Abstract

Pre stack inversion is the key tool for quantitative seismic reservoir characterization. The delineation of hydrocarbon bearing geo-bodies through quantitative seismic reservoir characterization has been widely used in industry. The elastic logs like density (Rhob), compressional wave velocity (Vp) and shear wave velocity (Vs) are required inputs in pre stack inversion and AVO studies. Generally, shear wave velocity logs are either not available or may be affected by bad borehole condition, mud filtrate invasion and sudden lithological changes. The shear wave velocity is required to be predicted through rock physics modelling (RPM) based upon a comprehensive petrophysical evaluation. Rock physics creates a link between elastic rock properties (compressional & shear velocities, elastic moduli, poisson ratio etc.), petrophysical properties (porosity, water saturation, mineral volumes) and geological environment