Structural interpretation of Paleozoic strata as part of the transition zone in the Wilburton gas field using 3D seismic, Hartshorne, Higgings, Adamson and Gowen quadrangles, southeastern Oklahoma, Arkoma Basin

Scope and method of study. The purpose of this study is to carry out structural interpretations of the duplex structure and other Paleozoic strata associated with the triangle zone between the frontal Ouachita Mountains and the Arkoma Basin using 3D seismic data. Interpretations were done using SMT Kingdom Suite 7.5.; Findings and conclusions. The study area can be divided into three distinct structural regimes, the duplex regime, the shallow regime and a deep regime. The horses associated with the duplex are not a continuous mass of Spiro-Wapanucka strata, but are segmented by multiple back thrusts. Shortening calculations for the duplex structure reveal shortenings of 22 to 29%, and calculations for the back thrusts reveal shortenings of 4 to 6%. The shallow regime contains a Middle Atokan Thrust and multiple back thrusts. Normal faults dominate the deep regime with the horst blocks acting as ramping mechanisms for the horses and unthrusted Spiro located in the grabens. There is some evidence of thrusting in the deep regime.