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Volume change associated with formation and dissociation of hydrate in sediment

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dc.contributor.author Lee, J. Y.
dc.contributor.author Santamarina, J. Carlos
dc.contributor.author Ruppel, Carolyn D.
dc.date.accessioned 2010-08-24T19:00:50Z
dc.date.available 2010-09-11T08:21:09Z
dc.date.issued 2010-03-11
dc.identifier.citation Geochemistry Geophysics Geosystems 11 (2010): Q03007 en_US
dc.identifier.uri http://hdl.handle.net/1912/3864
dc.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. en_US
dc.description.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. en_US
dc.description.sponsorship This research was initially supported by the Chevron Joint Industry Project on Methane Hydrates under contract DE‐FC26‐01NT41330 from the U.S. Department of Energy to Georgia Tech. Additional support was provided to J. Y. Lee by KIGAM, GHDO, and MKE and J. C. Santamarina by the Goizueta Foundation. en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.uri http://dx.doi.org/10.1029/2009GC002667
dc.subject Gas hydrate en_US
dc.subject Hydrate-bearing sediment en_US
dc.subject Phase transformation en_US
dc.subject Strain en_US
dc.title Volume change associated with formation and dissociation of hydrate in sediment en_US
dc.type Article en_US
dc.identifier.doi 10.1029/2009GC002667


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