Item talk:Q311712

From geokb

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   "name": "High concentration methane hydrate in a silt reservoir from the deep-water Gulf of Mexico",
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   "abstract": "We present results from 30 quantitative degassing experiments of pressure core sections collected during The University of Texas-Gulf of Mexico 2-1 (UT-GOM2-1) Hydrate Pressure Coring Expedition at Green Canyon Block 955 in the deep-water Gulf of Mexico as part of The University of Texas at Austin\u2013US Department of Energy Deepwater Methane Hydrate Characterization and Scientific Assessment. The hydrate saturation (Sh), the volume fraction of the pore space occupied by hydrate, is 79% to 93% within sandy silt beds (centimeters to meters in thickness) between 413 and 442 m below seafloor in 2032 m water depth. Sandy silt intervals are characterized by high compressional wave velocity (Vp) (2515\u20133012 m s\u22121) and are interbedded with clayey silt sections that have lower\u00a0Sh\u00a0(2%\u201335%) and lower\u00a0Vp\u00a0(1684\u20132023 m s\u22121). Clayey silt intervals are composed of thin laminae of silts with high\u00a0Sh\u00a0within clay-rich intervals containing little to no hydrate. Degassing of single-lithofacies sections reveals higher-resolution variation in\u00a0Sh\u00a0than is possible to observe in well logs; however, the average\u00a0Sh\u00a0of 64% through the reservoir is similar to well log estimates. Gas recovered from the hydrates during these experiments is composed almost entirely of methane (99.99% CH4, <100 ppm C2H6\u00a0on average), with an isotopic composition (\u03b413C: \u221260.4\u2030 and \u221263.6\u2030 Vienna Peedee belemnite and \u03b42H: \u2212178.2\u2030 and \u2212179.0\u2030 Vienna standard mean ocean water) that suggests the methane is primarily from a microbial source. A subset of six degassing experiments performed using very small pressure decrements indicates that the salinity within these samples is close to the average seawater concentration, suggesting that hydrate either formed slowly or formed during a rapid event at least tens of thousands of years before present.",
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