Parametric study of the physical properties of hydrate-bearing sand, silt, and clay sediments : 1. Electromagnetic properties Lee, J. Y. Santamarina, J. Carlos Ruppel, Carolyn D. 2010-12-06T14:37:57Z 2011-05-09T08:24:40Z 2010-11-09
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 Journal of Geophysical Research 115 (2010): B11104, doi:10.1029/2009JB006669. en_US
dc.description.abstract The marked decrease in bulk electrical conductivity of sediments in the presence of gas hydrates has been used to interpret borehole electrical resistivity logs and, to a lesser extent, the results of controlled source electromagnetic surveys to constrain the spatial distribution and predicted concentration of gas hydrate in natural settings. Until now, an exhaustive laboratory data set that could be used to assess the impact of gas hydrate on the electromagnetic properties of different soils (sand, silt, and clay) at different effective stress and with different saturations of hydrate has been lacking. The laboratory results reported here are obtained using a standard geotechnical cell and the hydrate-formed tetrahydrofuran (THF), a liquid that is fully miscible in water and able to produce closely controlled saturations of hydrate from dissolved phase. Both permittivity and electrical conductivity are good indicators of the volume fraction of free water in the sediment, which is in turn dependent on hydrate saturation. Permittivity in the microwave frequency range is particularly predictive of free water content since it is barely affected by ionic concentration, pore structure, and surface conduction. Electrical conductivity (or resistivity) is less reliable for constraining water content or hydrate saturation: In addition to fluid-filled porosity, other factors, such as the ionic concentration of the pore fluid and possibly other conduction effects (e.g., surface conduction in high specific surface soils having low conductivity pore fluid), also influence electrical conductivity. 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. Additional support was provided to J.C.S. by the Goizueta Foundation at Georgia Tech, to J.Y.L. by KIGAM, and to C. Ruppel by the USGS. en_US
dc.format.mimetype application/pdf
dc.identifier.citation Journal of Geophysical Research 115 (2010): B11104 en_US
dc.identifier.doi 10.1029/2009JB006669
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.subject Gas hydrate en_US
dc.subject Electromagnetic properties en_US
dc.subject Resistivity en_US
dc.title Parametric study of the physical properties of hydrate-bearing sand, silt, and clay sediments : 1. Electromagnetic properties en_US
dc.type Article en_US
dspace.entity.type Publication
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