This study combines the technique of amplitude variations with offset, or AVO, analysis with the theory of poroelasticity to derive a linearized AVO approximation that provides the basis for the estimation of fluid, rigidity and density parameters from the weighted stacking of pre-stack seismic amplitudes. The method proposed is a generalization of the two AVO approximations introduced by Gray et al. (1999) using the formulation introduced by Russell et al. (2003). After a review of linearized AVO theory, we present the theory of our approach. We then apply our method to both model and real datasets.
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