Effective anisotropy through traveltime and amplitude matching

Handle URI:
http://hdl.handle.net/10754/593368
Title:
Effective anisotropy through traveltime and amplitude matching
Authors:
Wang, Hui; Waheed, Umair bin ( 0000-0002-5189-0694 ) ; Alkhalifah, Tariq Ali ( 0000-0002-9363-9799 )
Abstract:
Introducing anisotropy to seismic wave propagation reveals more realistic physics of our Earth's subsurface as compared to the isotropic assumption. However wavefield modeling, the engine of seismic inverse problems, in anisotropic media still suffers from computational burdens, in particular with complex anisotropy such as transversely isotropic (TI) and Orthorhombic anisotropy. We develop effective isotropic velocity and density models to package the effects of anisotropy such that the wave propagation behavior using these effective models approximate those of the original anisotropic model. We build these effective models through the high frequency asymptotic approximation based on the eikonal and transport equations. We match the geometrical behavior of the wave-fields, given by traveltimes, from the anisotropic and isotropic eikonal equations. This matching yields the effective isotropic velocity that approximates the kinematics of the anisotropic wavefield. Equivalently, we calculate the effective densities by equating the anisotropic and isotropic transport equations. The effective velocities and densities are then fed into the isotropic acoustic variable density wave equation to obtain cheaper anisotropic wavefields. We justify our approach by testing it on an elliptical anisotropic model. The numerical results demonstrate a good matching of both traveltime and amplitude between anisotropic and effective isotropic wavefields.
KAUST Department:
Earth Science and Engineering Program
Publisher:
Society of Exploration Geophysicists
Journal:
SEG Technical Program Expanded Abstracts 2014
Conference/Event name:
SEG Technical Program Expanded Abstracts 2014
Issue Date:
5-Aug-2014
DOI:
10.1190/segam2014-1183.1
Type:
Conference Paper
Additional Links:
http://library.seg.org/doi/abs/10.1190/segam2014-1183.1
Appears in Collections:
Conference Papers; Earth Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorWang, Huien
dc.contributor.authorWaheed, Umair binen
dc.contributor.authorAlkhalifah, Tariq Alien
dc.date.accessioned2016-01-13T09:47:10Zen
dc.date.available2016-01-13T09:47:10Zen
dc.date.issued2014-08-05en
dc.identifier.doi10.1190/segam2014-1183.1en
dc.identifier.urihttp://hdl.handle.net/10754/593368en
dc.description.abstractIntroducing anisotropy to seismic wave propagation reveals more realistic physics of our Earth's subsurface as compared to the isotropic assumption. However wavefield modeling, the engine of seismic inverse problems, in anisotropic media still suffers from computational burdens, in particular with complex anisotropy such as transversely isotropic (TI) and Orthorhombic anisotropy. We develop effective isotropic velocity and density models to package the effects of anisotropy such that the wave propagation behavior using these effective models approximate those of the original anisotropic model. We build these effective models through the high frequency asymptotic approximation based on the eikonal and transport equations. We match the geometrical behavior of the wave-fields, given by traveltimes, from the anisotropic and isotropic eikonal equations. This matching yields the effective isotropic velocity that approximates the kinematics of the anisotropic wavefield. Equivalently, we calculate the effective densities by equating the anisotropic and isotropic transport equations. The effective velocities and densities are then fed into the isotropic acoustic variable density wave equation to obtain cheaper anisotropic wavefields. We justify our approach by testing it on an elliptical anisotropic model. The numerical results demonstrate a good matching of both traveltime and amplitude between anisotropic and effective isotropic wavefields.en
dc.publisherSociety of Exploration Geophysicistsen
dc.relation.urlhttp://library.seg.org/doi/abs/10.1190/segam2014-1183.1en
dc.subjectamplitudeen
dc.subjectanisotropyen
dc.subjecttraveltimeen
dc.subjecteffectiveen
dc.subjectisotropicen
dc.titleEffective anisotropy through traveltime and amplitude matchingen
dc.typeConference Paperen
dc.contributor.departmentEarth Science and Engineering Programen
dc.identifier.journalSEG Technical Program Expanded Abstracts 2014en
dc.conference.nameSEG Technical Program Expanded Abstracts 2014en
dc.eprint.versionPublisher's Version/PDFen
kaust.authorWang, Huien
kaust.authorWaheed, Umair binen
kaust.authorAlkhalifah, Tariq Alien
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