Gassy sediment occurrence and properties: Northern Gulf of Mexico |
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| Authors: | Aubrey L Anderson William R Bryant |
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| Institution: | (1) Department of Oceanography, Texas A&M University, 77843-3146 College Station, TX, USA |
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| Abstract: | Free gas is ubiquitous at shallow sediment depths of the northern margin of the Gulf of Mexico. Gassy sediment patches are
between 250 and 500 m in horizontal size. Often the gassy layers are within 100 m from the sea floor and are only a few meters
thick. Both biogenic and thermogenic gas hydrates have been recovered. Stability values of temperature and pressure indicate
that hydrates can exist in water depths less than 500 m. Gassy sediment geoacoustic parameter values are not well constrained
because of a lack of concurrent measurements of acoustic properties and sediment gas content. For Gulf of Mexico gassy sediment,
some reportedin situ values of sound speed are reduced by an order of magnitude below values for water saturated sediments. More commonly, sound
speed is reduced from water saturated sediment values by only 15 to 50 percent. |
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