Inversion and interpretation of a 3D seismic data set from the Ouachita Mountains, Oklahoma Available to Purchase

Acoustic impedance inversion (AI) and simultaneous angle-dependent inversion (SADI) of a 3D seismic data set characterize reservoirs of Mississippian Morrowan age in the triangle zone of the frontal Ouachita Mountains, Oklahoma. Acoustic impedance of the near-angle seismic data images the 3D spatial distributions of Wapanucka limestone and Cromwell sandstone. Lamé $parameters×density$ (⁠$λρ$ and $μρ$⁠) and $λ/μ$ sections are derived from the P-wave and S-wave impedance (⁠$IP$ and $IS$⁠) sections produced by the SADI. Lithology is identified from the gamma logs and $μρ$⁠. The $VP/VS$⁠, $λρ$⁠, and $λ/μ$ are interpreted in terms of a hydrocarbon distribution pattern. The $IP$ is used to identify high $IP$ regions that are consistent with high sand/shale ratio. The estimated impedances and derived Lamé parameter sections are consistent with the interpretation that parts of the Wapanucka limestone and Cromwell sandstone contain potential gas reservoirs in fault-bounded compartments. The Cromwell sandstone contains the main inferred reservoirs; the two largest of these are each $∼1×107m3$ in pore volume. The inversion results also explain the observed low production in previous wells because those did not sample the best compartments. We propose a single new well location that would penetrate both reservoirs; 3D visualization facilitates this recommendation.