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Abstract
Chapter from: M
66: Hydrocarbon Migration And Its Near-Surface Expression
Edited By
Dietmar Schumacher and Michael A. AbramsAuthor:
K. F. M. Thompson Geochemistry, Generation, Migration
Published 1996 as
part of Memoir 66
Copyright © 1996 The American Association of Petroleum
Geologists. All Rights Reserved.
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Thompson,K.
F. M., 1996, Postulated generation of bacterial methane from seepage petroleum
in sea floor sediments of the Gulf of Mexico, in D. Schumacher and
M. A. Abrams, eds., Hydrocarbon migration and its near-surface expression:
AAPG Memoir 66, p. 331-334.
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Chapter
24
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Postulated
Generation of Bacterial Methane from Seepage Petroleum in Sea Floor Sediments
of the Gulf of Mexico |
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| K. F. M.
Thompson
Petrosurveys, Inc.
Dallas, Texas, U.S.A.
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Abstract
Evidence from
large numbers of sediment cores collected on the continental slope of the
U.S. Gulf of Mexico suggests that methane is generated by bacteria at depths
of about 4 m from seepage petroleum. Marine sediment-dwelling methanogenic
bacteria use carbon dioxide generated at shallow depths by aerobic and
anaerobic bacteria from available organic material. Until the cores described
here were evaluated, it appeared that shallow occurrences of biogenic methane
in Pliocene, Pleistocene, and Recent sediments of the Gulf Coast were derived
solely from organic detritus, both marine and terrestrial, of the same
ages. However, circumstantial evidence indicates that a significant source
of organic carbon for methanogenesis is provided by petroleum that frequently
seeps into surface sediments. The relative scales of methane generation
from these competing sources cannot yet be established. |
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