Resolving Ambiguity in AVO and AVAz Inversion

The AVO and AVAz contain valuable information about the elastic properties of a subsurface media. However, the conventional approaches are based on plane-wave theory, which cannot explain observations near the acoustic critical reflection and far offset null reflection at Rayleigh angle. In this contribution, we show our algorithm to understand the acoustic reflectivity of liquid-solid boundary in different incidental and azimuthal directions. This algorithm is a hybrid approach that propagates the wavefield into the space, in frequency domain and reflect each wavenumber with respective reflection coefficient. We used this technique to model the P-wave reflectivity from water-aluminum and waterPhenolic CE interface and then compared it with the observed data against the predicted solution. By accounting for all the interferences and complexities of the reflected wave, this algorithm is able to explain the biases from AVO and AVAz observation inherent in the plane-wave solution.