Deans, J.D. and McMechan, G.A., 2012. Simultaneous inversion of 3D seismic data from a Wolfcampian reservoir in the eastern shelf of the Permian Basin, U.S.A. Journal of Seismic Exploration, 21: 105-123. An oil producing limestone reservoir of Wolfcampian age in the eastern shelf of the Permian Basin, Texas is characterized through simultaneous impedance inversion. The spatial distribution of Moran limestone is estimated from P-wave and S-wave (I, and Is) impedance volumes, from which Vp/Vs and Lamé attribute (Ap and yp) volumes are derived. I, alone will not distinguish limestone from sandstone within the study area. Vp/Vs and I, attributes from the simultaneous inversion will distinguish limestone from sandstone and shale, and allow estimates of oil saturations. The Lamé parameter attributes also identify lithology and indicate oil saturations. A vertical section through a potential reservoir area predicts oil saturation grading vertically toward the top of the reservoir, and also in the updip direction. The results also show the effect of a water flood within the producing field and other potential oil-saturated limestone reservoirs missed by previous exploration. The main conclusion is that the (Ap and yp) attributes previously used for analysis of gas reservoirs in clastics are equally valuable for oil reservoirs in carbonates.