Attenuation compensation for least-squares reverse time migration using the viscoacoustic-wave equation

Handle URI:
http://hdl.handle.net/10754/346971
Title:
Attenuation compensation for least-squares reverse time migration using the viscoacoustic-wave equation
Authors:
Dutta, Gaurav ( 0000-0002-2024-1683 ) ; Schuster, Gerard T. ( 0000-0001-7532-1587 )
Abstract:
Strong subsurface attenuation leads to distortion of amplitudes and phases of seismic waves propagating inside the earth. Conventional acoustic reverse time migration (RTM) and least-squares reverse time migration (LSRTM) do not account for this distortion, which can lead to defocusing of migration images in highly attenuative geologic environments. To correct for this distortion, we used a linearized inversion method, denoted as Qp-LSRTM. During the leastsquares iterations, we used a linearized viscoacoustic modeling operator for forward modeling. The adjoint equations were derived using the adjoint-state method for back propagating the residual wavefields. The merit of this approach compared with conventional RTM and LSRTM was that Qp-LSRTM compensated for the amplitude loss due to attenuation and could produce images with better balanced amplitudes and more resolution below highly attenuative layers. Numerical tests on synthetic and field data illustrated the advantages of Qp-LSRTM over RTM and LSRTM when the recorded data had strong attenuation effects. Similar to standard LSRTM, the sensitivity tests for background velocity and Qp errors revealed that the liability of this method is the requirement for smooth and accurate migration velocity and attenuation models.
KAUST Department:
Earth Science and Engineering Program
Citation:
Attenuation compensation for least-squares reverse time migration using the viscoacoustic-wave equation 2014, 79 (6):S251 GEOPHYSICS
Publisher:
Society of Exploration Geophysicists
Journal:
GEOPHYSICS
Issue Date:
Oct-2014
DOI:
10.1190/geo2013-0414.1
Type:
Article
ISSN:
0016-8033; 1942-2156
Additional Links:
http://library.seg.org/doi/abs/10.1190/geo2013-0414.1
Appears in Collections:
Articles; Earth Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorDutta, Gauraven
dc.contributor.authorSchuster, Gerard T.en
dc.date.accessioned2015-03-23T08:13:08Zen
dc.date.available2015-03-23T08:13:08Zen
dc.date.issued2014-10en
dc.identifier.citationAttenuation compensation for least-squares reverse time migration using the viscoacoustic-wave equation 2014, 79 (6):S251 GEOPHYSICSen
dc.identifier.issn0016-8033en
dc.identifier.issn1942-2156en
dc.identifier.doi10.1190/geo2013-0414.1en
dc.identifier.urihttp://hdl.handle.net/10754/346971en
dc.description.abstractStrong subsurface attenuation leads to distortion of amplitudes and phases of seismic waves propagating inside the earth. Conventional acoustic reverse time migration (RTM) and least-squares reverse time migration (LSRTM) do not account for this distortion, which can lead to defocusing of migration images in highly attenuative geologic environments. To correct for this distortion, we used a linearized inversion method, denoted as Qp-LSRTM. During the leastsquares iterations, we used a linearized viscoacoustic modeling operator for forward modeling. The adjoint equations were derived using the adjoint-state method for back propagating the residual wavefields. The merit of this approach compared with conventional RTM and LSRTM was that Qp-LSRTM compensated for the amplitude loss due to attenuation and could produce images with better balanced amplitudes and more resolution below highly attenuative layers. Numerical tests on synthetic and field data illustrated the advantages of Qp-LSRTM over RTM and LSRTM when the recorded data had strong attenuation effects. Similar to standard LSRTM, the sensitivity tests for background velocity and Qp errors revealed that the liability of this method is the requirement for smooth and accurate migration velocity and attenuation models.en
dc.publisherSociety of Exploration Geophysicistsen
dc.relation.urlhttp://library.seg.org/doi/abs/10.1190/geo2013-0414.1en
dc.rights© 2014 Society of Exploration Geophysicists. All rights reserveden
dc.titleAttenuation compensation for least-squares reverse time migration using the viscoacoustic-wave equationen
dc.typeArticleen
dc.contributor.departmentEarth Science and Engineering Programen
dc.identifier.journalGEOPHYSICSen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorSchuster, Gerard T.en
kaust.authorDutta, Gauraven
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