NDLI: 3D Numerical model of the Obama hydrothermal–geothermal system, Southwestern Japan

Content Provider	Springer Nature Link
Author	Saibi, Hakim
Copyright Year	2011
Abstract	The Obama geothermal field is one of the most interesting geothermal areas in Kyushu Island, Southwestern Japan, because of its large number of high-temperature springs. A 3D numerical simulation study using the simulator TOUGH2 (module EOS3) was carried out to obtain a comprehensive hydrothermal model of the field. From previous geochemical studies, two main fluid sources were suggested for the Obama geothermal system: cold (sea, surface, and ground) water and deep geothermal fluids. We propose two heat sources, a lateral one at the eastern boundary of the system, near the West Unzen High Temperature Body located west of the Unzen fumarolic field, and a second one beneath the Obama geothermal field. The first source contributes the system by 150°C fluids. The second source contributes by 100°C fluids. Our model indicates that the first source has a temperature of 150°C, which agrees with the results from previous geochemical studies. The low enthalpy of the second source could be explained by the mixing of geothermal fluids with seawater, as the area is near the seashore and is highly faulted. The model that was developed can explain many of the subsurface processes active in the Obama geothermal field.
Starting Page	709
Ending Page	719
Page Count	11
File Format	PDF
ISSN	14200597
Journal	Computational Geosciences
Volume Number	15
Issue Number	4
e-ISSN	15731499
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-05-06
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Numerical model Obama geothermal field Heat source Japan Applied Earth Sciences Soil Science & Conservation Hydrogeology Mathematical Modeling and Industrial Mathematics
Content Type	Text
Resource Type	Article
Subject	Computers in Earth Sciences Computational Theory and Mathematics Computer Science Applications Computational Mathematics

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