Image registration guided wavefield tomography for shear wave velocity model building

Malcolm, Alison and Yang, Di and Fehler, Mike and Shang, Xuefeng (2014) Image registration guided wavefield tomography for shear wave velocity model building. SEG Technical Program Expanded Abstracts 2014, 2014. pp. 1200-1205. ISSN 1949-4645

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Abstract

Multi-component acquisitions offer the opportunity to form elastic migration images and to estimate elastic parameters of the subsurface. In this study, we propose an image registration guided S-wave velocity inversion method based on the knowledge of the P-wave velocities. The PS depth migration image is registered to the PP image with a shift function obtained by dynamic image warping. In each step, a target image is generated by warping the PS image by a fraction of the shift function to avoid cycle-skipping. Elastic image domain wave-field tomography is used to minimize the image differences between the PS image and the target image to update the S-wave velocities iteratively. The method works with high-frequency reflection data. Starting from an arbitrary constant S-wave velocity model, the inversion delivers a high quality PS image and a smooth velocity model.

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