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Oolitic Tidal-Bar Reservoirs in the Mississippian Greenbrier Group of West Virginia

By
Gregory T. Kelleher
Gregory T. Kelleher
CNG Producing Company New Orleans, Louisiana, USA
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Richard Smosna
Richard Smosna
Department of Geology & Geography West Virginia University Morgantown, West Virginia, USA
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Published:
January 01, 1993

Abstract

In the Rhodell field of southern West Virginia, initial potentials of oolitic reservoirs in the Greenbrier Group commonly exceed 2.0 MMCFGD of natural gas. The major reservoir, an oolitic member of the Union Limestone, stands out as distinct northwest-trending thicks, comparable in size, shape, and location to modern tidal bars. They formed along the hinge line that separated a rapidly subsiding basin from a stable shelf. Individual bars have 15-30 ft (4.6-9.1 m) of net thickness with greater than 6% porosity, and the producing zones are ooid grainstones with a mean log porosity of 9.5% and permeability of up to 0.15 md. Ooids were generally altered to microrhom- bic low-magnesium calcite during meteoric diagenesis and developed considerable intragranular microporosity. Reservoir permeability is greatly enhanced where ooids have undergone chemical compaction, which produced long contacts between neighboring microporous grains.

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Contents

AAPG Studies in Geology

Mississippian Oolites and Modern Analogs

Brian D. Keith
Brian D. Keith
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Charles W. Zuppann
Charles W. Zuppann
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American Association of Petroleum Geologists
Volume
35
ISBN electronic:
9781629811017
Publication date:
January 01, 1993

GeoRef

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