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    Volume change associated with formation and dissociation of hydrate in sediment

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    2009GC002667.pdf (605.9Kb)
    Date
    2010-03-11
    Author
    Lee, J. Y.  Concept link
    Santamarina, J. Carlos  Concept link
    Ruppel, Carolyn D.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3864
    As published
    https://doi.org/10.1029/2009GC002667
    DOI
    10.1029/2009GC002667
    Keyword
     Gas hydrate; Hydrate-bearing sediment; Phase transformation; Strain 
    Abstract
    Gas hydrate formation and dissociation in sediments are accompanied by changes in the bulk volume of the sediment and can lead to changes in sediment properties, loss of integrity for boreholes, and possibly regional subsidence of the ground surface over areas where methane might be produced from gas hydrate in the future. Experiments on sand, silts, and clay subject to different effective stress and containing different saturations of hydrate formed from dissolved phase tetrahydrofuran are used to systematically investigate the impact of gas hydrate formation and dissociation on bulk sediment volume. Volume changes in low specific surface sediments (i.e., having a rigid sediment skeleton like sand) are much lower than those measured in high specific surface sediments (e.g., clay). Early hydrate formation is accompanied by contraction for all soils and most stress states in part because growing gas hydrate crystals buckle skeletal force chains. Dilation can occur at high hydrate saturations. Hydrate dissociation under drained, zero lateral strain conditions is always associated with some contraction, regardless of soil type, effective stress level, or hydrate saturation. Changes in void ratio during formation-dissociation decrease at high effective stress levels. The volumetric strain during dissociation under zero lateral strain scales with hydrate saturation and sediment compressibility. The volumetric strain during dissociation under high shear is a function of the initial volume average void ratio and the stress-dependent critical state void ratio of the sediment. Other contributions to volume reduction upon hydrate dissociation are related to segregated hydrate in lenses and nodules. For natural gas hydrates, some conditions (e.g., gas production driven by depressurization) might contribute to additional volume reduction by increasing the effective stress.
    Description
    Author Posting. © American Geophysical Union, 2010. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 11 (2010): Q03007, doi:10.1029/2009GC002667.
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    • Energy and Geohazards
    Suggested Citation
    Geochemistry Geophysics Geosystems 11 (2010): Q03007
     

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