Full-waveform inversion in anisotropic media using reflected waves suffers from the strong non-linearity of the objective function and trade-offs between model parameters. Estimating long-wavelength model components by fixing parameter perturbations, referred to as reflection-waveform inversion (RWI), can mitigate nonlinearity-related inversion issues. Here, we extend RWI to acoustic VTI (transversely isotropic with a vertical symmetry axis) media. To minimize trade-offs between the model parameters, we employ a new hierarchical two-stage approach that operates with the P-wave normal-moveout velocity and anisotropy coefficents and . First, is estimated using a fixed perturbation in , and then we invert for by fixing the updated perturbation in . The proposed 2D algorithm is tested on a horizontally layered VTI model.
Presentation Date: Wednesday, October 19, 2016
Start Time: 8:25:00 AM
Presentation Type: ORAL