In this paper we present a modification to the AVO equation. Two geophysical parameters ⌂I/I and ⌂K/K (the zero offset P-wave reflectivity and a scaled version of the zero offset Swave reflectivity respectively) are estimated from the variation of amplitude with offset. It is demonstrated on a synthetic data set how lithology and pore fluid are predicted from these parameters, and a case history from offshore South Africa is shown.
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Gidlow et al. (1993) studied this question.