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AbstractA major challenge for multiparameter full-waveform inversion (FWI) is the inherent trade-offs (or cross-talk) between model parameters. Here, we perform FWI of multicomponent data generated for a synthetic VTI (transversely isotropic with a vertical symmetry axis) model based on a geologic section of the Valhall field. A horizontal displacement source, which excites intensive shear waves in the conventional offset range, helps provide more accurate updates to the SV-wave vertical velocity. We test three model parameterizations, which exhibit different radiation patterns and, therefore, create different parameter trade-offs. The results show that the choice of parameterization for FWI depends on the availability of long-offset data, the quality of the initial model for the anisotropy coefficients, and the parameter that needs to be resolved with the highest accuracy.
CitationKamath N, Tsvankin I, Diaz E (2016) Elastic FWI for VTI media: A synthetic parameterization study. SEG Technical Program Expanded Abstracts 2016. Available: http://dx.doi.org/10.1190/segam2016-13820100.1.
SponsorsWe thank the members of the A(nisotropy)- and i(maging)-teams at CWP for fruitful discussions. The model was provided to us by Romain Brossiere (Universit´e Joseph Fourier, Grenoble) and Olav Barkved (Petoro, Norway). This work was supported by the Consortium Project on Seismic Inverse Methods for Complex Structures at CWP and competitive research funding from King Abdullah University of Science and Technology (KAUST). The reproducible numerical examples are generated with the Madagascar open-source software package freely available from http://www.ahay.org.
PublisherSociety of Exploration Geophysicists