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Transformations in methane hydrates.

I M Chou1, A Sharma, R C Burruss

  • 1954 National Center and 956 National Center, United States Geological Survey, Reston, VA 20192, USA. imchou@usgs.gov

Proceedings of the National Academy of Sciences of the United States of America
|November 23, 2000
PubMed
Summary
This summary is machine-generated.

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High pressure reveals two new methane hydrate structures: structure II and structure H. Structure II may dominate in deep ocean sediments, impacting gas hydrate stability.

Area of Science:

  • Geochemistry
  • Materials Science
  • Crystallography

Background:

  • Methane hydrate, a crystalline solid, forms under high pressure and low temperature conditions.
  • Existing knowledge primarily describes structure I methane hydrate.
  • Understanding methane hydrate structures is crucial for energy resource exploration and climate change studies.

Purpose of the Study:

  • To investigate the high-pressure structural behavior of pure methane hydrate.
  • To identify and characterize novel methane hydrate structures.
  • To assess the potential prevalence of different methane hydrate structures in geological settings.

Main Methods:

  • In situ optical microscopy
  • Raman spectroscopy
  • X-ray microprobe analysis

Related Experiment Videos

  • Diamond anvil cell for high-pressure generation

    • Main Results:

    • Discovery of two new methane hydrate structures: structure II and structure H.
    • Characterization of structure II (cubic, a = 17.158(2) Å, V = 5051.3(13) ų) at 250 MPa.
    • Characterization of structure H (hexagonal, a = 11.980(2) Å, c = 9.992(3) Å, V = 1241.9(5) ų) at 600 MPa.
    • Compositions of the new structures remain undetermined.

    Conclusions:

    • High pressure induces the formation of previously unknown methane hydrate structures.
    • Structure II methane hydrate is predicted to be more stable than structure I in deep marine sediments.
    • These findings have implications for understanding gas hydrate stability and distribution in the Earth's subsurface.