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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 54 (1970)

Issue: 5. (May)

First Page: 869

Last Page: 869

Title: Pennsylvanian Deltaic Stratigraphic Traps, Eastern Shelf, Midland Basin, Texas: ABSTRACT

Author(s): John P. Shannon, Jr.

Article Type: Meeting abstract


Hydrocarbon occurrence in Strawn (Pennsylvanian) sandstones in the West Tuscola field, near Abilene, Texas, is the result of stratigraphic entrapment in deltaic Previous HitsandstoneNext Hit. The origin of the Previous HitreservoirNext Hit rock in the field area and the overall geometry and internal character of the deltaic complex were determined from the vertical sequence in numerous cores of the Previous HitreservoirNext Hit Previous HitsandstoneNext Hit and associated units and from numerous E-logs of uncored wells.

The vertical succession of deltaic facies consists from base to top of a progradational sequence (pro-delta and delta-front), an aggradational unit (delta plain, marsh, and interdistributary bay), and an overlying "transgressive" shallow-marine interval. Previous HitReservoirNext Hit sandstones are present within the delta-front facies as stream-mouth-bar deposits, known locally as the "Grey Previous HitsandstoneNext Hit."

The stream-mouth-bar Previous HitsandstoneNext Hit in the West Tuscola Previous HitreservoirNext Hit is lenticular, highly irregular in outline, and has varied trends of Previous HitporosityNext Hit; these are characteristics common to deltaic deposits. Such features present problems in developing effective secondary-recovery methods and in Previous HitpredictingTop occurrences of other deltaic sandstones.

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