Building on recent research efforts towards high resolution multi-parameter inversion for reservoir characterization, we formulate a rock physics parameterization scheme for elastic full-waveform inversion (EFWI). Within a suitably-formed multi-parameter EFWI scheme, in this case a 2D frequency domain isotropic-elastic formulation with truncated Gauss-Newton optimization, any rock physics model with a welldefined mapping between its parameters and seismic velocity/ density can be examined. We select a three-parameter porosity, clay content, and water saturation (PCS) parameterization, and link them to elastic properties through each of three representative rock physics models: the Han empirical model, the Voigt-Reuss-Hill (VRH) boundary model, and the Kuster and Toks¨oz (KT) inclusion model. Numerical examples are suggestive that conditioning issues making a sequential approach (in which the PCS parameters are determined from inverted velocities and density) unstable are avoided in this direct approach. Water saturation tends to be the most difficult property to recover in all situations examined; scattering radiation pattern analysis indicates that very low relative scattering amplitudes from perturbations in this property exist.
Presentation Date: Wednesday, October 14, 2020
Session Start Time: 1:50 PM
Presentation Time: 2:15 PM
Location: Poster Station 3
Presentation Type: Poster
