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dc.contributor.authorLee, J. Y.
dc.contributor.authorSantamarina, J. Carlos
dc.contributor.authorRuppel, Carolyn D.
dc.date.accessioned2010-08-24T19:00:50Z
dc.date.available2010-09-11T08:21:09Z
dc.date.issued2010-03-11
dc.identifier.citationGeochemistry Geophysics Geosystems 11 (2010): Q03007en_US
dc.identifier.urihttp://hdl.handle.net/1912/3864
dc.descriptionAuthor 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.abstractGas 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.sponsorshipThis 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.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.urihttps://doi.org/10.1029/2009GC002667
dc.subjectGas hydrateen_US
dc.subjectHydrate-bearing sedimenten_US
dc.subjectPhase transformationen_US
dc.subjectStrainen_US
dc.titleVolume change associated with formation and dissociation of hydrate in sedimenten_US
dc.typeArticleen_US
dc.identifier.doi10.1029/2009GC002667


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