Kyushu University Academic Staff Educational and Research Activities Database
List of Presentations
Toshiaki Tanaka Last modified date:2023.11.22

Assistant Professor / Exploration Geophysics / Department of Earth Resources Engineering / Faculty of Engineering


Presentations
1. 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, International Symposium on Earth Science and Technology 2021, 2021.11.
2. Chuichi Inoue, Mizunaga Hideki, Toshiaki Tanaka, A study on visualization of underground roots using electrical techniques, International Symposium on Earth Science and Technology 2021, 2021.11.
3. Kazuto Inoue, Hao Chen, Toshiaki Tanaka, Hideki Mizunaga, Example of application of a new MT time series processing method, International Symposium on Earth Science and Technology 2021, 2021.11.
4. Hao Chen, Hideki Mizunaga, Toshiaki Tanaka, Gang Wang, Comparing the bound influence and maximum likelihood magnetotelluric response function estimator, 物理探査学会第144回学術講演会, 2021.06.
5. Casula Mel Anthony Asis, Hideki Mizunaga, Toshiaki Tanaka, Subsurface Characterization using Geophysical and Hydrochemical Data: An Application to Groundwater Resources Management in Pampanga, Philippines, International Symposium on Earth Science and Technology 2020, 2020.11.
6. 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, International Symposium on Earth Science and Technology 2020, 2020.11.
7. Yushin Higashi, Toshiaki Tanaka, Hideki Mizunaga, An Experimental Study on Quad-Loop EM Method, International Symposium on Earth Science and Technology 2020, 2020.11.
8. Soichiro Hashimoto, Toshiaki Tanaka, Hideki Mizunaga, A New Technique of Resistivity Measurement for Drilling Cores, International Symposium on Earth Science and Technology 2020, 2020.11.
9. Abebayehu Andarge Mengiste, Hideki Mizunaga, Toshiaki Tanaka, 1-D and 2-D Inversions of Magnetotelluric Data in Butajira Geothermal Field, Ethiopia, International Symposium on Earth Science and Technology 2020, 2020.11.
10. Hao Chen, Hideki Mizunaga, Toshiaki Tanaka, Robust impedance estimator based on Hilbert-Huang transformation to time-series magnetotelluric data, 物理探査学会第143回学術講演会, 2020.11.
11. Yosuke Kiyomoto, Hideki Mizunaga, Toshiaki Tanaka, Development of Magnetotelluric 1-D Sparse Inversion, International Symposium on Earth Science and Technology 2019, 2019.12.
12. Hao Chen, Hideki Mizunaga, Toshiaki Tanaka, The research on the application of Hilbert-Huang Transformation to time series magnetotelluric data, International Symposium on Earth Science and Technology 2019, 2019.12.
13. Soichiro Hashimoto, Toshiaki Tanaka, Hideki Mizunaga, Resistivity measurement technique using capacitor electrodes, International Symposium on Earth Science and Technology 2019, 2019.12.
14. Yusuke EGUSA, Hideki MIZUNAGA, Toshiaki TANAKA, 3-D Simulation of Square Array Resistivity Method Considering the Effects of Mixture of Soil-Cement, International Symposium on Earth Science and Technology 2018, 2018.11.
15. Kazuki YAMADA, Hideki MIZUNAGA, Toshiaki TANAKA, Spectrum Analysis of Gamma Ray Data to Extract Spectrum Peaks, International Symposium on Earth Science and Technology 2018, 2018.11.
16. Shokai IWAMOTO, Hideki MIZUNAGA, Toshiaki TANAKA, GPR Survey at Kuratsukasa Erea in Dazaifu Historical Site, Fukuoka Prefecture, Japan, International Symposium on Earth Science and Technology 2018, 2018.11.
17. Hideaki EJIMA, Hideki MIZUNAGA, Toshiaki TANAKA, Detection and Classification of Anomalies in GPR B-scan Data, International Symposium on Earth Science and Technology 2018, 2018.11.
18. Gosuke HOSHINO, Hideki MIZUNAGA, Toshiaki TANAKA, Development of a Simulator for 3-D Long-offset TEM Method, International Symposium on Earth Science and Technology 2018, 2018.11.
19. Yosuke KIYOMOTO, Hideki MIZUNAGA, Toshiaki TANAKA, Archaeological Survey for Genko Borui Using Ground Penetrating Radar, International Symposium on Earth Science and Technology 2018, 2018.11.
20. Asuki AIKAWA, Toshiaki TANAKA, Saeid JALILINASRABADY, Ryuichi ITOI, The reproduction of temperature change in production area of Ogiri geothermal field, International Symposium on Earth Science and Technology 2018, 2018.11.
21. Keiji HIRASE, Toshiaki TANAKA, Saeid JALILINASRABADY, Ryuichi ITOI, Automatic Parameter Estimation in Geothermal Reservoir Numerical Simulation, International Symposium on Earth Science and Technology 2018, 2018.11.
22. Shinnosuke ISHIHARA, Toshiaki TANAKA, Hideki MIZUNAGA, Ryuichi ITOI, Junichi TAKAYAMA, Satoru HIGUCHI, Improvement of the numerical model considering Ogiri deep faults No.2 in the Ogiri geothermal field, International Symposium on Earth Science and Technology 2018, 2018.11.
23. Makoto TOYONAGA, Saeid JALILINASRABADY, Toshiaki TANAKA, Ryuichi ITOI, Tracer test simulation considering lower permeability area near injection well, International Symposium on Earth Science and Technology 2018, 2018.11.
24. Takahiro Yoshikawa, Ryuichi Itoi, Toshiaki Tanaka, Derivation of Dissolution Kinetics and Simulation on Silica Scale Removal in a Wellbore, International Symposium on Earth Science and Technology 2017, 2017.11.
25. Takahiro Nagashima, Toshiaki Tanaka, Saeid Jalilinasrabady, Ryuichi Itoi, Junichi Takayama, Evaluation of Fluid Flow Behavior by Two Dimensional Fault Model for the Ogiri Geothermal Area, Japan, International Symposium on Earth Science and Technology 2017, 2017.11.
26. Shinnosuke Ishihara, Toshiaki Tanaka, Saeid Jalilinasrabady, Ryuichi Itoi, Evaluation of Influence of Various Boundary Conditions in Geothermal Reservoir Analysis using TOUGH2, International Symposium on Earth Science and Technology 2017, 2017.11.
27. Naoto Odate, Toshiaki Tanaka, Saeid Jalilinasrabady, Ryuich Itoi, Evaluation of Tracer Response Curves under Different Test Conditions at the Same Hydrogeological Structure, International Symposium on Earth Science and Technology 2017, 2017.11.
28. Kenta Kondo, Ryuichi Itoi, Toshiaki Tanaka, Takahito Mizusawa, Natural State Modeling of Geothermal Reservoir in Sumikawa, Akita Pref, Japan, International Symposium on Earth Science and Technology 2017, 2017.11.
29. Kokichi Suzuki, Toshiaki Tanaka, Ryuichi Itoi, Numerical Analysis of Steam–water Two-phase Flow in Geothermal Well using Drift–flux Model, International Symposium on Earth Science and Technology 2017, 2017.11.
30. Shunichi Okamoto, Toshiaki Tanaka, Hideki Mizunaga, Development of a Measurement Instrument Controlled by PSoC5LP for Fluid Flow Electromagnetic Method, International Symposium on Earth Science and Technology 2017, 2017.11.
31. Gosuke Hoshino, Hideki Mizunaga, Toshiaki Tanaka, Development of a Ray Tracing Program for Seismic Refraction Method, International Symposium on Earth Science and Technology 2017, 2017.11.
32. Ryosuke Nagawa, Hideki Mizunaga, Toshiaki Tanaka, Development of an Inversion Program of Marin TEM using PSO, International Symposium on Earth Science and Technology 2017, 2017.11.
33. Shokai Iwamoto, Hideki Mizunaga, Toshiaki Tanaka, GPR Survey at Kuratsukasa District in Dazaifu Histrical Site, Fukuoka Prefecture, Japan, International Symposium on Earth Science and Technology 2017, 2017.11.
34. Hideaki Ejima, Hideki Mizunaga, Toshiaki Tanaka, Recognition of Buried Objects of GPR using CNN, International Symposium on Earth Science and Technology 2017, 2017.11.
35. Yusuke Egusa, Hideki Mizunaga, Toshiaki Tanaka, Simulation of Square Array Resistivity Method to Detect Subsurface Layer Boundaries, International Symposium on Earth Science and Technology 2017, 2017.11.
36. Kenta KONDO, RYUICHI ITOI, Toshiaki Tanaka, Numerical Simulation of the Sumikawa Geothermal Reservoir, Japan, Using iTOUGH2, 42nd Workshop on Geothermal Reservoir Engineering, Stanford University, 2017.02.
37. Keisuke YAMAMURA, RYUICHI ITOI, Toshiaki Tanaka, Takaichi IWASAKI, Numerical Analysis of Transient Steam-Water Two-Phase Flow in Geothermal Production Wells with Multiple Feed Zones, 42nd Workshop on Geothermal Reservoir Engineering, Stanford University, 2017.02.
38. Keisuke IKEDA, Hideki Mizunaga, Toshiaki Tanaka, GPR Survey at Onigaura Tunnel Tombs and 2-D Simulation, International Symposium on Earth Science and Technology 2016, 2016.12.
39. Shogo HAMADA, Hideki Mizunaga, Toshiaki Tanaka, A Study on Identification of Signal and Noise in Fluid Flow Electromagnetic Method, International Symposium on Earth Science and Technology 2016, 2016.12.
40. Takahiro YOSHIKAWA, Ryuichi ITOI, Toshiaki Tanaka, Dissolution Experiments and Simulation on Silica Scale Removal in Geothermal Reinjection Wellbore, International Symposium on Earth Science and Technology 2016, 2016.12.
41. Kenta KONDO, Ryuichi ITOI, Toshiaki Tanaka, Takaichi IWASAKI, Natural State Modeling of Geothermal Reservoir in Sumikawa, Akita, Japan, International Symposium on Earth Science and Technology 2016, 2016.12.
42. Kohei OTSUKA, Ryuichi ITOI, Toshiaki Tanaka, Yuji Ohya, Saeid JALILINASRABADY, Numerical Modeling of Solar Chimney Power Generation System Using Geothermal Hot Water as a Heat Source, International Symposium on Earth Science and Technology 2016, 2016.12.
43. Shunichi OKAMOTO, Toshiaki Tanaka, Ryuichi ITOI, A Stabilization Technique for Geothermal Reservoir Simulation by TOUGH2 by Way of Coarse Numerical Models, International Symposium on Earth Science and Technology 2016, 2016.12.
44. ADRIANTO, Ryuichi ITOI, Toshiaki Tanaka, Fractal Analysis of Pressure Transient Response in the Matsukawa Geothermal Field, International Symposium on Earth Science and Technology 2016, 2016.12.
45. Kohei OTSUKA, RYUICHI ITOI, Toshiaki Tanaka, Yuji Ohya, Saeid JALILINASRABADY, STUDY ON A SOLAR CHIMNEY POWER GENERATION SYSTEM USING GEOTHERMAL HOT WATER AS A HEAT SOURCE, 38th New Zealand Geothermal Workshop 2016, 2016.11.
46. Keisuke Yamamura, RYUICHI ITOI, Toshiaki Tanaka, Takaichi Iwasaki, NUMERICAL MODEL OF TRANSIENT STEAM-WATER TWO-PHASE FLOW IN GEOTHERMAL PRODUCTION WELLS, 38th New Zealand Geothermal Workshop 2016, 2016.11.
47. Takahiro Yoshikawa, RYUICHI ITOI, Toshiaki Tanaka, DISSOLUTION EXPERIMENTS OF SILICA SCALE AND DERIVATION OF DISSOLUTION KINETICS, 38th New Zealand Geothermal Workshop 2016, 2016.11.
48. Shogo HAMADA, Hideki Mizunaga, Toshiaki Tanaka, Research about Measurement of Marine MT Probe's Posture, International Symposium on Earth Science and Technology 2015, 2015.12.
49. Toshihiro NAKAMURA, Ryuichi ITOI, Toshiaki Tanaka, Masato WATANABE, Daisuke FUKUDA, Kazuto MATSUMOTO, Estimation of Hydrological Structure in the Kakkonda Geothermal Field using Tracer Test Results, International Symposium on Earth Science and Technology 2015, 2015.12.
50. Kohei OTSUKA, Ryuichi ITOI, Toshiaki Tanaka, Improvement in Solar Chimney Power Generation by Using Hot Water as a Heat Source, International Symposium on Earth Science and Technology 2015, 2015.12.
51. Adrianto, RYUICHI ITOI, Toshiaki Tanaka, Modeling of alcohol tracer test in vapor-dominated geothermal reservoir, 37th New Zealand Geothermal Workshop 2015, 2015.11.
52. Adrianto, 糸井 龍一, 田中 俊昭, Numerical Simulation of Alcohol Tracer Test in a Geothermal Reservoir, 日本地熱学会平成27年学術講演会, 2015.10.
53. Toshihiro NAKAMURA, Toshiaki Tanaka, Ryuichi ITOI, Masato WATANABE, Daisuke FUKUDA, Kazuto MATSUMOTO, Characteristics of Analysis Results of Tracer Responses through a Vertical Two-Dimensional Porous Medium using Multi Flow Path Model, 8th International Conference On Geological and Geo-Resources Engineering & 7th Mineral Symposium, 2015.09.
54. Toshiaki Tanaka, Hideki Mizunaga, Development of Measuring Instruments for Fluid Flow Electromagnetic Method to Monitor Geothermal Fluid Flow, World Geothermal Congress 2015, 2015.04.
55. Hideki Mizunaga, Toshiaki Tanaka, Three-dimensional Inversion of Fluid Flow Electromagnetic Method to Visualize Geothermal Fluid Flow, World Geothermal Congress 2015, 2015.04.
56. Shunichi HIRAYAMA, RYUICHI ITOI, Toshiaki Tanaka, Junichi TAKAYAMA, Reservoir Simulation for Reinjected Water Return in Produced Fluid of Wells at Ogiri Geothermal Field, Japan, World Geothermal Congress 2015, 2015.04.
57. Tomohiro YAMASHITA, RYUICHI ITOI, Toshiaki Tanaka, Effects of Feed Point Configuration of Wells on Tracer Material Movement in Vertical Two Dimensional Porous Media, World Geothermal Congress 2015, 2015.04.
58. Kenta Kuma, Hideki Mizunaga, Toshiaki Tanaka, Three-dimensional Modeling and Inversion of Fluid Flow Electromagnetic Method, International Symposium on Earth Science and Technology 2014, 2014.12.
59. Yohei TATEISHI, RYUICHI ITOI, Toshiaki Tanaka, Natural-State Simulation of Geothermal Reservoir at Ogiri, Japan, Using a Numerical Model Incorporated with Stratigraphic Information, International Symposium on Earth Science and Technology 2014, 2014.12.
60. Yohei TATEISHI, RYUICHI ITOI, Toshiaki Tanaka, Junichi TAKAYAMA, Numerical simulation of evolution of steam-water two-phase zone in a fractured geothermal reservoir by considering capillary pressure effects, 36th New Zealand Geothermal Workshop 2014, 2014.11.
61. RYUICHI ITOI, Haruhiro INAGAKI, Toshiaki Tanaka, Takaichi IWASAKI, EFFECTS OF LOW TEMPERATURE WATER INFLOW INTO WELLBORE AT SHALLOW FEEDZONE OF PRODUCTION WELL ON STEAM-WATER TWO-PHASE FLOW IN WELL, 36th New Zealand Geothermal Workshop 2014, 2014.11.
62. Lingkan Finna Christi, 糸井 龍一, 田中 俊昭, Tritium tracer test analysis on the basis of one dimensional linear flow model of geothermal reservoir – A case study in Lahendong, Indonesia, 日本地熱学会平成26年学術講演会, 2014.10.
63. Masahiro TAKAKI, Tomohiro YAMASHIATA, Toshiaki Tanaka, RYUICHI ITOI, Laboratory experiment of tracer test using two kind of dyes in the vertical two-dimensional porous media, Grand Renewable Energy 2014, 2014.07.
64. Toshiaki Tanaka, Hideki Mizunaga, Development of measurement system for fluid flow electromagnetic method to evaluate geothermal fluid flow behavior, Grand Renewable Energy 2014, 2014.07.
65. Kenta Kuma, Hideki Mizunaga, Toshiaki Tanaka, Three-dimensional Numerical Simulation of Fluid Flow Electromagnetic Method for Geothermal Fluid, Grand Renewable Energy 2014, 2014.07.
66. Shota Kukita, Hideki Mizunaga, Toshiaki Tanaka, 3-D Forward Modeling of Airborne TEM Method for Wide Geothermal Area, Grand Renewable Energy 2014, 2014.07.
67. Yohei TATEISHI, RYUICHI ITOI, Toshiaki Tanaka, Naoto HIRAGA, Junichi TAKAYAMA, Estimation of Reservoir Parameters of the Ogiri Geothermal Field Using iTOUGH2, International Symposium on Earth Science and Technology 2013, 2013.12.
68. Takeshi HINO, Toshiaki Tanaka, RYUICHI ITOI, Agung PAMBUDI, Khasani, Effects of Production and Injection Rates on the Reservoir Performance of the Dieng Geothermal Field, Central Java, Indonesia, International Symposium on Earth Science and Technology 2013, 2013.12.
69. Takumi MARUO, Masahiro TAKAKI, Toshiaki Tanaka, RYUICHI ITOI, Laboratory Experiment and Numerical Simulation of Tracer Test with Vertical Two-dimensional Porous Media, International Symposium on Earth Science and Technology 2013, 2013.12.
70. Masahiro TAKAKI, Takumi MARUO, Toshiaki Tanaka, RYUICHI ITOI, Laboratory Experiment of Tracer Test in the Vertical Two-dimensional Porous Media Using Two Kinds of Tracers, International Symposium on Earth Science and Technology 2013, 2013.12.
71. Takeshi Hino, Ryuichi Itoi, Toshiaki Tanaka, N. Agung Pambudi, Khasani, Natural state modeling of geothermal reservoir at Dieng, Central Java, Indonesia, Geothermal Resources Council Annual Meeting: A Global Resource, from Larderello to Las Vegas, GRC 2013, 2013.12, A three dimensional numerical reservoir model of the Dieng geothermal field was developed for the pre-exploitation stage using the TOUGH2 simulator with a forward analysis method. The model was verified by matching temperature profiles of exploration wells. The numerical model in the natural state simulation was able to successfully reproduce initial temperatures from 11 wells..
72. Yoseph CSS SYAH ALAM Boy, 糸井 龍一, 田中 俊昭, Rie Yamashiro, Geochemical studies of hot springs in the Cidanau geothermal field, Indonesia, 日本地熱学会平成25年学術講演会, 2013.11.
73. Takeshi HINO, RYUICHI ITOI, Toshiaki Tanaka, Nugroho Agung PAMBUDI, Khasani, Natural state model of Dieng geothermal field, Central Java, Indonesia, Geothermal Resources Council Annual Meeting 2013, 2013.10.
74. RYUICHI ITOI, Toshiaki Tanaka, Yasunari KATAYAMA, Naoto KUMGAI, Takaichi IWASAKI, Numerical Simulation of Instability of Geothermal Production Well, Geothermal Resources Council Annual Meeting 2013, 2013.10.
75. Masahiro TAKAKI, RYUICHI ITOI, Toshiaki Tanaka, Takumi MARUO, Laboratory Experiment of Tracer Test in the Vertical Two-Dimensional Porous Media With Newly Developed Tracer Sensors, Geothermal Resources Council Annual Meeting 2013, 2013.10.
76. Yohei TATEISHI, RYUICHI ITOI, Toshiaki Tanaka, Naoto HIRAGA, Jyunichi TAKAYAMA, Numerical Simulation of Devolution and Evolution of Steam-Water Two-Phase Zone in a Fractured Geothermal Reservoir at Ogiri, Japan, Geothermal Resources Council Annual Meeting 2013, 2013.10.
77. Ryosuke OKUMOTO, Hideki Mizunaga, Toshiaki Tanaka, Development of 2.5-D Modeling Software for Time-Domain IP Method, The Kick-off Seminar on ASEAN-Japan BUILD-UP Coorporative Education Program for Grobal Resource Developmentin Earth Resources Engineering, 2013.01.
78. Okuzawa Takeru, Toshiaki Tanaka, Hideki Mizunaga, Development of Measurement Equipment for Time-domain IP Method, The Kick-off Seminar on ASEAN-Japan BUILD-UP Coorporative Education Program for Grobal Resource Developmentin Earth Resources Engineering, 2013.01.
79. Hendra Riogilang, RYUICHI ITOI, Toshiaki Tanaka, Saeid Jalilinasrabady, Natural State Model of the Kotamobagu Geothermal System, North Sulawesi, Indonesia, Geothermal Resources Council Annual Meeting 2012, 2012.10.
80. Okuzawa Takeru, Toshiaki Tanaka, Hideki Mizunaga, Basic Experiment for Development of the Measurement Equipment for Time-Domain IP Method, KSEG International Sympusium on "Geophysics for Discovery and Exploration", 2012.09.
81. Okumoto Ryosuke, Hideki Mizunaga, Toshiaki Tanaka, Development of 2.5-D Modeling Program for Time-Domain IP Method, KSEG International Sympusium on "Geophysics for Discovery and Exploration", 2012.09.
82. Hideki Mizunaga, Toshiaki Tanaka, K. Ushijima, N. Ikeda, Fluid-flow monitoring by A4-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, 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..
83. Keisuke Ushijima, Hideki Mizunaga, Toshiaki Tanaka, Kazuo Masuda, Fluid flow monitoring of EOR process by electrical prospecting, 1997 Society of Exploration Geophysicists Annual Meeting, SEG 1997, 1997.11, An advanced geophysical technique for reservoir monitoring by electrical prospecting has been developed by the joint research works of Kyushu University and JAPEX on the EOR Project in Canada. The method has been applied to monitor fluid-flow behaviors during steam injection operations. With an automatic recording system controlled by a personal computer, charged potentials and spontaneous potentials can be simultaneously measured as a function of time at multiple stations surrounding an operating borehole. Fluid-flow behavior in the subsurface was visualized as a function of time by means of contour maps of the residual potential and the relative changes of apparent resistivity during the thermally enhanced oil recovery process at Hangingstone test site in Fort McMurray, Alberta, Canada..
84. Masahiro Takaki, Ryuichi Itoi, Toshiaki Tanaka, Takumi Maruo, Laboratory experiment of tracer test in the vertical two-dimensional porous media with newly developed tracer sensors, Geothermal Resources Council Annual Meeting: A Global Resource, from Larderello to Las Vegas, GRC 2013, We developed a vertical two-dimensional porous media for modeling a fault system, and conducted tracer experiments using two kinds of dye as a tracer material. In addition, in order to simultaneously measure concentrations of these dyes in the produced fluid of simulated production well, we developed optical tracer concentration sensors using an absorption spectrophotometry method. Results showed that concentrations of dyes were measured with an acceptable accuracy for the mixed solution of the tracers as it reached the production well..
85. Ryuichi Itoi, Yasunari Katayama, Toshiaki Tanaka, Naoto Kumagai, Takaichi Iwasaki, Numerical simulation of instability of geothermal production well, Geothermal Resources Council Annual Meeting: A Global Resource, from Larderello to Las Vegas, GRC 2013, Oscillations in wellhead pressure are sometimes observed in production wells with multiple feedzones. This instability affects stable steam production, and in extreme cases may cause steam production from the well to cease altogether. In this study, we developed a coupled model of transient wellbore and reservoir flows with two well feedzones. Then, numerical simulations were carried out to evaluate the effects of reservoir temperature on the flow characteristics of wells with multiple feedzones. These simulation results show that the cyclic changes in wellhead pressure are caused by temporal changes in the flash point depth within the wellbore..
86. Yohei Tateishi, Ryuichi Itoi, Toshiaki Tanaka, Naoto Hiraga, Junichi Takayama, Numerical simulation of devolution and evolution of steam-water two-phase zone in a fractured geothermal reservoir at Ogiri, Japan, Geothermal Resources Council Annual Meeting: A Global Resource, from Larderello to Las Vegas, GRC 2013, Numerical simulations of the Ogiri geothermal reservoir were conducted using a fractured reservoir model with particular focus on the periods of power plant maintenance when all production and reinjection wells are shut-in for a few weeks. The results show that the steam-water two-phase zone in the shallow reservoir shrinks somewhat and the single-phase water zone expands..
87. Hendra Riogilang, Ryuichi Itoi, Toshiaki Tanaka, Saeid Jalilinasrabady, Natural state model of the Kotamobagu geothermal system, North Sulawesi, Indonesia, Geothermal Resources Council Annual Meeting 2012 - Geothermal: Reliable, Renewable, Global, GRC 2012, A three-dimensional numerical reservoir modeling of the Kotamobagu hydrothermal system was carried out. A natural state model of Kotamobagu was obtained by conducting simulations by changing parameter values of permeability, heat and mass recharges. The results of simulation were calibrated to temperature data from hot spring of Liberia and Bongkudai villages. The developed model confirmed that mass flows upward from the bottom layer to the surface, then travels laterally. The dominant mass flows through faults running northeast and to southwest. The mass from the bottom of Mt. Muayat flows to the southwest through the andesitic lava and the pumice tuff layers. Further, at the surface of Liberia and Bongkudai area, 3kg/s of mass is being discharged to the hot spring, the portion of mass flows through the fault to the southwest and continues further to the west. In the southwest area, mainly in Bakan, there is no mass discharge corresponding to related modeling blocks. Simulation results implies that the source of heat and mass discharge at the Bakan hot spring is not derived from Mt. Muayat, but from some source below sedimentary formation..
88. Ryuichi Itoi, Seiji Yamashita, Toshiaki Tanaka, Junichi Takayama, Numerical simulation of reinjected water return to production wells in Ogiri geothermal reservoir, Japan, Geothermal Resources Council Annual Meeting 2011, Geothermal 2011, Magnitude of return of reinjected water to production wells was evaluated by numerical simulations with TOUGH2 at the Ogiri geothermal field for 13 years operation. A function of specifying two kinds of fluid in TOUGH2 was used to distinguish reinjection water and deep recharge fluid. Production wells located relatively adjacent to reinjection zone showed high mass ratio of reinjected water to produced fluid..
89. 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, 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..
90. 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, 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..
91. 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, 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..