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dc.contributor.authorLi, V.
dc.contributor.authorWang, Hui
dc.contributor.authorTsvankin, Ilya
dc.contributor.authorDíaz, E.
dc.contributor.authorAlkhalifah, T.
dc.identifier.citationLi, V. and Wang, H. and Tsvankin, I. and Díaz, E. and Alkhalifah, T. 2017. Inversion gradients for acoustic VTI wavefield tomography. Geophysics. 82 (4): pp. WA55-WA65.

© 2017 Society of Exploration Geophysicists. All rights reserved. Wavefield tomography can handle complex subsurface geology better than ray-based techniques and, ultimately, provide a higher resolution. Here, we implement forward and adjoint wavefield extrapolation for VTI (transversely isotropic with a vertical symmetry axis) media using a generalized pseudospectral operator based on a separable approximation for the P-wave dispersion relation. This operator is employed to derive the gradients of the differential semblance optimization (DSO) and modified image-power objective functions. We also obtain the gradient expressions for a data-domain objective function that can more easily incorporate borehole information necessary for stable VTI velocity analysis. These gradients are similar to the ones obtained with a space-time finite-difference (FD) scheme for a system of coupled wave equations but the pseudospectral method is not hampered by the imprint of the shear-wave artifact. Numerical examples also show the potential advantages of the modified image-power objective function in estimating the anellipticity parameter ?.

dc.publisherSociety of Exploration Geophysics
dc.titleInversion gradients for acoustic VTI wavefield tomography
dc.typeJournal Article
curtin.accessStatusFulltext not available

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