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dc.contributor.authorWinters, William J.
dc.contributor.authorWalker, Michael
dc.contributor.authorHunter, Robert
dc.contributor.authorCollett, Timothy S.
dc.contributor.authorBoswell, Ray M.
dc.contributor.authorRose, Kelly K.
dc.contributor.authorWaite, William F.
dc.contributor.authorTorres, Marta E.
dc.contributor.authorPatil, Shirish
dc.contributor.authorDandekar, Abhijit
dc.date.accessioned2011-03-16T20:13:52Z
dc.date.available2011-03-16T20:13:52Z
dc.date.issued2010-01-18
dc.identifier.citationMarine and Petroleum Geology 28 (2011): 361-380en_US
dc.identifier.urihttp://hdl.handle.net/1912/4400
dc.descriptionThis paper is not subject to U.S. copyright. The definitive version was published in Marine and Petroleum Geology 28 (2011): 361-380, doi:10.1016/j.marpetgeo.2010.01.008.en_US
dc.description.abstractThis study characterizes cored and logged sedimentary strata from the February 2007 BP Exploration Alaska, Department of Energy, U.S. Geological Survey (BPXA-DOE-USGS) Mount Elbert Gas Hydrate Stratigraphic Test Well on the Alaska North Slope (ANS). The physical-properties program analyzed core samples recovered from the well, and in conjunction with downhole geophysical logs, produced an extensive dataset including grain size, water content, porosity, grain density, bulk density, permeability, X-ray diffraction (XRD) mineralogy, nuclear magnetic resonance (NMR), and petrography. This study documents the physical property interrelationships in the well and demonstrates their correlation with the occurrence of gas hydrate. Gas hydrate (GH) occurs in three unconsolidated, coarse silt to fine sand intervals within the Paleocene and Eocene beds of the Sagavanirktok Formation: Unit D-GH (614.4 m–627.9 m); unit C-GH1 (649.8 m–660.8 m); and unit C-GH2 (663.2 m–666.3 m). These intervals are overlain by fine to coarse silt intervals with greater clay content. A deeper interval (unit B) is similar lithologically to the gas-hydrate-bearing strata; however, it is water-saturated and contains no hydrate. In this system it appears that high sediment permeability (k) is critical to the formation of concentrated hydrate deposits. Intervals D-GH and C-GH1 have average “plug” intrinsic permeability to nitrogen values of 1700 mD and 675 mD, respectively. These values are in strong contrast with those of the overlying, gas-hydrate-free sediments, which have k values of 5.7 mD and 49 mD, respectively, and thus would have provided effective seals to trap free gas. The relation between permeability and porosity critically influences the occurrence of GH. For example, an average increase of 4% in porosity increases permeability by an order of magnitude, but the presence of a second fluid (e.g., methane from dissociating gas hydrate) in the reservoir reduces permeability by more than an order of magnitude.en_US
dc.description.sponsorshipThis work was supported by the Coastal and Marine Geology, and Energy Programs of the U.S. Geological Survey and funding was provided by the Gas Hydrate Program of the U.S. Department of Energy.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherElsevier B.V.en_US
dc.relation.urihttps://doi.org/10.1016/j.marpetgeo.2010.01.008
dc.subjectGas hydrateen_US
dc.subjectSagavanirktok Formationen_US
dc.subjectMilne Pointen_US
dc.subjectPhysical propertiesen_US
dc.subjectGrain sizeen_US
dc.subjectMineralogyen_US
dc.subjectPorosityen_US
dc.subjectPermeabilityen_US
dc.titlePhysical properties of sediment from the Mount Elbert Gas Hydrate Stratigraphic Test Well, Alaska North Slopeen_US
dc.typeArticleen_US
dc.identifier.doi10.1016/j.marpetgeo.2010.01.008


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