--> --> ABSTRACT: Fracture Density and Spacing Along Washita Valley Fault, Arbuckle Mountains, Oklahoma, by C. D. Ferebee and J. B. Tapp; #91025 (2010)
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Fracture Density and Spacing Along Washita Valley Previous HitFaultNext Hit, Arbuckle Mountains, Oklahoma

C. D. Ferebee, J. B. Tapp

We document fracture density and spacing associated with the Washita Valley Previous HitfaultNext Hit, a major strike-slip Previous HitfaultNext Hit. The Washita Valley Previous HitfaultNext Hit strikes northwest-southeast with up to 80 mi of exposure in southern Oklahoma and may be an early bounding Previous HitfaultNext Hit of the Southern Oklahoma aulacogen (Ardmore/Marietta basins). Horizontal displacement on the Previous HitfaultNext Hit has been estimated to be up to 40 mi, with vertical displacement on the order of 10,000 ft.

Samples collected from traverses across the Washita Valley Previous HitfaultNext Hit have been analyzed. The traverses cross the Previous HitfaultNext Hit at different stratigraphic levels from Proterozoic igneous basement, through the Cambrian-Ordovician Arbuckle Group, Ordovician Simpson and Viola Groups, to the Silurian-Devonian Hunton Group. Several types of fracture systems are documented that reflect mechanical stratigraphy, burial depth during deformation, and episodic movement on the Previous HitfaultNext Hit. The fractures in the study area include open fracture systems, calcite-filled fractures, tension gashes, and fractures related to pressure solution.

The samples were cut parallel to the strike of the Previous HitfaultNext Hit, vertical-normal to the Previous HitfaultNext Hit, and horizontal-normal to the Previous HitfaultNext Hit. These cuts allow examination of the total fracture strain, characterization of the fractures, and statistical analysis of fracture density. From these data, fracture density is shown to decrease exponentially moving away from the primary Previous HitfaultTop zone.

The increased understanding of fracture patterns and characteristics will assist future exploration and development programs involving carbonate reservoirs associated with strike-slip systems.

AAPG Search and Discovery Article #91025©1989 AAPG Midcontinent, Sept. 24-26, 1989, Oklahoma City, Oklahoma.