Abstract
VeritasDGC. Summary We present a new approach to the simultaneous pre-stack inversion of PP and, optionally, PS angle gathers for the estimation of P-impedance, S-impedance and density. Our algorithm is based on three assumptions. The first is that the linearized approximation for reflectivity holds. The second is that PP and PS reflectivity as a function of angle can be given by the Aki-Richards equations (Aki and Richards, 2002). The third is that there is a linear relationship between the logarithm of P-impedance and both S-impedance and density. Given these three assumptions, we show how a final estimate of Pimpedance, S-impedance and density can be found by perturbing an initial P-impedance model. After a description of the algorithm, we then apply our method to both model and real data sets.
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