![]() The overall correlation coefficient between the inverted and actual impedance was about 98% across the eight wells. Crossplot analysis of Poisson and Vp/Vs ratio against acoustic impedance revealed Poisson ratio range of 0.30–0.45 and V p/ V s ratio range of 1.3–2.50 within the delineated hydrocarbon-bearing sandstone interval. The inversion results revealed an acoustic impedance range of 9700–25,000 ft/s g/cc and porosity range of 25–45% within the hydrocarbon-bearing sands. Four major antithetic, three regional, and five minor faults were identified. The study entailed mapping of structural framework, horizon picking, wavelet extraction, log editing and correlation, building of low-frequency model, acoustic impedance inversion and crossplot analysis of reservoir properties. Post-stacked 3D seismic data, composite well logs, and velocity checkshot data were used for the reservoir analysis. Structural interpretation and inversion analysis were used to characterize hard-to-image reservoirs, to predict subsurface interwell reservoir properties for optimum reservoir heterogeneity description, and to fine-tune drilling locations in ‘DJ’ Field, Niger Delta.
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