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The AAPG/Datapages Combined Publications Database
Journal of Petroleum Geology
Abstract
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Journal of Petroleum Geology, Vol.
* Gulf Oil Exploration and
Production Company, Houston Technology Center, Houston, Texas.
Present address: Chevron USA Inc., PO Box 599, Denver, CO 80201,
USA.
Abstract
marine
geology
and sedimentology shows that chalk could be a source of
hydrocarbons, and that some hydrocarbons in some chalk reservoirs
could have originated within the chalk. Coccolith ooze, the
precursor of chalk, is deposited as the fecal (faecal) pellets of
zooplankton, most probably copepods. These fecal pellets contain
dihydrophytol which is a precursor of pristane;the latter is a
precursor of some crude oil deposits. Zooplankton fecal pellets
probably provided the organic source for some of the hydrocarbons
in chalk. Some hydrocarbons in
marine
-and lacustrine-shale source
rocks could have originated in much the same way.
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