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dc.contributor.authorLi, Vladimir
dc.contributor.authorTsvankin, Ilya
dc.contributor.authorGuitton, Antoine
dc.contributor.authorAlkhalifah, Tariq Ali
dc.date.accessioned2017-08-23T11:54:05Z
dc.date.available2017-08-23T11:54:05Z
dc.date.issued2017-08-17
dc.identifier.citationLi V, Tsvankin I, Guitton A, Alkhalifah T (2017) Acoustic VTI wavefield tomography of P-wave surface and VSP data. SEG Technical Program Expanded Abstracts 2017. Available: http://dx.doi.org/10.1190/segam2017-17742694.1.
dc.identifier.doi10.1190/segam2017-17742694.1
dc.identifier.urihttp://hdl.handle.net/10754/625377
dc.description.abstractTransversely isotropic (TI) models have become standard in depth imaging and are often used in waveform inversion. Here, we develop a robust wave-equation-based tomographic algorithm for building acoustic VTI (transversely isotropic with a vertical symmetry axis) velocity models from P-wave surface reflection and vertical seismic profiling (VSP) data. Wavefield extrapolation is performed with an integral operator to avoid generating shear-wave artifacts. Focusing energy in extended images produced by reverse-time migration (RTM) makes it possible to update the zero-dip NMO velocity Vnmo and the anellipiticity parameter η. To constrain the anisotropy coefficient δ and improve the accuracy in Vnmo and η, we employ borehole information by introducing an additional objective-function term designed to fit VSP data. Image-guided smoothing is applied to both data- and image-domain gradients to steer the inversion towards geologically plausible solutions. Testing on the VTI Marmousi model shows that the joint inversion of surface and VSP data helps estimate all three relevant medium parameters.
dc.description.sponsorshipWe thank the A(nisotropy) team at CWP for fruitful discussions. This work was supported by the Consortium Project on Seismic Inverse Methods for Complex Structures at CWP and competitive research funding from the King Abdullah University of Science and Technology (KAUST).
dc.publisherSociety of Exploration Geophysicists
dc.relation.urlhttp://library.seg.org/doi/10.1190/segam2017-17742694.1
dc.rightsArchived with thanks to SEG Technical Program Expanded Abstracts 2017
dc.subjectacoustic
dc.subjectanisotropy
dc.subjectborehole geophysics
dc.subjectVTI
dc.subjectwave equation
dc.titleAcoustic VTI wavefield tomography of P-wave surface and VSP data
dc.typeConference Paper
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.contributor.departmentEarth Science and Engineering Program
dc.identifier.journalSEG Technical Program Expanded Abstracts 2017
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionColorado School of Mines
kaust.personAlkhalifah, Tariq Ali
refterms.dateFOA2018-06-13T18:45:53Z


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