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An Integrated 3-D Gravity and Seismic Study of the Ouachita Frontal Thrust Belt, Pittsburg and Latimer Counties, Oklahoma

By
Holly Hunter-Huston
Holly Hunter-Huston
Hunter 3-D Inc., Houston, Texas, USA
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E. F. Greene
E. F. Greene
Gene Greene & Associates, Houston, Texas, USA
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C. L. V. Aiken
C. L. V. Aiken
University of Texas at Dallas, Texas, USA
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Published:
January 01, 1998

Abstract

The study area is located in the Ouachita frontal thrust belt between the Choctaw thrust fault and the Ti Valley thrust fault in Pittsburg and Latimer Counties, Oklahoma (Figure 1). Although previous studies are available on the compressional structures in this area, few studies have analyzed the deep Ordovician extensional structures we focused on. A detailed gravity survey was acquired to complement an existing 3-D seismic survey shot by Texaco and Weeks Exploration. The seismic data set is ambiguous at the Ordovician level; 3-D gravity modeling proved to be critical in confirming large, deep structural highs within these strata.

Deep extensional structures of the Ouachita frontal thrust belt were developed during Precambrian rifting that created the Arkoma Basin shelf. Reactivation along these basement faults tilted and truncated the section during post-Hunton time, causing erosion of the Hunton Group in many parts of the Arkoma Basin and Ouachita overthrust belt (Tilford, l990). These faults are characterized by localized horst and graben features. On seismic data, some of these faults appear to be high-angle thrust faults. The throw probably was reversed during the period of Ouachita Mountain overthrusting (Tilford, l990; Valderrama, 1994).

Compressional structures of the Ouachita frontal thrust belt are comprised of deep and shallow regimes. These structures formed during the compression of the Ouachita Mountains overthrust orogeny in late Atokan through Des Moinesian time (Arbenz, l989). The shallow compressional structures consist of asymmetric north-verging faults. Most of these faults become listric at depth and parallel the Choctaw and Ti Valley thrust faults. Deeper compressional structures

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Contents

Society of Exploration Geophysicists Geophysical References Series

Geologic Applications of Gravity and Magnetics: Case Histories

Richard I. Gibson
Richard I. Gibson
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Patrick S. Millegan
Patrick S. Millegan
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Society of Exploration Geophysicists
Volume
8
ISBN electronic:
9781560801832
Publication date:
January 01, 1998

GeoRef

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