Gradient computation for VTI acoustic wavefield tomography

Handle URI:
http://hdl.handle.net/10754/625252
Title:
Gradient computation for VTI acoustic wavefield tomography
Authors:
Li, Vladimir; Wang, Hui; Tsvankin, Ilya; Diaz, Esteban; Alkhalifah, Tariq Ali ( 0000-0002-9363-9799 )
Abstract:
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 pseudospectral operator that employes a separable approximation of the P-wave dispersion relation. This operator is employed to derive the gradients of the differential semblance optimization (DSO) and modified stack-power objective functions. We also obtain the gradient expressions for the data-domain objective function, which can incorporate borehole information necessary for stable VTI velocity analysis. These gradients are compared to the ones obtained with a space-time finite-difference (FD) scheme for a system of coupled wave equations. Whereas the kernels computed with the two wave-equation operators are similar, the pseudospectral method is not hampered by the imprint of the shear-wave artifact. Numerical examples also show that the modified stack-power objective function produces cleaner gradients than the more conventional DSO operator.
KAUST Department:
King Abdullah University of Science and Technology, , Saudi Arabia
Citation:
Li V, Wang H, Tsvankin I, Diaz E, Alkhalifah T (2016) Gradient computation for VTI acoustic wavefield tomography. SEG Technical Program Expanded Abstracts 2016. Available: http://dx.doi.org/10.1190/segam2016-13967436.1.
Publisher:
Society of Exploration Geophysicists
Journal:
SEG Technical Program Expanded Abstracts 2016
Conference/Event name:
SEG International Exposition and 86th Annual Meeting, SEG 2016
Issue Date:
6-Sep-2016
DOI:
10.1190/segam2016-13967436.1
Type:
Conference Paper
Sponsors:
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).
Additional Links:
http://library.seg.org/doi/10.1190/segam2016-13967436.1
Appears in Collections:
Conference Papers

Full metadata record

DC FieldValue Language
dc.contributor.authorLi, Vladimiren
dc.contributor.authorWang, Huien
dc.contributor.authorTsvankin, Ilyaen
dc.contributor.authorDiaz, Estebanen
dc.contributor.authorAlkhalifah, Tariq Alien
dc.date.accessioned2017-07-26T06:19:09Z-
dc.date.available2017-07-26T06:19:09Z-
dc.date.issued2016-09-06en
dc.identifier.citationLi V, Wang H, Tsvankin I, Diaz E, Alkhalifah T (2016) Gradient computation for VTI acoustic wavefield tomography. SEG Technical Program Expanded Abstracts 2016. Available: http://dx.doi.org/10.1190/segam2016-13967436.1.en
dc.identifier.doi10.1190/segam2016-13967436.1en
dc.identifier.urihttp://hdl.handle.net/10754/625252-
dc.description.abstractWavefield 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 pseudospectral operator that employes a separable approximation of the P-wave dispersion relation. This operator is employed to derive the gradients of the differential semblance optimization (DSO) and modified stack-power objective functions. We also obtain the gradient expressions for the data-domain objective function, which can incorporate borehole information necessary for stable VTI velocity analysis. These gradients are compared to the ones obtained with a space-time finite-difference (FD) scheme for a system of coupled wave equations. Whereas the kernels computed with the two wave-equation operators are similar, the pseudospectral method is not hampered by the imprint of the shear-wave artifact. Numerical examples also show that the modified stack-power objective function produces cleaner gradients than the more conventional DSO operator.en
dc.description.sponsorshipThis 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).en
dc.publisherSociety of Exploration Geophysicistsen
dc.relation.urlhttp://library.seg.org/doi/10.1190/segam2016-13967436.1en
dc.rightsArchived with thanks to SEG Technical Program Expanded Abstracts 2016en
dc.titleGradient computation for VTI acoustic wavefield tomographyen
dc.typeConference Paperen
dc.contributor.departmentKing Abdullah University of Science and Technology, , Saudi Arabiaen
dc.identifier.journalSEG Technical Program Expanded Abstracts 2016en
dc.conference.date2011-10-16 to 2011-10-21en
dc.conference.nameSEG International Exposition and 86th Annual Meeting, SEG 2016en
dc.conference.locationDallas, TX, USAen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionCenter for Wave Phenomena, Colorado School of Mines, , United Statesen
kaust.authorAlkhalifah, Tariq Alien
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