AVO of properly processed prestack seismic data depends upon the angle of incidence of seismic waves to an interface and on the relative changes of the physical properties (P- and S-wave velocities and densities) across the interface as defined by the Zoeppritz equations. The information that can be extracted from prestack seismic is then, at best, related to these physical properties and the estimation, from seismic data, of petrophysical properties such as porosity, lithology or pore fluids has to be done through a link, provided by rock physics, between attributes related to velocities and density and the petrophysical property being...

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