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Facies Belts, Microfacies, and Karst Features of the Ellenburger Group, Kerr Basin, Texas: Observations Based on Cores

By
Richard C. Geesaman
Richard C. Geesaman
Geologic Consultant, Boulder, Colorado, U.S.A.
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James Lee Wilson
James Lee Wilson
Consultant, New Braunfels, Texas, U.S.A.
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Published:
January 01, 2012

Abstract

The carbonate-dominated strata of the Lower Ordovician Ellenburger Group have an excellent potential for containing significant reserves of hydrocarbons in the sparsely explored Kerr Basin of southwestern Texas. The Kerr Basin is located east of and adjacent to the Val Verde Basin and is characterized by asimilar tectonic history and resultant structural style. Moreover, the Ellenburger strata in the Kerr Basin consist of numerous stacked upward-shallowing parasequences similar to those making up the Ellenburger Groupin the Val Verde Basin. Karst-related dissolution and collapse overprint much of the Ellenburger carbonates, locally resulting in porous breccias, cave fill, and/or fractured cave roofs. In summary, the Ellenburger strata of the Kerr Basin were deposited in similar environments, are composed of the same lithologic components, and have been exposed to similar diagenetic processes as equivalent strata in the adjacent Val Verde Basin. Therefore, a strong likelihood exists that reservoir-quality porosity and permeability will be preserved in the subsurface and that these reservoirs will be hydrocarbon productive in structural closures in this frontier basin.

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Contents

Memoir

Great American Carbonate Bank: The Geology and Economic Resources of the Cambrian—Ordovician Sauk Megasequence of Laurentia

James Derby
James Derby
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Richard Fritz
Richard Fritz
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Susan Longacre
Susan Longacre
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William Morgan
William Morgan
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Charles Sternbach
Charles Sternbach
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American Association of Petroleum Geologists
Volume
98
ISBN electronic:
9781629810201
Publication date:
January 01, 2012

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