Salt-body Inversion with Minimum Gradient Support and Sobolev Space Norm Regularizations

Handle URI:
http://hdl.handle.net/10754/624912
Title:
Salt-body Inversion with Minimum Gradient Support and Sobolev Space Norm Regularizations
Authors:
Kazei, V.V.; Kalita, M.; Alkhalifah, Tariq Ali ( 0000-0002-9363-9799 )
Abstract:
Full-waveform inversion (FWI) is a technique which solves the ill-posed seismic inversion problem of fitting our model data to the measured ones from the field. FWI is capable of providing high-resolution estimates of the model, and of handling wave propagation of arbitrary complexity (visco-elastic, anisotropic); yet, it often fails to retrieve high-contrast geological structures, such as salt. One of the reasons for the FWI failure is that the updates at earlier iterations are too smooth to capture the sharp edges of the salt boundary. We compare several regularization approaches, which promote sharpness of the edges. Minimum gradient support (MGS) regularization focuses the inversion on blocky models, even more than the total variation (TV) does. However, both approaches try to invert undesirable high wavenumbers in the model too early for a model of complex structure. Therefore, we apply the Sobolev space norm as a regularizing term in order to maintain a balance between sharp and smooth updates in FWI. We demonstrate the application of these regularizations on a Marmousi model, enriched by a chunk of salt. The model turns out to be too complex in some parts to retrieve its full velocity distribution, yet the salt shape and contrast are retrieved.
KAUST Department:
King Abdullah University of Science & Technology
Citation:
Kazei VV, Kalita M, Alkhalifah T (2017) Salt-body Inversion with Minimum Gradient Support and Sobolev Space Norm Regularizations. 79th EAGE Conference and Exhibition 2017. Available: http://dx.doi.org/10.3997/2214-4609.201700600.
Publisher:
EAGE Publications BV
Journal:
79th EAGE Conference and Exhibition 2017
Issue Date:
26-May-2017
DOI:
10.3997/2214-4609.201700600
Type:
Conference Paper
Sponsors:
We thank KAUST for support and Seismic Wave Analysis Group for fruitful discussions.
Additional Links:
http://www.earthdoc.org/publication/publicationdetails/?publication=88317
Appears in Collections:
Conference Papers

Full metadata record

DC FieldValue Language
dc.contributor.authorKazei, V.V.en
dc.contributor.authorKalita, M.en
dc.contributor.authorAlkhalifah, Tariq Alien
dc.date.accessioned2017-06-12T08:33:42Z-
dc.date.available2017-06-12T08:33:42Z-
dc.date.issued2017-05-26en
dc.identifier.citationKazei VV, Kalita M, Alkhalifah T (2017) Salt-body Inversion with Minimum Gradient Support and Sobolev Space Norm Regularizations. 79th EAGE Conference and Exhibition 2017. Available: http://dx.doi.org/10.3997/2214-4609.201700600.en
dc.identifier.doi10.3997/2214-4609.201700600en
dc.identifier.urihttp://hdl.handle.net/10754/624912-
dc.description.abstractFull-waveform inversion (FWI) is a technique which solves the ill-posed seismic inversion problem of fitting our model data to the measured ones from the field. FWI is capable of providing high-resolution estimates of the model, and of handling wave propagation of arbitrary complexity (visco-elastic, anisotropic); yet, it often fails to retrieve high-contrast geological structures, such as salt. One of the reasons for the FWI failure is that the updates at earlier iterations are too smooth to capture the sharp edges of the salt boundary. We compare several regularization approaches, which promote sharpness of the edges. Minimum gradient support (MGS) regularization focuses the inversion on blocky models, even more than the total variation (TV) does. However, both approaches try to invert undesirable high wavenumbers in the model too early for a model of complex structure. Therefore, we apply the Sobolev space norm as a regularizing term in order to maintain a balance between sharp and smooth updates in FWI. We demonstrate the application of these regularizations on a Marmousi model, enriched by a chunk of salt. The model turns out to be too complex in some parts to retrieve its full velocity distribution, yet the salt shape and contrast are retrieved.en
dc.description.sponsorshipWe thank KAUST for support and Seismic Wave Analysis Group for fruitful discussions.en
dc.publisherEAGE Publications BVen
dc.relation.urlhttp://www.earthdoc.org/publication/publicationdetails/?publication=88317en
dc.rightsGold Open Accessen
dc.rightsArchived with thanks to 79th EAGE Conference and Exhibition 2017en
dc.titleSalt-body Inversion with Minimum Gradient Support and Sobolev Space Norm Regularizationsen
dc.typeConference Paperen
dc.contributor.departmentKing Abdullah University of Science & Technologyen
dc.identifier.journal79th EAGE Conference and Exhibition 2017en
dc.eprint.versionPublisher's Version/PDFen
kaust.authorKazei, V.V.en
kaust.authorKalita, M.en
kaust.authorAlkhalifah, Tariq Alien
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