| An oil producing limestone reservoir of Wolfcampian age in the Eastern shelf of the Permian Basin, Texas is characterized through acoustic impedance inversion and simultaneous inversion. The spatial distribution of Moran limestone was estimated from P-wave and S-wave (Ip and Is) impedance volumes, from which Vp/Vs and Lamé attributes (λρ and μρ) volumes were derived. Results of the acoustic impedance inversion indicate that Ip alone will not distinguish limestone from sandstone within the study area. Vp/Vs and Ip attributes from the simultaneous inversion will distinguish limestone from sandstone and shale, and indicate 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 up dip direction. The results also show the effect of a water flood within the producing field, potential for further drilling within the field, and other potential oil saturated limestone reservoirs missed by previously exploration. |
