Abstract

Rock-property-related attributes are easier to interpret than seismic reflectivity, which is related to interface between zones of contrasting mechanical properties. Inversion of seismic reflection data for various lithological and petrophysical attributes is used broadly to characterize reservoirs and to predict pore fluids. The P-wave acoustic impedance provides the initial basis for constructing such attributes, and its S-wave counterparts and related properties like Poisson impedance reveal AVO properties in pre-stack seismic data. In the present work, pre-stack inversion study was carried out in an area having 22 wells. But elastic logs were available in only 13 wells of which only one well was having shear sonic log. Shear sonic logs were predicted using multi attribute regression for remaining wells. Detailed rock physics analysis and Simultaneous angle dependent inversion were carried out to have an understanding of the likely anomaly for hydrocarbon bearing sediments. Rock physics analysis indicates that histogram of P-impedance doesn