Light hydrocarbons in gas pockets and sediments of ODP Site 131-808

A suite of gas samples obtained from gas pockets and sediments of the Nankai accretionary prism (Site 808) has been analyzed for their gas composition and carbon and hydrogen isotope ratios. Gases collected from gas pockets between 10 and 555 mbsf consist of CH4 and CO2. Stable carbon isotope ratios of these two components point to a bacterial formation of methane via CO2-reduction that is also supported by D/H ratios of methane. Methane desorbed from sediments by a vacuum/acid treatment is of bacterial and thermal origin. Mixing between these gas types is indicated by molecular composition and carbon isotope ratios. Diagenetic processes at low temperatures can explain ethane to pentane concentrations from 0 to 850 mbsf. Between 850 mbsf and the basaltic basement hydrocarbon occurrences are related to catagenetic processes at elevated temperatures. Thermal alteration of organic matter is reflected through different gas parameters. Propane carbon isotope values of a sample from the zone of the frontal thrust indicate that the gas likely migrated from sediments of a higher maturity into the immature sediments at 366 mbsf.

National gas supply and demand, 1971-1990

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Mode of access: Internet.

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Cover title.

Injuries in oil and gas drilling and services.

Chiefly tables.

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Introductory note signed: Josiah B. Millet.

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The present edition ... comprises the contents of the edition in three volumes published by Lord Wharncliffe in 1837, including the introductory anecdotes contributed by the late Lady Louisa Stuart--Pref.

Character of Lord Bacon : his life and works /

Mode of access: Internet.

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Mode of access: Internet.

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Mode of access: Internet.

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Bibliographical footnotes.

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"Portions of this book first published [by the Dept. of Marine Engineering, U. S. Naval Academy] as a part of Combustion engines manual and...of Internal combustion engines."

Expansion of gas clouds and hypersonic jets bounded by a vacuum.

"SSD-TDR-62-96. Report no. TDR-169 (3230-12) TR-1. Contract no. AF 04(695)-169."