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Shannon Sandstone Hartzog Draw Field Core Study

By
R. W. Tillman
R. W. Tillman
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R. S. Martinsen
R. S. Martinsen
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Published:
January 01, 1985

Abstract

Hartzog Draw field is a stratigraphically controlled oil reservoir which produces from the Upper Cretaceous Shannon Sandstone at depths from 9000 to 9600 feet. The producing interval consists of a large mid-shelf sand-ridge (bar) complex deposited below effective normal wave base more than 100 miles from shore. The productive (net pay) interval in the bar complex has a maximum thickness of 60 feet, is 22 miles long, and is one to four miles wide. The field was discovered in 1975 and 177 producing wells were completed on 160 acre spacing during the primary production phase of development. Initial oil in place was calculated to be 350,000,000 barrels.

The shelf sand-ridge complex is competely enveloped in shale, has a solution gas drive, no water table and no produced formation water. Net pay is primarily a product of porosity, permeability and thickness of the sandstone, and is related primarily to sedimentary facies and the degree of diagenesis.

Of the six to eight facies observed in cores, only one, the Central Ridge Facies, a high-angle trough cross-bedded glauconitic quartz sandstone, is consistently high-quality reservoir. Two others, High-Energy Ridge-Margin Facies, a predominantly trough cross-bedded highly glauconitic sandstone with abundant shale and siderite clasts, and Low-Energy Ridge-Margin Facies, inter-bedded trough and rippled sandstone, also may be good quality reservoirs. Inter-Ridge Facies which consist of rippled interbedded sandstone and shale, generally are poor quality to non-reservoirs.

Values from the Central Ridge Facies from three of the cores taken early in the development of the northern part

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Contents

SEPM Short Course Notes

Shelf Sands and Sandstone Reservoirs

R. W. Tillman
R. W. Tillman
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D. J. P. Swift
D. J. P. Swift
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R. G. Walker
R. G. Walker
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SEPM Society for Sedimentary Geology
Volume
13
ISBN electronic:
9781565762428
Publication date:
January 01, 1985

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