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The AAPG/Datapages Combined Publications Database
Journal of Petroleum Geology
Abstract
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Journal of Petroleum Geology, Vol.
EXPULSION
CRITERION IN
THE EVALUATION OF THE PETROLEUM SOURCE BEDS OF THE TERTIARY NIGER
DELTA
* Department of Geology, University of Benin, Benin City, Nigeria. Present address: Shell Pet. Dev. Co. Nigeria Ltd, EPDE EXPE, PO Box 263, Port Harcourt, Nigeria.
Abstract
hydrocarbon
ratios with
depth for four wells in the offshore Niger Delta show that
hydrocarbon
expulsion
has occurred at an interval shallower than
the geochemically-accepted top of the oil-generative window
(OGW). This shallow
expulsion
zone, which spans the maturation
range 0.3-0.6% Ro, is related to the transformation of resinite- and
sporinite-rich organic matter to hydrocarbons. The deeper
generation/
expulsion
zone (conventional OGW) has not released its
generated hydrocarbons, presumably because of overpressure
development.
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