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dc.contributor.authorLi, Vladimir
dc.contributor.authorWang, Hui
dc.contributor.authorTsvankin, Ilya
dc.contributor.authorDiaz, Esteban
dc.contributor.authorAlkhalifah, Tariq Ali
dc.date.accessioned2017-07-26T06:19:09Z
dc.date.available2017-07-26T06:19:09Z
dc.date.issued2016-09
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.
dc.identifier.doi10.1190/segam2016-13967436.1
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.
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).
dc.publisherSociety of Exploration Geophysicists
dc.relation.urlhttp://library.seg.org/doi/10.1190/segam2016-13967436.1
dc.rightsArchived with thanks to SEG Technical Program Expanded Abstracts 2016
dc.titleGradient computation for VTI acoustic wavefield tomography
dc.typeConference Paper
dc.contributor.departmentEarth Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmentSeismic Wave Analysis Group
dc.identifier.journalSEG Technical Program Expanded Abstracts 2016
dc.conference.date2011-10-16 to 2011-10-21
dc.conference.nameSEG International Exposition and 86th Annual Meeting, SEG 2016
dc.conference.locationDallas, TX, USA
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionCenter for Wave Phenomena, Colorado School of Mines, , United States
kaust.personAlkhalifah, Tariq Ali
refterms.dateFOA2018-06-13T10:24:50Z
dc.date.published-online2016-09
dc.date.published-print2016-09


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