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AAPG Bulletin, Preliminary version published online Ahead of Print 5 December 2024.

Copyright © 2024. The American Association of Petroleum Geologists. All rights reserved.

DOI:10.1306/10072423060

Characterization of oils and potential source rocks in the Marietta Basin, Oklahoma and Texas

R. Paul Philp, Richard J. Brito, and Dallas Cook

School of Geosciences, University of Oklahoma, Norman, OK. 73019

Ahead of Print Abstract

Oils and hydrocarbon source rocks from the Anadarko Basin in Oklahoma have been studied extensively for many decades and results from multiple studies have been published. The major source rock in the basin is the Upper Devonian Woodford Shale, although there are several other source rocks that have contributed to oils in the Basin. The adjoining Marietta Basin, although of similar age and containing many of the same formations present in the Anadarko Basin, has received relatively little attention and limited geochemical data have been published on the Woodford Shale and Viola Limestone in the Marietta Basin. This study will focus on the geochemical characterization of a Woodford core and 19 produced oils from the Marietta Basin.

The Woodford Shale has excellent hydrocarbon source potential in the Marietta Basin but is not the sole source of all the oils. Geochemical evidence exists to show that many oils are mixtures of Upper Devonian Woodford and Ordovician Viola sources. Viola oils and rock extracts have very characteristic geochemical signatures, including a pronounced odd/even n-alkane distribution in the n-C10-C20 range; presence of methylhopanes; and presence of 1,2,8-trimethylphenanthrene that is virtually absent from the Woodford. It is possible to distinguish oils that are solely sourced from the Woodford from those that are mixtures based on these characteristics. Information such as this will be invaluable for future exploration efforts knowing that the majority of oils in the basin are mixtures rather than being sole-sourced.

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Please cite this AAPG Bulletin Ahead of Print article as:

R. Paul Philp, Richard J. Brito, Dallas Cook: Characterization of oils and potential source rocks in the Marietta Basin, Oklahoma and Texas, (in press; preliminary version published online Ahead of Print 05 December 2024: AAPG Bulletin, DOI:10.1306/10072423060.

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