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Abstract
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Geochemical
Study of  Potential Source Rocks and Crude Oils in the Anadarko Basin, Oklahoma1Huai Da Wang2 and
R. Paul Philp3 |
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| ABSTRACT
Paleozoic source rocks and crude
oils from the Anadarko basin, Oklahoma, have been characterized by means
of a variety of organic geochemical techniques. The potential source rocks
investigated include the Viola Group, Sylvan Shale, Lower Mississippian
limestone, Chester group, Springer Formation, and Morrow group. The Woodford
Shale, which is an important source rock in the basin and has been discussed
extensively in the literature, was used as a laboratory standard in this
study. The crude oils examined in this study were obtained from reservoir
formations of various ages from throughout the basin.
The source rock screening analysis indicates
that the lower and middle subfacies of the Viola, especially from the southeastern
part of the basin, have substantial oil-generation potential. The Sylvan
is not a source rock, although the black shales in the Springer and Morrow
have substantial oil- and especially gas-generation potential. The results
of this study support the proposal for multiple sources of oil and gas
generation in the Anadarko basin.
Selected source rock and oil samples were
characterized in more detail, and the distributions and concentrations
(both relative and absolute concentrations) of biomarkers in different
source rocks and oils were determined. The biomarker characteristics were
combined with other geochemical and geological data to interpret the sources,
depositional environments, diagenesis and catagenesis processes, migration,
and weathering. Oilsource rock correlations were made between source
rocks and a number of crude oils based on quantitative and qualitative
biomarker distributions.
Petrographic descriptions and graptolite
reflectance measurements were used to evaluate
©Copyright
1997. The American Association of Petroleum Geologists. All rights reserved. 1Manuscript
received November 1, 1995; revised manuscript received April 8, 1996; final
acceptance September 13, 1996.
2ARCO
International Oil and Gas Company, 2300 W. Plano Parkway, Plano, Texas
75057.
3School
of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73019. |
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