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- W2034180441 abstract "In the summer of 1985, UNOCAL carried out a 55-day surface geochemical survey in the Norwegian Sector of the North Sea. The program was set up to include a variety of geochemical techniques to aid evaluation of their effectiveness for detecting hydrocarbon seepages in the marine environment. The ship was equipped with both bottom-water and bottom-sediment sampling devices and an analytical laboratory and computer network so that “onboard” measurements and “real time” data interpretation could be made. During the survey, >4100 line-kilometers of bottom-water data (∼11,000 sites) and 320 sediment cores were obtained. A major hydrocarbon gas anomaly was defined during part of the bottom-water sampling program. A set of sediment cores was taken in the vicinity of this anomaly. The data from these cores are used to illustrate the fate of hydrocarbon migration through unconsolidated marine sediment. Migration by bubble ebullition transports hydrocarbons through the near-surface sediment and produces gas plumes in the bottom water. Trapping of bubbles in the sediment will produce patchy, temporal hydrocarbon “anomalies” in the sediment. However, extensive sediment anomalies, such as those proposed to be developed by microseepage, can only be formed at depth in the sediment below the level where sulfate is depleted from the pore water. These anomalies result because vertical migration by molecular diffusion creates a steady-state hydrocarbon oxidation zone (sulfate reduction zone) at depth in the sediment which efficiently eliminates hydrocarbon transport further to the surface." @default.
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- W2034180441 date "1988-12-01" @default.
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- W2034180441 title "Petroleum-related hydrocarbon seep age in a Recent North Sea sediment" @default.
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