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1997 Fiscal Year Final Research Report Summary

Study of Geothermal Systems and its application to Geothermal Resource Assesment

Research Project

Project/Area Number 07305048
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field 資源開発工学
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

EHARA Sachio  FAC.ENG., KYUSHU UNIV.PROFESSOR, 工学部, 教授 (10002346)

Co-Investigator(Kenkyū-buntansha) TAGUCHI Sachihiro  FAC.SCI., FUKUOKA UNIV., PROFESSOR, 理学部, 教授 (00108771)
ITOI Ryuuich  FAC.ENG., KYUSHU UNIV., ASSOC.PROF., 工学部, 助教授 (50108768)
MOGI Tohru  FAC.ENG., KYUSHU UNIV., RESEARCH ASSOC., 工学部, 助手 (80182161)
FUJIMITSU Yasuhiro  FAC.ENG., KYUSHU UNIV.ASSOC.PROF., 工学部, 助教授 (10264095)
Project Period (FY) 1995 – 1997
KeywordsGeothermal system / Geothermal resource / Geothermal modelling / Geothermal structure / Volcanic activity / Magma
Research Abstract

In this study we clarified the theramal strucutes and processes of geothermal and volcanic systems in cenral Kyushu, Japan, from geological, geophysical and geochemical standpoints. The main results are shown below.
1.The geothermal resource around Kuju volcano, central Kyushu is estimated at 1200MW・30years (surface to 3km deep) and 14000MW・30years (surface to 10km deep).
2.A model of gravity structure in the central Kyushu is presented. The underground structures of Kuju volcano, Aso volcano and Unzen volcano are investigated from seismological, electromagnetic and thermal methods :
3.The Quatemary tectonics in the central Kyushu is investigated and clarified the tectonic background of Kuju volcanic and geothermal systems.
4.The fluids flow systems at some geothermal systems (Beppu and central part of Kuju volcano) in central Kyushu are investigated. As a result, new ideas about deep geothermal fluids and mixing deep geothermal fluids with surface water are developed.
5.Environmental aspects of volcanic eruption and geothermal fluid extraction and reinjection are investigated at Kuju volcano and some geothermal fields around Kuju volcano. Some new methods for fluid flow monitoring were developed.
6.The time of the occurrence of the Hatchobaru geothermal system in central Kyushu was clarified from geologically.
7.The initial stage of development of geothermal systems accompanying with the 1995 eruption of Kuju volcano was clarified from joint observation of geology, geophysics and geochemistry. The resuls obtained are very important to understand the development of geothermal systems.
8.The new simulation program was developed to study the development of geothermal systems beneath active volcanoes. The program was applied to Kuju volcano and presented an new idea of developmen of two phase reservoir beneath the active volcano.

  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 江原 幸雄: "Effect of development on geothermal system deduced from gravity and thermal measurements:Japanese case studies" Proc.of NEDO Int.Geothermal Symp.235-241 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 江原 幸雄: "九重火山下の熱過程と1995年噴火" 月刊地球(号外). 17号. 106-111 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 小野 暁: "FT-IRによる九重硫黄山におけるCOガスの遠隔観測" 火山. 42. 47-51 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 茂木 透: "九州西部地域の電気伝導度構造" 月刊地球(号外). 17号. 117-122 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 楠本 成寿: "重力異常からみた九州中部地域東部の第四紀テクトニクス" 地学雑誌. 106. 635-643 (1977)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 波多江 憲治: "九重火山1995-96年噴火活動に伴う火山灰中の発泡ガラス含有量の時間変化" 火山. 42. 345-353 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Ehara et al: "Effect of development ofn geothermal system deduced from gravity and thermal measurements" Proc.NEDO Geothermal Symposium. 235-241 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Ehara and A.Singarimbun: "Thermal processes beneath Kuju volcano and its 1995 eruption" Gekkan Chikyu. No.17. 106-111 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Ono et al.: "Remote obsevation of CO gas using FT-IR at Kuju-iwoyama" Kazan. Vol.42, No.1. 47-51 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Mogi et al.: "Electical conductivity structure in the western part opf Kyushu" Gekkan Chikyu. No.17. 117-122 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Kusumoto et al.: "Quaternary tectonic interpretation around the eastern part of central Kyushy, Japan, besed of gravity analysis" Jourmal of Geology. Vol.106, No.5. 635-643 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Hatae et al.: "Variation in content of vesiculated glasses in volcanic ash erupted from Kuju volcano in 1995-96, Japan" Kazan. Vol.42, No.5. 345-353 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] A.Singarimbun et al.: "A numerical model of magmatic hydrothermal system and its application to Kuju volcao" Mem., Fac.Engi.Kyushu Univ.Vol.56, No.4. 229-243

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Ehara et al.: "Proposal for scientific drilling on Kuju volcano, central Kyushu, Japan" Proc. VIII Int Symp. on the Observation of the Continental Crust through Drilling. 127-130 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Ehara: "Geothermal resources of Kyshu, southwest Japan with special foucus on the Kuju volcanic region" Geothermal Resouces Council Transactions. Vol.19. 305-310 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Ehara and Y.Fujimitsu: "The nature and occurrence of geothermal resources of Japan-A review-" Geothermal Resouces Council Transactions. Vol.19. 311-316 (1995)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-16  

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