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Pressure-induced structural changes of methane hydrate and their application to developing techniques on gas hydrates reservoir.

Research Project

Project/Area Number 14550871
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 資源開発工学
Research InstitutionUniversity of Tsukuba

Principal Investigator

YAGI Hisako  University of Tsukuba, Graduate School of Life and Enbironmental Sciences, Asaistent Professor, 大学院・生命環境科学研究科, 講師 (60218758)

Co-Investigator(Kenkyū-buntansha) YAMAMOTO Yoshitaka  National Institute of Advanced Industrial Science and Technology, Senior Researcher, エネルギー利用研究グループ, 主任研究員
Project Period (FY) 2002 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2004: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2003: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2002: ¥2,100,000 (Direct Cost: ¥2,100,000)
Keywordsmethane hydrate / high-pressure structure / filled ice structure / diamond anvil cell / intra-molecular vibration mode / high-pressure stability / ダイヤモンドアンビル / 構造変化 / 高圧
Research Abstract

Methane hydrate, called as "fiery ice", is expected to be a fruitful natural resource, at the same time, methane is rather effective greenhouse gas than carbon dioxide. In order to develop the techniques for practical using methane hydrate, understanding on basic properties such as stability and structural changes under high pressure of methane hydrate are indispensable. In this research, high-pressure experiments were performed in the pressure range from 0.1 MPa to 86 GPa using diamond anvil cell, to clarify the changes in structure and hydration number of methane hydrate and also to provide the knowledge to developing new technique for gas hydrate reservoir. The in-situ X-ray difrractmetry (XRD), Raman spectroscopy, and optical microscopy revealed several structural changes. The initial structure of methane hydrate (MH-sI) became a hexagonal structure (MH-sH) at approximately 1.0 GPa and was further transformed into an orthorhombic filled ice I_h, structure (MH-ice I_hi,) at 2.0 GPa, as has previously been observed. The MH-ice I_h, survived up to 42 GPa. On the other hand, the other gas hydrates decomposed into ice VII and solid phases of guest gas components below 5 to 6 GPa. The main reason for the characteristic stability of methane hydrate was examined to be due to attractive interaction between methane molecules and between methane molecules and water molecules of the framework. Above 42 GPa, MH-ice I_h changed to further high-pressure structure, however the detail structural analysis could not made because of broadness of the XED pattern.

Report

(4 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (8 results)

All 2004 Other

All Journal Article (4 results) Publications (4 results)

  • [Journal Article] Structural changes in gas hydrates and existence of a filled ice structure of methane hydrate above 40 GPa.2004

    • Author(s)
      H.Hirai et al.
    • Journal Title

      J.Phys.Chem.Solid 65

      Pages: 1555-1559

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] メタンハイドレートの相変化とその地球惑星科学的意義2004

    • Author(s)
      平井寿子
    • Journal Title

      岩石鉱物科学 33

      Pages: 121-128

    • NAID

      10012803720

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Structural changes in gas hydrates and existence of a filled ice structure of methane hydrate above 40 GPa.2004

    • Author(s)
      Hirai, H., Tanaka, T., Kawamura, T., Yamamoto, Y.
    • Journal Title

      J.Phys.Chem.Solid 65

      Pages: 1555-1559

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Structural changes of methane hydrate and its meanings of geological and planetary science2004

    • Author(s)
      Hirai, H
    • Journal Title

      Japanese Magazine of Mineralogical and Petrological Science 33

      Pages: 121-128

    • NAID

      10012803720

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] Hisako Hirai et al.: "Retention of filled ice structure of methane hydrate up to 42 GPa"Phys.Rev.B. 68[17]. 172102-1-172102-4 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Hisako Hirai et al.: "Pressure-indued phase changes of argon hydrate and methane hydrate at room temperature"Proc. Jpn. Acad. ser. B. 78・3. 39-44 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Hisako Hirai et al.: "Structural changes of argon hydrate under high pressure"J. Phys. Chem.. B. 106・43. 11089-11092 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Hisako Hirai et al.: "High-pressure structures of methane hydrate"J. Physics : Condensed Mater. 14・44. 11443-11446 (2002)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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