Estimation of the anisotropy parameters from imaging moveout of diving wave in a factorized anisotropic medium
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
Earth Science and Engineering Program
Astronomy and Geophysical Research Institute
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AbstractThe importance of diving waves is being realized because they provide long-wavelength model information, which can be used to help invert for the reflection information in full-waveform inversion. The factorized model is defined here as a combination of vertical heterogeneity and constant anisotropy, and it admits closed-form description of the traveltime. We have used these resulting analytical formulas to describe the behavior of diving waves in a factorized anisotropic medium, and we used an approximate imaging moveout formulation (residual moveout after imaging) to update the velocity model when the wrong model parameters (isotropic assumption) were used for imaging. We then used these analytical representations of the image moveout to establish a semblance analysis framework to search for the optimal anisotropic parameters. We have also discussed different parameterizations of the factorized medium to find the one that gave the best accuracy in anisotropy parameters estimation.
CitationEstimation of the anisotropy parameters from imaging moveout of diving wave in a factorized anisotropic medium 2016, 81 (4):C139 GEOPHYSICS
SponsorsWe would like to thank W. Weibull for providing the modeling and RTM codes and C. Wang from Tongji University for his useful discussions. We acknowledge the China Scholarship Council and the ROSE Project for financial support and KAUST for its support. We also would like to acknowledge the associate editor and the reviewers for their instructive comments.
PublisherSociety of Exploration Geophysicists