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Book Chapter

Paleozoic Examples

Published:
January 01, 1988

Abstract

The Penwell, Jordan, Waddell, Dune, McElroy (P.J.W.D.M.) Field Complex of Ector, Crane, and Upton Counties, Texas, is a single giant oil field which, because of separate initial field discoveries, is divided into five fields. Production is from Guadalupian San Andres and Grayburg carbonate reservoirs. The original oil in place in this giant field complex is calculated to be 4,100 million barrels, cumulative production is more than 800 million barrels, and 900 million barrels of mobile oil will remain after conventional primary and secondary recovery.

The P.J.W.D.M. Field Complex is located on the Central Basin Platform in the Permian Basin of West Texas and Southeast New Mexico. San Andres and Grayburg sediments were deposited as an upward-shoaling sequence of low-energy ramp sediments. The lower, marine portions of both formations contain pellet and skeletal grainstone and skeletal wackestone with normal marine fauna. The upper, peritidal portions of both formations contain mudstone and pisolite packstone/grainstone characterized by desiccation features and sulfate cements. The section has been thoroughly dolomitized and contains anhydrite partially hydrated to gypsum.

The trap is a low, broad anticline formed by compaction deformation over a buried Pennsylvanian fault system. The reservoir zones are primarily dolomitized subtidal grainstones, and the seals are fine-grained supratidal and peritidal dolomite plugged with sulfate cements. Linear grainstone trends impart lateral heterogenity to these reservoirs, and because they contain a concentration of remaining mobile oil, these features are targets for infill drilling.

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Contents

SEPM Core Workshop Notes

Giant Oil and Gas Fields: A Core Workshop

Anthony J. Lomando
Anthony J. Lomando
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Paul M. Harris
Paul M. Harris
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SEPM Society for Sedimentary Geology
Volume
12
ISBN electronic:
9781565761001
Publication date:
January 01, 1988

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