An efficient wave extrapolation method for anisotropic media with tilt

Handle URI:
http://hdl.handle.net/10754/578798
Title:
An efficient wave extrapolation method for anisotropic media with tilt
Authors:
Waheed, Umair bin ( 0000-0002-5189-0694 ) ; Alkhalifah, Tariq Ali ( 0000-0002-9363-9799 )
Abstract:
Wavefield extrapolation operators for elliptically anisotropic media offer significant cost reduction compared with that for the transversely isotropic case, particularly when the axis of symmetry exhibits tilt (from the vertical). However, elliptical anisotropy does not provide accurate wavefield representation or imaging for transversely isotropic media. Therefore, we propose effective elliptically anisotropic models that correctly capture the kinematic behaviour of wavefields for transversely isotropic media. Specifically, we compute source-dependent effective velocities for the elliptic medium using kinematic high-frequency representation of the transversely isotropic wavefield. The effective model allows us to use cheaper elliptic wave extrapolation operators. Despite the fact that the effective models are obtained by matching kinematics using high-frequency asymptotic, the resulting wavefield contains most of the critical wavefield components, including frequency dependency and caustics, if present, with reasonable accuracy. The methodology developed here offers a much better cost versus accuracy trade-off for wavefield computations in transversely isotropic media, particularly for media of low to moderate complexity. In addition, the wavefield solution is free from shear-wave artefacts as opposed to the conventional finite-difference-based transversely isotropic wave extrapolation scheme. We demonstrate these assertions through numerical tests on synthetic tilted transversely isotropic models.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
An efficient wave extrapolation method for anisotropic media with tilt 2015, 63 (5):1126 Geophysical Prospecting
Publisher:
Wiley-Blackwell
Journal:
Geophysical Prospecting
Issue Date:
23-Mar-2015
DOI:
10.1111/1365-2478.12233
Type:
Article
ISSN:
00168025
Additional Links:
http://doi.wiley.com/10.1111/1365-2478.12233
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorWaheed, Umair binen
dc.contributor.authorAlkhalifah, Tariq Alien
dc.date.accessioned2015-09-28T06:41:31Zen
dc.date.available2015-09-28T06:41:31Zen
dc.date.issued2015-03-23en
dc.identifier.citationAn efficient wave extrapolation method for anisotropic media with tilt 2015, 63 (5):1126 Geophysical Prospectingen
dc.identifier.issn00168025en
dc.identifier.doi10.1111/1365-2478.12233en
dc.identifier.urihttp://hdl.handle.net/10754/578798en
dc.description.abstractWavefield extrapolation operators for elliptically anisotropic media offer significant cost reduction compared with that for the transversely isotropic case, particularly when the axis of symmetry exhibits tilt (from the vertical). However, elliptical anisotropy does not provide accurate wavefield representation or imaging for transversely isotropic media. Therefore, we propose effective elliptically anisotropic models that correctly capture the kinematic behaviour of wavefields for transversely isotropic media. Specifically, we compute source-dependent effective velocities for the elliptic medium using kinematic high-frequency representation of the transversely isotropic wavefield. The effective model allows us to use cheaper elliptic wave extrapolation operators. Despite the fact that the effective models are obtained by matching kinematics using high-frequency asymptotic, the resulting wavefield contains most of the critical wavefield components, including frequency dependency and caustics, if present, with reasonable accuracy. The methodology developed here offers a much better cost versus accuracy trade-off for wavefield computations in transversely isotropic media, particularly for media of low to moderate complexity. In addition, the wavefield solution is free from shear-wave artefacts as opposed to the conventional finite-difference-based transversely isotropic wave extrapolation scheme. We demonstrate these assertions through numerical tests on synthetic tilted transversely isotropic models.en
dc.language.isoenen
dc.publisherWiley-Blackwellen
dc.relation.urlhttp://doi.wiley.com/10.1111/1365-2478.12233en
dc.rightsArchived with thanks to Geophysical Prospectingen
dc.subjectAnisotropyen
dc.subjectModellingen
dc.subjectWaveen
dc.titleAn efficient wave extrapolation method for anisotropic media with tilten
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalGeophysical Prospectingen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorWaheed, Umair binen
kaust.authorAlkhalifah, Tariq Alien
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