Explicit prestack depth migration in laterally varying VTI media

Ren Jiaxiang; Gerrard Clive; Long Andrew; McClean James; Orlovich Mikhail

doi:10.1071/ASEG2006ab149

ISSN: 2202-0586
E-ISSN:

oa Explicit prestack depth migration in laterally varying VTI media
Authors Ren Jiaxiang^a, Gerrard Clive^b, Long Andrew^c, McClean James^d and Orlovich Mikhail^e
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^a PGS Marine Geophysical, 15150 Memorial Drive Houston, , TX, 77079, , USA, [email protected] ^b PGS Marine Geophysical, 15150 Memorial Drive Houston, , TX, 77079, , USA, [email protected] ^c PGS Marine Geophysical, 1060 Hay street West Perth, , WA, 6005, , Australia, [email protected] ^d PGS Marine Geophysical, 15150 Memorial Drive Houston, , TX, 77079, , USA, [email protected] ^e PGS Marine Geophysical, 15150 Memorial Drive Houston, , TX, 77079, , USA, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2006, Issue ASEG2006 - 18th Geophysical Conference, Dec 2006, p. 1 - 5
DOI: https://doi.org/10.1071/ASEG2006ab149
- Published online: 01 Dec 2006

Abstract

We present an efficient and stable method for wave equation prestack depth migration (PSDM) in laterally varying VTI media. The method accurately handles large lateral variations in the Thomsen anisotropy parameters, ε and δ, as well as vertical velocity. It performs wavefield extrapolation using a constrained explicit operator that we originally proposed and successfully applied for isotropie wave equation PSDM. The constrained operator has a reduced number of independent coefficients, leading to improved migration efficiency whilst retaining accuracy. The optimization process for the operator design ensures that we can quickly design a large number of well-behaved operators for different combinations of velocity and anisotropy parameters. Model and field data examples show that the migration method proposed is able to produce well focused and correctly positioned images in areas of complex geology.

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2006-12-01

2026-01-16

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References

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Helgesen, H., Arntsen, B. and Rosten, T., 2003, Wave-equation-based prestack depth migration of converted wave data in TIV media: 73rd Meeting, SEG, Dallas, Expanded Abstracts, 953-956.
Le Rousseau, J. H., 1997, Depth migration in heterogeneous, transversely isotropie media with the phase-shift-plus-interpolation method, 67th Meeting, SEG, Dallas, Expanded Abstracts, 1703-1706.
Mittet, R., 2002, Explicit 3D depth migration with a constrained operator: 72nd Meeting, SEG, Salt Lake City, Expanded Abstracts, 1148-1151.
Ren, J., Gerrard, C, McClean, J. and Orlovich, M., 2004, An efficient 3D explicit depth migration: 17th Meeting, ASEG, Sidney, Expanded Abstract, 1-55.
Ristow, D. and Ruhl, T., 1997, Migration in transversely isotropie media using implicit operators: 67th Meeting, SEG, Dallas, Expanded Abstracts, 1699-1702.
Tsvankin, I., 2001, Seismic signatures and analysis of reflection data in anisotropie media: Pergamon.
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Article Type: Research Article

Keyword(s): anisotropy; depth migration; explicit extrapolator; prestack; wave equation

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oa Explicit prestack depth migration in laterally varying VTI media

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