Spherical Wave AVO Modeling of Converted Waves in Isotropic Media

Summary The AVO-response of two-layer isotropic models for AVO-Classes 1 and 3 is investigated for converted waves. Zoeppritz’s reflection coefficients and the Weyl-integral are utilized for the computations. Spherical wave results for Rps and Rpp are compared with plane wave reflectivity. Depth dependence of spherical wave AVO is found to be strongest near critical angles of Class 1. There is some similarity between Rps and Rpp for Class 1. Normalized Class 3 responses show no depth dependence. There is no similarity between Class 3 Rps and Rpp . Attenuation reduces AVO-response magnitudes. Rps appears to be more sensitive to finite Q-factors than is Rpp.