KAUST DepartmentEarth Science and Engineering Program
Physical Science and Engineering (PSE) Division
Seismic Wave Analysis Group
Permanent link to this recordhttp://hdl.handle.net/10754/663928
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AbstractExtended images obtained from reverse-time migration (RTM) contain information about the accuracy of the velocity field and subsurface illumination at different incidence angles. Here, we evaluate the influence of errors in the anisotropy parameters on the residual moveout (RMO) in P-wave extended images obtained with RTM for VTI (transversely isotropic with a vertical symmetry axis) media. Assuming the actual spatial distribution of the zero-dip normal-moveout velocity, we analyze extended images computed with distorted fields of the parameters ? and d. Differential semblance optimization (DSO) and stackpower criteria are employed to study the sensitivity of focusing to the anisotropy parameters. The results show that the signature of ? is dip-dependent, whereas errors in d cause defocusing in extended images only if that parameter varies laterally. We also obtain and analyze the gradients of the DSO objective function with respect to the anisotropy parameters. The results of this work provide the foundation for anisotropic wavefield tomography operating with extended images.
CitationLi, V., Tsvankin, I., & Alkhalifah, T. (2016). Anisotropy Signature in P-wave Extended Images for VTI Media. 78th EAGE Conference and Exhibition 2016. doi:10.3997/2214-4609.201600834
SponsorsThis work was supported by the sponsors of the Center for Wave Phenomena (CWP) and competitive research funding from the King Abdullah University of Science and Technology (KAUST), Saudi Arabia.
Conference/Event name78th EAGE Conference and Exhibition 2016: Efficient Use of Technology - Unlocking Potential