Inversion gradients for acoustic VTI wavefield tomography
© 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 w...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Published: |
Society of Exploration Geophysics
2017
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| Online Access: | http://hdl.handle.net/20.500.11937/71525 |
| _version_ | 1848762503373258752 |
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| author | Li, V. Wang, Hui Tsvankin, Ilya Díaz, E. Alkhalifah, T. |
| author_facet | Li, V. Wang, Hui Tsvankin, Ilya Díaz, E. Alkhalifah, T. |
| author_sort | Li, V. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 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 ?. |
| first_indexed | 2025-11-14T10:48:36Z |
| format | Journal Article |
| id | curtin-20.500.11937-71525 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:48:36Z |
| publishDate | 2017 |
| publisher | Society of Exploration Geophysics |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-715252018-12-13T09:32:39Z Inversion gradients for acoustic VTI wavefield tomography Li, V. Wang, Hui Tsvankin, Ilya Díaz, E. Alkhalifah, T. © 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 ?. 2017 Journal Article http://hdl.handle.net/20.500.11937/71525 10.1190/GEO2016-0624.1 Society of Exploration Geophysics restricted |
| spellingShingle | Li, V. Wang, Hui Tsvankin, Ilya Díaz, E. Alkhalifah, T. Inversion gradients for acoustic VTI wavefield tomography |
| title | Inversion gradients for acoustic VTI wavefield tomography |
| title_full | Inversion gradients for acoustic VTI wavefield tomography |
| title_fullStr | Inversion gradients for acoustic VTI wavefield tomography |
| title_full_unstemmed | Inversion gradients for acoustic VTI wavefield tomography |
| title_short | Inversion gradients for acoustic VTI wavefield tomography |
| title_sort | inversion gradients for acoustic vti wavefield tomography |
| url | http://hdl.handle.net/20.500.11937/71525 |