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Book Chapter

Karst Breccias in the Madison Limestone (Mississippian), Garland Field, Wyoming

By
A. Serdar Demiralin
A. Serdar Demiralin
Colorado School of Mines Golden, Colorado
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Neil F. Hurley
Neil F. Hurley
Marathon Oil Company Littleton, Colorado
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Thomas W. Oesleby
Thomas W. Oesleby
Marathon Oil Company Cody, Wyoming
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Published:
January 01, 1993

Abstract

Garland field is an asymmetric anticlinal trap located in the north-central Big Horn basin, Wyoming. The field produces hydrocarbons from interlayered, fractured limestones and dolomites of the Madison Limestone (Mississippian). Significant karstification occurs in the form of field-wide intraformational breccias and locally developed cavernous porosity. Most breccias and caverns apparently formed during prolonged post-Madison exposure, prior to deposition of the overlying Darwin Sandstone.

Three types of karst breccia occur: (1) red, siltstone-matrix breccias, (2) clay-matrix breccias, and (3) dolomicrite-matrix breccias. Red, siltstone-matrix breccias occur in the upper 30 ft (9 m) of the Madison, and are related to the exposure event at the top-of-Madison unconformity. Clay-matrix breccias form a regionally correlatable layer which is about 50 ft (15 m) thick in the Garland field area. These breccias, which occur roughly 200 ft (60 m) below the top of the Madison, probably formed by evaporite dissolution and subsequent collapse. Dolomicrite-matrix breccias occur at the tops of shallowing-upward sequences at several levels within the Madison, and they apparently pre-date clay-matrix breccias. Dolomicrite-matrix breccias may have formed during periodic intraformational exposure events.

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Contents

SEPM Core Workshop Notes

Paleokarst Related Hydrocarbon Reservoirs

Richard D. Fritz
Richard D. Fritz
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James L. Wilson
James L. Wilson
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Donald A. Yurewicz
Donald A. Yurewicz
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SEPM Society for Sedimentary Geology
Volume
18
ISBN electronic:
9781565762701
Publication date:
January 01, 1993

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