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dc.contributor.authorDai, Sheng  Concept link
dc.contributor.authorSantamarina, J. Carlos  Concept link
dc.contributor.authorWaite, William F.  Concept link
dc.contributor.authorKneafsey, Timothy J.  Concept link
dc.date.accessioned2012-12-18T18:19:43Z
dc.date.available2014-10-22T08:57:23Z
dc.date.issued2012-11-14
dc.identifier.citationJournal of Geophysical Research 117 (2012): B11205en_US
dc.identifier.urihttps://hdl.handle.net/1912/5635
dc.descriptionAuthor Posting. © American Geophysical Union, 2012. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 117 (2012): B11205, doi:10.1029/2012JB009667.en_US
dc.description.abstractThe physical properties of gas hydrate-bearing sediments depend on the volume fraction and spatial distribution of the hydrate phase. The host sediment grain size and the state of effective stress determine the hydrate morphology in sediments; this information can be used to significantly constrain estimates of the physical properties of hydrate-bearing sediments, including the coarse-grained sands subjected to high effective stress that are of interest as potential energy resources. Reported data and physical analyses suggest hydrate-bearing sands contain a heterogeneous, patchy hydrate distribution, whereby zones with 100% pore-space hydrate saturation are embedded in hydrate-free sand. Accounting for patchy rather than homogeneous hydrate distribution yields more tightly constrained estimates of physical properties in hydrate-bearing sands and captures observed physical-property dependencies on hydrate saturation. For example, numerical modeling results of sands with patchy saturation agree with experimental observation, showing a transition in stiffness starting near the series bound at low hydrate saturations but moving toward the parallel bound at high hydrate saturations. The hydrate-patch size itself impacts the physical properties of hydrate-bearing sediments; for example, at constant hydrate saturation, we find that conductivity (electrical, hydraulic and thermal) increases as the number of hydrate-saturated patches increases. This increase reflects the larger number of conductive flow paths that exist in specimens with many small hydrate-saturated patches in comparison to specimens in which a few large hydrate saturated patches can block flow over a significant cross-section of the specimen.en_US
dc.description.sponsorshipResearch support provided to Georgia Tech by the Department of Energy/JIP project for methane hydrate, administered by Chevron. Additional funding provided by the Goiuzeta Foundation, the Gas Hydrate Project of the U.S. Geological Survey’s Coastal and Marine Geology Program, and the Assistant Secretary for Fossil Energy, Office of Oil and Natural Gas, Gas Hydrate Program through the National Energy Technology Laboratory of the U.S. Department of Energy under contract DE-AC02-05CH11231.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.urihttps://doi.org/10.1029/2012JB009667
dc.subjectAnalytical modelen_US
dc.subjectGas hydrateen_US
dc.subjectHydrate pore habiten_US
dc.subjectHydrate-bearing sedimentsen_US
dc.subjectNumerical modelen_US
dc.subjectUpper and lower boundsen_US
dc.titleHydrate morphology : physical properties of sands with patchy hydrate saturationen_US
dc.typeArticleen_US
dc.description.embargo2013-05-14en_US
dc.identifier.doi10.1029/2012JB009667


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