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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 69 (1985)

Issue: 8. (August)

First Page: 1320

Last Page: 1320

Title: Recognition and Correlation of Morrowan-Age Wash Reservoirs in Roger Mills and Beckham Counties, Oklahoma: ABSTRACT

Author(s): David M. Sturm, Keith L. Talley, Alan R. Carroll

Article Type: Meeting abstract

Abstract:

Upper Morrowan-age "washes" in Roger Mills and Beckham Counties, Oklahoma, are prolific yet elusive targets for exploration and production geologists. Hydrocarbon reserves can average 14 bcf of gas/well from net reservoir sand thicknesses of less than 20 ft; however, precise sand trends are difficult to predict consistently. This unpredictability is directly related to the complex depositional history of the wash sediments. Upper Morrowan-age washes represent the initial sedimentary response to uplifting, overthrusting, and erosional unroofing of the ancestral Wichita Mountains. Prograding fan deltas largely overwhelmed normal basin sediments close to the mountain front. Farther basinward, interfingering of the two systems led to rapid vertical and lateral facies changes ithin the wash sequence.

Successful exploration in this sequence depends on recognition of reservoir facies and physical distribution, along with an understanding of the evolutionary nature of the wash sedimentary environment. Detailed correlation of individual sand bodies within the wash is essential. Core and cuttings data may then be integrated with log response to determine sand facies and reservoir characteristics. Reservoir quality is highly dependent on diagenetic history. High-resolution stratigraphic seismic control is useful in delineating sand trends. All available information should be integrated in an overall sedimentary response model for the area that reflects the structural and depositional evolution of the wash sedimentary wedge from its mountain front source to its distal basinward margin. >

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