Angle gathers in wave-equation imaging for transversely isotropic media

Handle URI:
http://hdl.handle.net/10754/561633
Title:
Angle gathers in wave-equation imaging for transversely isotropic media
Authors:
Alkhalifah, Tariq Ali ( 0000-0002-9363-9799 ) ; Fomel, Sergey B.
Abstract:
In recent years, wave-equation imaged data are often presented in common-image angle-domain gathers as a decomposition in the scattering angle at the reflector, which provide a natural access to analysing migration velocities and amplitudes. In the case of anisotropic media, the importance of angle gathers is enhanced by the need to properly estimate multiple anisotropic parameters for a proper representation of the medium. We extract angle gathers for each downward-continuation step from converting offset-frequency planes into angle-frequency planes simultaneously with applying the imaging condition in a transversely isotropic with a vertical symmetry axis (VTI) medium. The analytic equations, though cumbersome, are exact within the framework of the acoustic approximation. They are also easily programmable and show that angle gather mapping in the case of anisotropic media differs from its isotropic counterpart, with the difference depending mainly on the strength of anisotropy. Synthetic examples demonstrate the importance of including anisotropy in the angle gather generation as mapping of the energy is negatively altered otherwise. In the case of a titled axis of symmetry (TTI), the same VTI formulation is applicable but requires a rotation of the wavenumbers. © 2010 European Association of Geoscientists & Engineers.
KAUST Department:
Earth Science and Engineering Program; Physical Sciences and Engineering (PSE) Division; Environmental Science and Engineering Program
Publisher:
Wiley
Journal:
Geophysical Prospecting
Issue Date:
12-Nov-2010
DOI:
10.1111/j.1365-2478.2010.00930.x
Type:
Article
ISSN:
00168025
Appears in Collections:
Articles; Environmental Science and Engineering Program; Physical Sciences and Engineering (PSE) Division; Earth Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorAlkhalifah, Tariq Alien
dc.contributor.authorFomel, Sergey B.en
dc.date.accessioned2015-08-03T09:00:55Zen
dc.date.available2015-08-03T09:00:55Zen
dc.date.issued2010-11-12en
dc.identifier.issn00168025en
dc.identifier.doi10.1111/j.1365-2478.2010.00930.xen
dc.identifier.urihttp://hdl.handle.net/10754/561633en
dc.description.abstractIn recent years, wave-equation imaged data are often presented in common-image angle-domain gathers as a decomposition in the scattering angle at the reflector, which provide a natural access to analysing migration velocities and amplitudes. In the case of anisotropic media, the importance of angle gathers is enhanced by the need to properly estimate multiple anisotropic parameters for a proper representation of the medium. We extract angle gathers for each downward-continuation step from converting offset-frequency planes into angle-frequency planes simultaneously with applying the imaging condition in a transversely isotropic with a vertical symmetry axis (VTI) medium. The analytic equations, though cumbersome, are exact within the framework of the acoustic approximation. They are also easily programmable and show that angle gather mapping in the case of anisotropic media differs from its isotropic counterpart, with the difference depending mainly on the strength of anisotropy. Synthetic examples demonstrate the importance of including anisotropy in the angle gather generation as mapping of the energy is negatively altered otherwise. In the case of a titled axis of symmetry (TTI), the same VTI formulation is applicable but requires a rotation of the wavenumbers. © 2010 European Association of Geoscientists & Engineers.en
dc.publisherWileyen
dc.subjectAngle gathersen
dc.subjectAnisotropyen
dc.titleAngle gathers in wave-equation imaging for transversely isotropic mediaen
dc.typeArticleen
dc.contributor.departmentEarth Science and Engineering Programen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentEnvironmental Science and Engineering Programen
dc.identifier.journalGeophysical Prospectingen
dc.contributor.institutionThe University of Texas at Austin, Bureau of Economic Geology, University Station, Box X, Austin, TX 78713-8924, United Statesen
kaust.authorAlkhalifah, Tariq Alien
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