Physical properties of sediment from the Mount Elbert Gas Hydrate Stratigraphic Test Well, Alaska North Slope


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dc.contributor.author Winters, William J.
dc.contributor.author Walker, Michael
dc.contributor.author Hunter, Robert
dc.contributor.author Collett, Timothy S.
dc.contributor.author Boswell, Ray M.
dc.contributor.author Rose, Kelly K.
dc.contributor.author Waite, William F.
dc.contributor.author Torres, Marta
dc.contributor.author Patil, Shirish
dc.contributor.author Dandekar, Abhijit
dc.date.accessioned 2011-03-16T20:13:52Z
dc.date.available 2011-03-16T20:13:52Z
dc.date.issued 2010-01-18
dc.identifier.citation Marine and Petroleum Geology 28 (2011): 361-380 en_US
dc.identifier.uri http://hdl.handle.net/1912/4400
dc.description This 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.abstract This 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.sponsorship This 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.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher Elsevier B.V. en_US
dc.relation.uri http://dx.doi.org/10.1016/j.marpetgeo.2010.01.008
dc.subject Gas hydrate en_US
dc.subject Sagavanirktok Formation en_US
dc.subject Milne Point en_US
dc.subject Physical properties en_US
dc.subject Grain size en_US
dc.subject Mineralogy en_US
dc.subject Porosity en_US
dc.subject Permeability en_US
dc.title Physical properties of sediment from the Mount Elbert Gas Hydrate Stratigraphic Test Well, Alaska North Slope en_US
dc.type Article en_US
dc.identifier.doi 10.1016/j.marpetgeo.2010.01.008

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