Two-steps two-parameters joint PP and PS waves AVO inversion

Abstract

For the oil and gas exploration and development, three parameters AVO inversion is an important interpretation method for lithology and hydrocarbon prediction. However, the accuracy of the result is a challenging problem. In this paper, we carry out a study on two parameters joint PP and PS waves AVO inversion. We firstly get the PP wave velocity by Stewart’s reflection coefficient approximation. Secondly, we substitute the calculated P wave velocity into the Aki-Richards’s three parameters inversion approximation, and finally we construct a new joint PP and PS waves reflection coefficient equation containing S wave velocity and density parameters. Combing the above inversion procedures, we develop the two parameters joint inversion procedure using least-squares estimation. Numerical tests show that two parameters joint AVO inversion by two steps are better than three parameters joint AVO inversion in the aspects of accuracy and effectiveness of hydrocarbon indication. So the proposed inversion method can be applied in the prediction of lithology and hydrocarbon.