3D Numerical model of the Obama hydrothermal-geothermal system, Southwestern Japan

Hakim Saibi

Research output: Contribution to journalArticle

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.

Original languageEnglish
Pages (from-to)709-719
Number of pages11
JournalComputational Geosciences
Volume15
Issue number4
DOIs
Publication statusPublished - Sep 1 2011

Fingerprint

geothermal system
Japan
3D Model
Numerical models
Geothermal fields
Fluid
Fluids
fluid
Ground Water
Heat Source
heat source
Surface waters
enthalpy
Seawater
Temperature
simulator
Coastal zones
Groundwater
Enthalpy
Lateral

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Computers in Earth Sciences
  • Computational Theory and Mathematics
  • Computational Mathematics

Cite this

3D Numerical model of the Obama hydrothermal-geothermal system, Southwestern Japan. / Saibi, Hakim.

In: Computational Geosciences, Vol. 15, No. 4, 01.09.2011, p. 709-719.

Research output: Contribution to journalArticle

@article{76d6a3d05f764bd79ab5c91afaba1d68,
title = "3D Numerical model of the Obama hydrothermal-geothermal system, Southwestern Japan",
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.",
author = "Hakim Saibi",
year = "2011",
month = "9",
day = "1",
doi = "10.1007/s10596-011-9237-3",
language = "English",
volume = "15",
pages = "709--719",
journal = "Computational Geosciences",
issn = "1420-0597",
publisher = "Springer Netherlands",
number = "4",

}

TY - JOUR

T1 - 3D Numerical model of the Obama hydrothermal-geothermal system, Southwestern Japan

AU - Saibi, Hakim

PY - 2011/9/1

Y1 - 2011/9/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=80053102516&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=80053102516&partnerID=8YFLogxK

U2 - 10.1007/s10596-011-9237-3

DO - 10.1007/s10596-011-9237-3

M3 - Article

VL - 15

SP - 709

EP - 719

JO - Computational Geosciences

JF - Computational Geosciences

SN - 1420-0597

IS - 4

ER -