Linear and non-linear AVO for poroelastic targets

Steven M. Kim, Kristopher A. H. Innanen

AVO techniques permit the variations in seismic amplitudes with angle or offset to be used to deduce subsurface target properties. Linearized AVO is parameterized in several different ways. One, introduced this year focuses on changes in the P-wave reflection strength associated with poroelastic medium variations. In this paper we review a newly proposed poroelastic AVO technique, and reproduce the methodology and basic conclusions of those authors. We formulate the poroelastic AVO inverse problem in terms of least-squares, and take some initial steps towards extending the model to nonlinear (i.e., large contrast) regimes.