniques and methodologies of digital integration of multi-disciplinary geoscientific data to reduce the ambiguity in geological interpretations in different geological environments in Libya. To realize this objective, three areas were selected for this study; Eljufra, an arid environment; the mountainous environment Tarhunah; and the Jifara Plain, a coastal plain environment. Two types of remote sensing data were used in this study: Landsat Enhanced Thematic Mapper Plus (ETM+) and European Remote Sensing Satellite. The digital elevation model extracted from Shuttle Radar Topography Mission and digital topographic maps scale 1:50,000 were used for remote sensing interpretation. GIS and remote sensingbased methods were used to process and integrate all raster and vector layers data. This study offered dramatic benefits for geological interpretations and provided new insights into the efficiency of image processing methods in different geological environments.. |
| 111. | Kiyotaka Ishinaga and Hideki Mizunaga, 2.5-D Modeling of Time-domain IP Method, Proceedings of International Symposium on Earth Science and Technology 2010, 437-440, 2010.12. |
| 112. | Hiraku Murata, Yutaka Sasaki and Hideki Mizunaga, Joint Analysis of Marine MT and CSEM Data, Proceedings of International Symposium on Earth Science and Technology 2010, 441-444, 2010.12. |
| 113. | 水永秀樹，中川慶，牛島恵輔, デコンボリューションフィルターを用いた水平電気探査データの解析, 文化財と探査, 12, 1&2, 3-12, 2010.12. |
| 114. | 水永秀樹，牛島恵輔，竹下裕人, 弾性波トモグラフィによる今宿大塚古墳の遺跡探査, 文化財と探査, 12, 1&2, 13-19, 2010.12. |
| 115. | 水永秀樹，黒木敬悟，田中俊昭, F-Kマイグレーションを用いた地中レーダの三次元可視化, 文化財と探査, 11, 2, 13-18, 2010.05. |
| 116. | 水永秀樹，田中俊昭，牛島恵輔，宮本一夫，辻田淳一郎, 九州大学伊都キャンパスの前方後円墳探査, 文化財と探査, 11, 2, 19-30, 2010.05. |
| 117. | Hideki Mizunaga and Toshiaki Tanaka, Imaging of Geothermal Fluid Flow by Using Fluid Flow Electromagnetic Method, Proceedings of World Geothermal Congress 2009, (CD-ROM), 2010.04. |
| 118. | Keigo Kuroki and Hideki Mizunaga, Three Dimensional FDTD Analysis of Ground Penetrating Radar, Proceedings of International Symposium on Earth Science and Technology 2009, 419-422, 2009.12. |
| 119. | N. M. Saadi, K. Watanabe and H. Mizunaga, Comparison of Remote Sensing Image Processing Methods in Different Geological Environment, Proceedings of the 15th CEReS International Symposium on Remoto Sensing, 2009.12. |
| 120. | Aijiro Shigematsu, Toshiaki Tanaka and Hideki Mizunaga, Development of Small Measurering Equipment for Electromagnetic Method, Proceedings of International Symposium on Earth Science and Technology 2009, 427-429, 2009.12. |
| 121. | Hideki Watanabe and Hideki Mizunaga, Forward and Inverse Modeling of SIP Data for Mineral Discrimination, Proceedings of International Symposium on Earth Science and Technology 2009, 423-426, 2009.12. |
| 122. | 水永秀樹, 九州大学における資源系教育と人材育成, 石油技術協会誌, 第73巻，第5号，378-382, 2008.09. |
| 123. | Tamiki Ueno, Akiko Fujimoto, Kiyohumi Yumoto, Keisuke Ushijima, Hideki Mizunaga and Toshiya Hanada, Measurement of QSAT Residual Magnetism, Memoirs of the Fuculty of Sciences, Kyushu University, Vol.32, N0.1, 7-23, 2008.02. |
| 124. | 田中俊昭，水永秀樹，牛島恵輔, 遺跡の３次元可視化プログラムの開発, 物理探査, 第60号，第3号，235-244, 2007.06. |
| 125. | Hideki Mizunaga, Toshiaki Tanaka, K. Ushijima, N. Ikeda, Fluid-flow monitoring by a 4-D geoelectrical techniques, 19th Symposium on the Application of Geophysics to Engineering and Environmental Problems: Geophysical Applications for Environmental and Engineering Hazzards - Advances and Constraints, SAGEEP 2006 19th Symposium on the Application of Geophysics to Engineering and Environmental Problems, SAGEEP 2006 Geophysical Applications for Environmental and Engineering Hazzards - Advances and Constraints, 2, 1494-1504, 2006.12, An advanced geoelectrical technique for imaging potential fractures has been developed by Engineering Geophysics Laboratory in Kyushu University. The method, Fluid Flow Tomography (FFT), has been applied to monitor fluid flow behaviors in a reservoir during water injection and steam production operations in geothermal areas. Distribution and extension of major fractures can be evaluated by 3-D inversion of induced self potential (SP) anomalies with a function of time and resistivity structures can be determined by 3-D inversion of the charged potential data in a surveyed area. It is concluded that fluid flow behaviors in a reservoir could be continuously traced and visualized as a function of time by the FFT method.. |
| 126. | Keisuke Ushijima, Hideki Mizunaga, Toshiaki Tanaka, Mine and UXO exploration by electrical resistivity measurements, 19th Symposium on the Application of Geophysics to Engineering and Environmental Problems: Geophysical Applications for Environmental and Engineering Hazzards - Advances and Constraints, SAGEEP 2006 19th Symposium on the Application of Geophysics to Engineering and Environmental Problems, SAGEEP 2006 Geophysical Applications for Environmental and Engineering Hazzards - Advances and Constraints, 1615-1623, 2006.12, Mine clearing is an urgent matter to be tackled internationally not only from the humanitarian point of view but also from the viewpoint of reconstruction and economic growth in the area where a cessation of armed conflicts was achieved. Operations are already underway to clear landmines, but currently they rely heavily on human works due to a lack of safer and efficient demining techniques. Various geophysical exploration techniques have been applied to the problem of detecting and mapping underground mines and UXO with practical success. The most productive techniques are magnetic, electromagnetic and Ground Penetrating Radar methods for which the mine target exhibits the greatest physical contrast with the host geological formation. Developments of more sensitive geophysical equipments for detecting mines is required to meet the geophysical conditions of lower contrast with the environment and at the scale of the target. Starting from May 2004, a channel of communication between the Egyptian embassy in Tokyo and the Kyushu University Mine Action Group (QMAG) team on the topics of landmines in Egypt has been established on how to apply geophysical techniques newly developed geophysical techniques in Japan to solve the problem of landmines in Egypt. We arranged a campaign for landmines detection technology in Egypt, conducted by research teams of QMAG of Kyushu University. During the campaign three geophysical techniques, DC resistivity, magnetic and ground penetration radar were tested and evaluated.. |
| 127. | Hideki Mizunaga, Toshiaki Tanaka, Keisuke Ushijima, 3D imaging of archaeological tomb by electrical resistivity techniques, 19th Symposium on the Application of Geophysics to Engineering and Environmental Problems: Geophysical Applications for Environmental and Engineering Hazzards - Advances and Constraints, SAGEEP 2006 19th Symposium on the Application of Geophysics to Engineering and Environmental Problems, SAGEEP 2006: Geophysical Applications for Environmental and Engineering Hazzards - Advances and Constraints, 2, 1374-1377, 2006.12, Several geophysical exploration methods have been applied to the problem of detecting and mapping underground archaeological remains with practical success. The most productive techniques are those for which the archaeological target exhibits the great physical contrast with the surrounding formation. Most widely used in archaeological prospection include Magnetic, Electromagnetic, Ground Penetrating Radar and Electrical Resistivity methods applied at the shallow surface. However, these conventional geophysical measurements for an archaeological prospection has been tried with relatively limited success. Therefore, we have developed an automatic imaging system named as Handy-ARM (Archaeological Resistivity Meter) for an archaeologist based on electrical resistivity techniques.. |
| 128. | 宮本一夫，辻田淳一郎，牛島恵輔，水永秀樹，田中俊昭，黒木貴一, 福岡市西区元岡池ノ浦古墳・峰古墳の墳丘測量調査と電気探査の結果, 九州考古学, 第81号，53-70, 2006.11. |
| 129. | Ho Trong Long, Hideki Mizunaga and Keisuke Ushijima, Borehole-to-surface Electrical Data Interpretation at Takigami Geothermal Field in Kyushu, Japan using Neural Network, SEG Technical Program Expanded Abstructs 2006, 1318-1322, 2006.10. |
| 130. | Supriyanto Suparno, Hideki Mizunaga, Keisuke Ushijima, 3-D MAM inversion in Sibayak geothermal field, Indonesia, Memoirs of the Faculty of Engineering, Kyushu University, 66, 2, 99-113, 2006.08, Sibayak geothermal field is located about 65 km to the southwest of Medan in the North Sumatra Province, Indonesia. Starting from 1998, a small-scale geothermal power plant (2 MWe) has been installed in this area. Since electricity demand increases in the North Sumatra Province, Pertamina Geothermal Energy plans to increase the capacity to 20 MWe. Accordingly, detailed knowledge of the reservoir structure and its extension must be determined for a new production target. The mise-a-la-masse (MAM) surveys were carried out in this field using the exploration well SBY-1 and the production well SBY-4 to delineate a new production target for further field development. A conventional one-dimensional MAM data processing has been done to obtain lateral variation of subsurface resistivity. However, the result is not satisfied to image real condition of the geology on the subsurface. Therefore, we carried out an advanced 3-D MAM inversion based on the smoothness-constrained least-squares method using a homogeneous earth as the simplest assumption of the starting model. Interpretation of the 3-D MAM model was done by combining the results with previous geo-electrical data and borehole information to image a promising reservoir zone. The resistivity model obtained from this study is characterized by a very low resistivity cap rock beneath a resistive layer and rather high resistivity layer of the reservoir. The very low resistivity layer is due to clay minerals such as montmorillonite. This interpretation result of the 3-D MAM model indicates that reservoir zones trend to the north-northeast direction of the study area, between Mt. Sibayak and Mt. Pratektekan, and shows a good correlation with the formation temperature and the lost circulation zone. This geophysical information is useful for the task of selecting sites for the promising zone in the Sibayak geothermal field.. |
| 131. | Hideki Mizunaga, Toshiaki Tanaka and Keisuke Ushijima, 3D Imaging of Archaeological Tomb by Electrical resistivity Techniques, Proceedings of Symposium in the Application of Geophysics to Engineering and Environmental Problems 2006, 2006.03. |
| 132. | Hideki Mizunaga, Toshiaki Tanaka and Keisuke Ushijima, Fluid-Flow Monitoring by a 4-D Geoelectrical Techniques, Proceedings of Symposium in the Application of Geophysics to Engineering and Environmental Problems 2006, 2006.03. |
| 133. | Keisuke Ushijima, Hideki Mizunaga and Toshiaki Tanaka, Mine and UXO exploration by Electrical Resistivity Measurements, Proceedings of Symposium in the Application of Geophysics to Engineering and Environmental Problems 2006, 2006.03. |
| 134. | Ho Trong Long, Hideki Mizunaga, Keisuke Ushijima, Borehole-to-surface electrical data interpretation at Takigami geothermal field in Kyushu, Japan using neural network, SEG Technical Program Expanded Abstracts, 10.1190/1.2369763, 25, 1, 1318-1322, 2006.01, [URL], This paper deals with the application of neural network technique for the three-dimension interpretation of mise-à-la-masse data from the Takigami geothermal field in Kyushu, which is one of the most active geothermal area in Japan. To understand the structure of the geothermal field, a 4-layers neural network had been developed. The training algorithm for the network is back-propagation with five paradigms, e.g. on-line back-propagation, batch back-propagation, delta-bar-delta, resilient propagation (RPROP) and quick propagation, were applied to find out the most efficient one. The network was trained with 3-D mise-à-la-masse simulation data set, including 864 cases of a single anomalous resistivity block of 10 Ohm.m moving in the model mesh with background resistivity of 100 Ohm.m. To generate the training data set, a high accuracy algorithm for 3-D numerical simulation, based on finite difference method and the algorithm of the singularity removal, was used. The trained network was tested by a synthetic data and then applied for the real field data set of the study area. The obtained results are remarkably correlated with the other available data from the field such as previous geoelectrical data, formation temperatures, lost circulation zones, hence, promising zones for production or re-injection can be indicated quickly at site of Takigami geothermal field.. |
| 135. | Supriyanto Suparno, Hideki Mizunaga, Keisuke Ushijima, MAM and MT Exploration in the Sibayak Geothermal Field, Proceedings of 2005 SEG Annual Meeting, CD-ROM, 2005.11. |
| 136. | 宮本一夫，辻田淳一郎，牛島恵輔，水永秀樹，田中俊昭，今井隆博, 福岡市西区元岡・塩除古墳の墳丘測量調査と電気探査の結果, 九州考古学, 第80号，69-83, 2005.11. |
| 137. | Hideki Hatanaka, Tetsuo Aono, Hideki Mizunaga, Keisuke Ushijima, Three-Dimensional Modeling and Inversion of the Mise-a-la-masse Data Using a Steel-Casing Borehole, Proceedings of World Geothermal Congress 2005, CD-ROM, 2005.04. |
| 138. | Hideki Mizunaga, Tetsuo Aono, Keisuke Ushijima, Imaging Geothermal Reservoir by a 4-D Geoelectrical Method, Proceedings of World Geothermal Congress 2005, CD-ROM, 2005.04. |
| 139. | Keisuke Ushijima, Enjang Jaenal Mustopa, Hisashi Jotaki, Hideki Mizunaga, Magnetotelluric Sounding in the Takigami Geothermal Area in Japan, Proceedings of World Geothermal Congress 2005, CD-ROM, 2005.04. |
| 140. | 庄井義和，廣岡義幸，水永秀樹，牛島恵輔, 弾性波トモグラフィを用いた岩原双子塚古墳の調査, 文化財と探査, 15-20, 2005.01. |
| 141. | Koichi Tagomori, Enjang Mustopa, Hisashi Jotaki, Hideki Mizunaga, Keisuke Ushijima, Imaging geothermal fractures by CSAMT method at Takigami area in Japan, Proceedings of Thirtieth Workshop on Gepthermal Reservoir Engineering, Stanford University, SGP-TR-176, 2005.01. |
| 142. | Supriyanto Suparno, Hideki Mizunaga, Keisuke Ushijima, Yunus Daud, MAM and MT explorations in the Sibayak geothermal field, 75th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2005 Society of Exploration Geophysicists - 75th SEG International Exposition and Annual Meeting, SEG 2005, 1026-1029, 2005.01, Deep Magneto-Telluric (MT) and Mise-a-la-Masse (MAM) geophysical imaging methods provide valuable information on fundamental processes within a geothermal field. However, because of an inherent non-uniqueness problem during data processing, interpretation of each individual method sometime has no good agreement with a real geological structure in a geothermal field. As a result, the naive application of the methodology can lead to erroneous results. Therefore, to convince the interpretation result by decreasing non-uniqueness possibility, we have performed integrated inversion of MT and MAM data observed in the Sibayak geothermal field, Indonesia. The results were then correlated to borehole data. The final interpretation show a dome-shape structure of the low resistivity, indicating an up-flow zone around fractures in the southeast direction of the Sibayak Mountain. This geophysical information is useful for the task of selecting sites for the promising zone in the Sibayak geothermal field.. |
| 143. | Keisuke Ushijima, Hideki Mizunaga, Toshiaki Tanaka, Kazuo Miyamoto, 3D imaging archaeological tomb by vertical electric soundings, 18th Symposium on the Application of Geophysics to Engineering and Environmental Problems: Geophysical Solutions for Today's Challenges, SAGEEP 2005 18th Symposium on the Application of Geophysics to Engineering and Environmental Problems, SAGEEP 2005: Geophysical Solutions for Today's Challenges, 2, 856-861, 2005, Application of geophysical methods has increased to investigate near-surface horizons of interests in related to environmental and engineering geophysics because geophysical methods are cost-effective and large areas can be quickly surveyed at relatively low cost without borings and trench excavations. The most productive geophysical methods are Ground Penetrating Radar and Electrical Resistivity methods for which the target exhibits the greatest physical contrast with respect to the surrounding formations. However, the geoelectrical geophysics is very difficult to predict the sub-surface using conventional techniques because of the shortage of the resolution. These geophysical techniques have required upgrading of data acquisition accuracy of the methods using a multichannel resistivity tool such as Handy Archaeological Resistivity Meter developed by the joint research of Kyushu University and OYO Corporation in Japan. Geoelectrical methods have the economic advantages to solve various archaeological problems. However, there was no successful 3D computer program required for interpreting observed apparent resistivity data. In the present paper, a robust 3D computer program was developed and applied to archaeological prospection. Results of 3D inversion of VES data are compared with the results of GPR method and evaluated with archaeologists of Archaeological Society of Japan.. |
| 144. | Ahmed Khalil, Hideki Mizunaga and Keisuke Ushijima, Deep geoelectric investigation over thrust area in Japan, Proceedings of the 7th SEGJ International Symposium, 296-301, 2004.11. |
| 145. | Supriyanto Suparno, Yunus Daud, Hideki Mizunaga and Keisuke Ushijima, Imaging fracture extentions of the Sibayak geothermal field (Indonesia) using 3-D inversion of the borehole^to-surface resistivity data, Proceedings of the 7th SEGJ International Symposium, 61-65, 2004.11. |
| 146. | Gad El-Qady, Kei Nananishi, Hideki Mizunaga and Keisuke Ushijima, Prototype TEM survey for imaging subsurface contaminates, Proceedings of the 7th SEGJ International Symposium, 487-491, 2004.11. |
| 147. | 水永秀樹，青野哲雄，田中俊昭，佐々木純一，牛島恵輔, 流体流動電位法による大沼地熱地帯の貯留層モニタリング, 日本地熱学会誌, 第26巻，第3号，251-271, 2004.07. |
| 148. | Hideki Mizunaga, Toshiaki Tanaka, Keisuke Ushijima, Tetsuo Aono, Junichi Sasaki, Reservoir Monitoring of the Onuma Geothermal Field Using Fluid Flow Tomography, Journal of the Geothermal Research Society of Japan, 10.11367/grsj1979.26.251, 26, 3, 251-271, 2004.07, [URL], Fluid Flow Tomography (FFT) method is an improved mise-à-la-masse method, which is used as a reservoir monitoring method. This method is a 4-Dimensional (4-D) electrical method in order to visualize the transient subsurface fluid flow by measuring charged electric potentials due to subsurface resistivity and streaming potentials caused by subsurface fluid flow. This method is utilized to monitor the fluid flow during hydraulic fracturing of Hot Dry Rock project and periodical overhaul of geothermal power plant. This method is also used to monitor the flow of heavy crude oil in oil sand formation during thermal Enhanced Oil Recovery (EOR). The observed data of FFT method can be separated into charged electric potentials derived from subsurface resistivity structure and streaming potentials due to a permeable fluid flow. In this paper we describe the algorithm of three-dimensional resistivity inversion and three-dimensional probability tomography of self-potential data. A case study of FFT method was carried out in the Onuma geothermal area. As the results of 3-D analysis of resistivity data, distinguished low resistivity anomalies were detected and resistivity discontinuities where marked with resistivity changes were detected. As the results of 3-D analysis of self-potential data, the main production zone and reinjection zone were delineated from Charge Occurrence Probability (COP) distribution. We believe that the FFT method is a useful tool to monitor the dynamic change of fluid flow behavior in a reservoir during production and reinjection operations.. |
| 149. | Keisuke USHIJIMA, Hideki MIZUNAGA, Toshiaki TANAKA, Imaging of Keyhole Tomb, Electrical Prospecting, Proceedings of the Annual General Assembly and the 6th Special Symposium of Korean Society of Exploration Geophysicists, 2004.06. |
| 150. | Keisuke Ushijima, Hideki Mizunaga, Toshiaki Tanaka, Imaging of Keyhole Tomb, Electrical Prospecting, Proceedings of the Annual General Assembly and the 6th Special Symposium of Korean Society of Exploration Geopgysicists, 3-7, 2004.06. |
| 151. | 牛島恵輔，水永秀樹，青野哲雄, 大宰府水城跡の遺跡探査, 文化財と探査, VOL.5, No.1, 2-8, 2004.06. |
| 152. | 多和田真丈, 波多江亮平, 水永 秀樹, 牛島 惠輔, GPR探査データを用いた3次元イメージング, 電気情報通信学会技術研究報告 宇宙・航行エレクトロニクス, 103, 300, 21-23, 2003.09. |
| 153. | 水永秀樹，青野哲雄，牛島恵輔, 傾斜坑井を利用した流電電位法の３次元インバージョン, 物理探査, 第56巻，第4号，209-218, 2003.01. |
| 154. | Enjang Jaenal Mustopa, Hisashi Jotaki, Hideki Mizunaga, Keisuke Ushijima, Magnetotelluric exploration of geothermal resources at Takigami area in Japan, Transactions of Geothermal Resource Council, 27, 245-248, 2003.01, A magnetotelluric (MT) survey has been carried out in Takigami geothermal area to determine resistivity structures and the locations of electrical discontinuities that may reflect a possible fault or fracture correlating with promising geothermal reservoir. The MT measurements have been conducted with irregular grid stations covering the Takigami area. The two-dimensional (2-D) inversion results of the MT data show that the resistivity structures in Takigami area are composed mainly of three layers, that is, high resistivity in the first layer overlying low resistivity in the second layer and resistive electrical basement in the third layer. The results are also in a good agreement with electrical resistivity logs, temperature distribution and lost circulation zone during the course of drilling. It is revealed from the interpretation of MT data that the geothermal reservoir of Takigami field is located at two different depths separated by Noine fault zone, which divides the subsurface of the area into eastern and western parts according to the characteristics of resistivity, permeability, temperature and depth of reservoir. The reservoir in the east of Noine fault zone is shallower than that in the west.. |
| 155. | Tetsuo Aono, Hideki Mizunaga and Keisuke Ushijima, Direct Imaging Fractures by a 4-D Geoelectrical Technique at Sumikawa Geothermal Field, Japan, Proceedings of Twenty-Seventh Workshop on Geothermal Reservoir Engineering, 2002.01. |
| 156. | G. El-Quady, H. Mizunaga, K. Ushijima, Comparative study of resistivity inversion at hamam faraun area, Egypt, Memoirs of the Graduate School of Engineering, Kyushu University, 60, 3, 117-128, 2000.12, DC resistivity method is commonly used for acquiring subsurface resistivity data in environmental and engineering investigations. However, its interpretation is hampered by a variety of factors of which the non-linear nature of the process and bias effects on the data; mainly due to the noise; are the most problem, which limit the model resolution to a large extent. The ability to invert resistivity data successfully depends on many factors such as the uniqueness of the model as well as the robustness of the inversion algorithm. Hereafter we are investigating this problem using three different 1-Diversion algorithms. The three algorithms have been applied to a numerical model of 4 layers to determine the optimum solution produced by each of them. A random noise of 5, 10 and 20 percents has been added to the model in a forward step to determine the most stable, robustness algorithm. Those algorithms have been applied to the field data set measured at Hamam Faraum hot spring area, Egypt, aiming to make a refinement to the previous 1-D inversion done before for the same data set (E1-Qady et. al, 1998). We could conclude that the algorithm of Meju, (1992), is the most effective one in this study. The resulted 1-D geoelectrical cross section could elucidate the subsurface structure and explain the origin of the hot water in the area.. |
| 157. | Toshiaki TANAKA, Ryuichi ITOI, Michihiro FUKUDA, Hideki MIZUNAGA, Keisuke USHIJIMA, An analysis Method of Fluid Flow Monitoring Using a Genetic Algorithm, Geothermal Resources Council Transactions, 24, 631-635, 2000.09. |
| 158. | Ahed SALEM, Keisuke USHIJIMA, A. ELSIRAFI, Hideki MIZUNAGA, Spectral Analysis of Aeromagnetic Data for Geothermal Reconnaissance of Quseir Area, Northern Red Sea, Egypt, Proceedings of World Geothermal Congress 2000, Kyushu-Tohoku, Japan, 1669-1674, 2000.05. |
| 159. | Prihadi SUMINTADIREJA, Sayogi SUDARMAN, Hideki MIZUNAGA, Keisuke USHIJIMA, Mise-a-la-masse and Gravity Data Surveys at the Kamojang Geothermal Field, Proceedings of World Geothermal Congress 2000, Kyushu-Tohoku, Japan, 1777-1784, 2000.05. |
| 160. | Keisuke USHIJIMA, Hideki MIZUNAGA, Toshiaki TANAKA, Kazuo MIYAMOTO, 3D Imaging Archaeological Tomb by Vertical Electric Soundings, Proceedings of Symposium on the Application of Geophysics to Engineering and Environmental Problems 2005, 856-861, 2000.04. |
| 161. | Gad El-Qady, Hideki Mizunaga and Keisuke Ushijima, Comparative study of resistivity inversion of Haman Faraun area, Egypt, Memoirs of the Faculty of Engineering, Kyushu University, Vol.60, No.3, 117-128, 2000.03. |
| 162. | Keisuke Ushijima, Hideki Mizunaga, Toshiaki Tanaka, Reservoir monitoring by a 4-D electrical technique, The Leading Edge, 10.1190/1.1438242, 18, 12, 1422-1424, 1999.12, [URL], A multichannel geoelectrical system and software for data acquisition, processing and interpretation was developed. The method, called fluid-flow tomography (FFT), was used for direct imaging of fractures and an extension of geothermal reservoirs, and to monitor an oil reservoir during thermally enhanced oil recovery. The fluid-flow behavior in the subsurface can be monitored and visualized by the technique, providing time-series data of charged potentials and self-potentials, fluid-flow fronts visualizations and quantifications, symmetric anomaly due to anisotropic permeability of the formation, and 3D fractures distribution.. |
| 163. | Li JISONG, 水永秀樹, 牛島 惠輔, ニューラルネットワークを用いた流電電位法データの解釈, 物理探査, 52, 1, 43-53, 1999.02. |
| 164. | Hideki Mizunaga, Ki Ha Lee and Hee Joon Kim, Three-dimensional electromagnetic modeling in the Laplace domain, Ernest Orlando Lawrence National Laboratory Technical Report, LBNL-42677, 1999.01. |
| 165. | 牛島恵輔，水永秀樹，田中俊昭，玉川哲也，増田一夫, 流体流動電位法による石油強制回収のモニタリング, 物理探査, 第51巻，第6号，659-675, 1998.01. |
| 166. | Keisuke USHIJIMA, Hideki MIZUNAGA, Toshiaki TANAKA, Kazuo MASUDA, Fluid Flow Monitoring of EOR Process by Electrical Prospecting, SEG Technical Program Expanded Abstructs 1997, 651-654, 1997.11. |
| 167. | Li Jisong, Hideki MIZUNAGA, Keisuke USHIJIMA, Interpretation of Mise-a-la-masse Method Data Using Neural Network, International Symposium on Engineering and Environmental Geophysics 1997, 1997.10. |
| 168. | Hideki MIZUNAGA, Keisuke USHIJIMA, Chika SAKAMOTO, 3D Imaging of Monumental Tombs Buried in Keyhole-shaped Tumuli by Electrical Prospecting, Second International Conference on Archaeological Prospection 1997, 1997.09. |
| 169. | 水永秀樹，牛島恵輔, 電気探査法による遺跡の3次元イメージング, 重点領域研究「遺跡探査」第5回研究成果検討会議論文集, 223-234, 1997.02. |
| 170. | 水永秀樹，橋本幸治，田中俊昭，牛島恵輔, 多層構造中の電流源による理論電位の計算, 物理探査, 第50巻，第1号，29-37, 1997.01. |
| 171. | 橋本幸治，田籠功一，田中俊昭，水永秀樹，牛島恵輔, 電気探査法によるフラクチャー探査 －SPデータの3次元解析－, 九大地熱研究報告, 第5号，121-133, 1996.11. |
| 172. | 増田一夫，玉川哲也，田中俊昭，水永秀樹，牛島恵輔, 電気探査法による石油強制回収法のモニタリング －自然電位データの解析－, 九大地熱研究報告, 第5号，106-120, 1996.11. |
| 173. | 水永秀樹，牛島恵輔, 電気探査法による遺跡のイメージング, 重点領域研究「遺跡探査」第4回研究成果検討会議論文集, 231-257, 1996.02. |
| 174. | Hideki Mizunaga, Toshiaki Tanaka, Hideshi Kaieda, Keisuke Ushijima, Fluid flow monitoring system of a geothermal reservoir by electrical prospecting, Memoirs of the Kyushu University, Faculty of Engineering, 55, 4, 505-512, 1995.12, An advanced geophysical technique for reservoir monitoring by electrical prospecting has been developed by the joint research of Kyushu University and CRIEPI work in related to fracture evaluation at the Hot Dry Rock Geothermal Power Project in the Ogachi area. The Fluid Flow Tomography survey method utilizes a casing pipe itself as a charged current electrode similar to the mise-a-la-masse method. The method has been applied to monitor fluid-flow behaviors during massive hydraulic fracturing operations and fluid-circulation experiments from injection to production boreholes. In the automatic recording system controlled by a personal computer charged potentials (mV/A) and spontaneous potentials (mV) can be simultaneously measured as a function of time at multiple stations (120ch) surrounding an operating borehole. Fluid-flow behavior in the subsurface could be visualized as a function of time by using contour maps of residual potentials from SP data and relative changes of apparent resistivity due to dynamic reservoir stimulations.. |
| 175. | Hideshi KAIEDA, Yasuhiro Fujimitsu, Takeshi YAMAMOTO, Hideki MIZUNAGA, Keisuke USHIJIMA, Shunji SASAKI, AE and Mise-a-la-masse Measurements during a 22-days Water Circulation Test at Ogachi HDR Site, Japan, Proceedings of the World Geothermal Congress, 1995, 2695-2700, 1995.05. |
| 176. | 水永秀樹，牛島恵輔, 遺跡探査のための電気探査システム開発, 重点領域研究「遺跡探査」第3回研究成果検討会議論文集, 187-194, 1995.02. |
| 177. | Hideki Mizunaga, Toshiaki Tanaka, Hideshi Kaieda and Keisuke Ushijima, Fluid flow monitoring system of a geothermal reservoir by electrical prospecting, Memoirs of the Faculty of Engineering, Kyushu University, Vol.55, No.4, 505-512, 1995.01. |
| 178. | 牛島恵輔，水永秀樹, 地下空洞のリアルタイム探査法のシステム開発, 重点領域研究「遺跡探査」第2回研究成果検討会議論文集, 86-92, 1994.02. |
| 179. | 牛島恵輔，水永秀樹, 地下空洞のリアルタイム探査法のシステム開発, 重点領域研究「遺跡探査」第1回研究成果検討会議論文集, 59-64, 1993.02. |
| 180. | Hideshi Kaieda, Toshiaki Tanaka, Hideki Mizunaga, Keisuke Ushijima, Fluid flow monitoring by vertical electric profiling method in Ogachi HDR site, Akita prefecture, Japan, 1992 Annual Meeting of the Geothermal Resources Council Transactions - Geothermal Resources Council, 16, 497-499, 1992.12, Hydraulic fracturing experiments for making a man-made reservoir have been conducted on HDR project by CRIEPI since 1986. The Vertical Electric Profiling (VEP, hole-to-surface) method of the geotomography has been applied to monitor fluid-flow behaviors during massive hydraulic fracturing operations. Self potentials (streaming potentials) and charged potentials (apparent resistivities) were continuously observed at multiple stations on the ground surface before and during pumping operations for estimating fluid-flow front and fracture extents. The injected fluid-flow was continuously imaged as a function of time with a personal computer on the Hot Dry Rock site.. |
| 181. | Keisuke Ushijima, Shigetsugu Furuya, Hideki Mizunaga, Toshiro Motomatsu, Fluid flow monitoring by vertical electric profiling survey in takigami geothermal field, middle Kyushu, Japan, 1992 Annual Meeting of the Geothermal Resources Council Transactions - Geothermal Resources Council, 16, 323-328, 1992.12, The Vertical Electrical Profiling (VEP) surveys were carried out for the direct imaging of fractures in a northern reinjection area using TT-10 reinjection well and in the southern production area using TT-14 and TT-13 production wells in the Takigami geothermal field, Kyushu, Japan. The injection/production fluid-flows were continuously monitored with multiple potential electrodes on the ground surface surrounding the well. The potential data are measured with every 2 sec intervals by the digital recording system controlled by a personal computer on the site. The distribution of fractures estimated from the detected potentials show good agreements with the geometry of major fractures determined by the previous VEP (hole-to-surface) surveys in 1984 and the modern magneto-telluric survey in 1987.. |
| 182. | K.Ushijima ,H. Mizunaga, S. Furuya and T. Motomatsu, Flluid Flow Tomography Survey in Takigami Geothermal Field, Geotomography Vol.2, 247-259, 1992.11. |
| 183. | K.Ushijima ,H. Mizunaga, Y. Tamura and Y. Ookouchi, Vertical Electric Profiling Survey in KItanigoro Area, Geotomography Vol.2, 261-270, 1992.11. |
| 184. | H. Kaieda, T. Tanaka, H. Mizunaga and K. Ushijima, Fluid flow monitoring by vertical electric profiling method in Ogachi HDR site, Akita prefecture, Japan, Transactions of Geothermal Resource Council, Vol.16, 497-499, 1992.10. |
| 185. | K. Ushijima, S. Furuya, H. Mizunaga and T. Motomatsu, Fluid flow monitoring by vertical electric profiling survey in Takigami geothermal field, middle Kyushu, Japan, Transactions of Geothermal Resource Council, Vol.16, 323-328, 1992.10. |
| 186. | 牛島恵輔，水永秀樹，海江田秀志，堀義直, VEP法電気探査による地下亀裂面の評価, 日本地熱学会誌, 第14巻，第1号，13-28, 1992.01. |
| 187. | Keisuke Ushijima, Hideshi Kaieda, Hideki Mizunaga, Yoshinao Hori, Fracture Evaluation by Vertical Electric Profiling, journal of the geothermal research society of japan, 10.11367/grsj1979.14.13, 14, 1, 13-28, 1992.01, [URL], For Hot Dry Rock (HDR) geothermal energy development, it is necessary to establish techniques for creating artificial fractures and for evaluating a man-made circulation system as geothermal reservoirs. In this study, we have developed the Fluid Flow Tomography (FFT) technique using the Vertical Electric Profiling (VEP/hole-to-surface) method in which a casing pipe of fracturing well can be used for a current electrode. The fluid flow behavior was continuously detected and monitored with 30 stations on the ground surface during massive hydraulic fracturing operations. The VEP method provides lateral distribution of major fractures with time, while the crosshole (hole-to-hole) survey gives informations on fracture depths connected among the injection and production wells. Therefore, we can image the fluid front with time variations and major fractures in three-dimentions by the joint use of VEP (hole-to-surface) and crosshole (hole-to-hole) surveys on the HDR project.. |
| 188. | K. Ushijima, Hideki Mizunaga, Hideo Mori, A. Hattori, T. Tajima, Fluid flow tomography of reinjection well by the vertical electric profiling method in Kazuno area, Akita prefecture, Japan, 1991 Annual Meeting of the Geothermal Resources Council Transactions - Geothermal Resources Council, 297-299, 1991.12, The Vertical Electric Profiling (VEP) methods were carried out for the exploration of fractures for the reinjection purposes in Kazuno area. The first field survey was conducted in 1985 by using a casing pipe of K-1 well and the drill site of K-5 was determined from the interpreted results. The K-5 reinjection well have met a good lost circulation zone of 135 t/h at the depth of 684 m. The second VEP survey was conducted in 1990 by using a casing pipe of K-5 well before and during the injection operations of the separated hotwater. The injected fluid was continuously monitored with 30 stations surrounding the well by the digital recording system controlled by a personal computer on the site. The distribution of fractures estimated from the detected flow paths show good agreements with the geometry of the major fractures obtained by the borehole imaging data by Schlumberger Wireline Service Inc.,.. |
| 189. | Keisuke USHIJIMA, Hideki MIZUNAGA, Kiyoshi KAWASAKI, Masahiro KONNO, Vertical Electric Profiling Exploration in the Hishikari Gold Mine, Proceedings of SEG 61st Annual International Meeting, 453-455, 1991.11. |
| 190. | Keisuke USHIJIMA, Hideki MIZUNAGA, H. Mori, Asahi HATTORI, T. TAJIMA, Fluid flow tomography of reinjection well by the vertical electric profiling method in Kazuno area, Akita Prefecture, Japan, Geothermal Resources Council TRANSACTIONS, Vol.15, 297-299, 1991.10. |
| 191. | 水永秀樹，牛島恵輔, 流電電位法の３次元モデリング, 物理探査, 第44巻，第4号，215-226, 1991.01. |
| 192. | K.Ushijima ,H. Mizunaga and H. Kaieda, Flluid Flow Monitoring by Vertical Electric Profiling, Geotomography Vol.1, 271-279, 1990.12. |
| 193. | K.Ushijima ,H. Mizunaga and W. H. Pelton, Geothermal Exploration in Difficult Areas, Proceedings of SEG 60th Annual International Meeting, 259-261, 1990.09. |
| 194. | K.Ushijima and H. Mizunaga, Detection of Cavities by the Mise-a-la-masse and Pole-dipole Resistivity surveys, Proceedings of MMIJ/IMM Joint Symposium in Kyoto, Japan, 125-128, 1989.10. |
| 195. | 牛島恵輔，水永秀樹，永浜伸也, ポールダイポール法による地下空洞探査, 物理探査, 第42巻，第5号，324-334, 1989.01. |
| 196. | K. Ushijima, Hideki Mizunaga, Detection of cavities by the mise-a-la-masse and pole-dipole resistivity surveys, Unknown Journal, 125-128, 1989.01, The underground detection of cavities is one of the most important problems for mining engineers. The mise-a-la-masse (charged potential) and pole-dipole resistivity surveys are investigated for locating natural and artificial cavities. These new geophysical methods have better resolution on the exploration targets than the conventional electrical resistivity methods. It is confirmed that the mise-a-la masse resistivity measurements are very useful for detecting and mapping the lateral changes of the formations such as cavities and fractures. The pole-dipole resistivity method has a good resolution for determining the size and depth of the anomalous body. Therefore, the combined use of these economic geophysical methods provides better resolution of locating the target of interest in three-dimensions. -Authors. |
| 197. | K.Ushijima and H. Mizunaga, Numerical Modeling for the Mise-a-la-masse Method, Proceedings of International Symposium on Geothermal Energy, 547-550, 1988.09. |
| 198. | 水永秀樹，牛島恵輔, 流電電位法のデータ処理に関する研究, 物理探査, 第41巻，第5号，345-359, 1988.01. |
| 199. | 牛島恵輔，水永秀樹，加藤昭彦, パソコンによる電気探査データの解析, 物理探査, 第40巻，第6号，423-435, 1987.01. |
| 200. | 田籠功一，牛島恵輔，水永秀樹，乗富一雄, 八丁原地熱地帯の調査井HT-8を利用した鉱体流電法による地熱資源探査, 日本地熱学会誌, 第8巻，第4号，331-346, 1986.10. |
| 201. | 水永秀樹，牛島恵輔，乗富一雄，田籠功一，本田満, 鉱体流電法による探査データのモデル解析, 日本地熱学会誌, 第8巻，第4号，361-378, 1986.10. |
| 202. | 牛島恵輔，水永秀樹，乗富一雄，田籠功一，服部旭, 鉱体流電法による地熱貯留層の探査, 地熱, 第23巻，第3号，206-223, 1986.09. |
| 203. | Hideki Mizunaga, Keisuke Ushijima, Kazuo Noritomi, Koichi Tagomori, Mitsuru Honda, Numerical Modeling for the Mise-Ä-la-masse Survey, Journal of the Geothermal Research Society of Japan, 10.11367/grsj1979.8.361, 8, 4, 361-377, 1986, [URL], In March and April 1984, West Japan Engineering Consultants (WJEC) was contracted by Kyushu Elec-tric Power Company (KEPCO) to conduct field survey for a proposed mise-a-la-masse method. The survey was carried out using an exploratory well HT-8 located in the vicinity of the present production area of the Hatchobaru geothermal field in north central Kyushu, Japan. The apparent resistivity and potential maps derived from the data processing clearly indicated several promising zones of low resistivity including the present production zones where the almost all of productive wells located inside and indicated two-dimensional structure across the strike of the Komatsuike sub-fault. Two-dimensional mise-ä-la-masse modeling of surface potential and apparent resistivity profiles has been developed over various bodies for multiple electrode configurations. The surface responses are obtained by the finite difference method for a horizontal body with the contrast in conductivity between the body and subsurface is 10:1, but different locations of a line sources of current electrode. A two-dimensional model has been derived to simulate results as close to observed field data across the present production zone as possible. The similarities between the observed data and the best fitted model are striking, in particular of the data for the surface potential distribution.. |
| 204. | Koichi Tagomori, Keisuke Ushuima, Hideki Mizunaga, Kazuo Noritomi, The Mise-á-la-masse Survey of Geothermal Resources using HT-8 Well in Hatchobaru Geothermal Area, Journal of the Geothermal Research Society of Japan, 10.11367/grsj1979.8.331, 8, 4, 331-345, 1986, [URL], The mise-a-la-masse survey has been used mostly for the ore prospecting in the mining industry. In 1984, the mise-á-la-masse survey was carried out using a casing pipe of HT-8 well in Hatchobaru geothermal area in order to map geothermal reservoirs. The measurement gave rise to the sharply contoured residual anomalies due to high contrasts of resistivities among the geothermal fluid, hydrothermaly altered zones and surrounding formations. The residual maps derived from the data processing clearly indicated several promissing low resistivity zones including the present production zone where the almost all of productive wells located inside. It was confirmed that the strike of faults which regulated the upstream of the geothermal fluid and lateral distribution of geothermal reservoirs showed a good correlation with those determined by the Schlumberger resistivity and magnetotelluric surveys in this area.. |
本データベースの内容を無断転載することを禁止します。
九大関連コンテンツ
QIR 九州大学学術情報リポジトリ システム情報科学研究院
工学部・工学研究院
- A Proposal on Road Evaluation Method Considering the Effect of Shortening Emergency Medical ...
- Study on Station Square Development at Hub Stations
- Feasibility and Quantification Analysis of Floodwater Utilization
- The Critical Behavior of 1-dimensional Spin System with Infinite Long-range Interaction ...
- A Comparison of Analysis Methods for Estimating Directional Wave Spectrum from HF Ocean Radar