Frequency‐dependent AVA variations in thinly layered porous media

Abstract

Amplitude-Versus-Offset (AVO) technology has successfully helped to detect hydrocarbon reservoir for more than two decades. However, the Zoeppritz equation only considers the elastic properties of the media, the nonelastic behaviors are ignored. There are still some problems that the traditional AVO technology doesn't handle adequately. Although the frequency-dependent AVO technology has been brought forward, a theory is lacking to guide it. Based on White's patchy saturation model, we have investigated characteristics of the frequency dependent Amplitude Versus incident-Angle (AVA) at an interface between a non-dispersive medium and a patchysaturated dispersive medium. And then, numerical modeling based on Biot's poroelastic wave theory was performed on three selected reservoir models. The numerical modeling results confirmed our analytical analysis. These variations could provide insight for frequency-dependent AVO analysis.