Tomographic determination of interval velocities from picked reflection seismic data

Sword, Charles H.

doi:10.1190/1.1892933

Cited by 76 publications

(53 citation statements)

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“…Redistribution subject to SEG license or copyright; see Terms of Use at http://library.seg.org/ Etgen (1990), and van Trier (1990) employ automatic, inverse methods for migration velocity analysis. The automatic approach of Sword (1987) can be considered to be a ray-based method analogous to migration velocity analysis that uses the migrated traveltimes for the objective function. It is probably because this group of literature focuses on the practical aspects of velocity analysis, such as stability and human quality control, that it prefers the postmigrated domain for optimization.…”

Section: Introductionmentioning

confidence: 99%

Reflection tomography in the postmigrated domain

Stork¹

1992

GEOPHYSICS

346

147

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Reflection tomography is an inversion method that adjusts a velocity and reflector depth model to be consistent with the prestack time data. This tomography approach minimizes the misfit of the data and model in the premigrated domain. Generally, the data are represented by the traveltimes of reflection events, which has made the technique problematic and unpopular.Techniques generally known as "migration velocity analysis" have a similar objective but use the postmigrated domain. For a variety of practical reasons, this postmigrated domain has advantages over the premigrated domain. With slight modifications, the reflec-

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Section: Introductionmentioning

confidence: 99%

Reflection tomography in the postmigrated domain

Stork¹

1992

GEOPHYSICS

346

147

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“…Inversion of the information extracted by a local stacking operator, such as local slant stacks (Sword, 1987;Billette et al, 1997) or beam stacks (Biondi, 1992), is a potentially useful compromise in this trade-off. Recently, such inversion has been revived by development of the common-reflection-point-stacking (CRS) methodology (Perroud et al, 1999) and of the multifocusing imaging method (Gurevich and Landa, 2002).…”

Section: Traveltime Reflection Tomographymentioning

confidence: 99%

6. Principles of Velocity Analysis

2007

Concepts and Applications in 3D Seismic Imaging

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“…Stereotomography has been proposed and developed by Billette & Lambaré (1998). It belongs to the family of slope tomography methods (Riabinkin 1957; Sword 1987), where the velocity macromodel is estimated from locally coherent events characterized by their slopes in the pre‐stack data cube. Picking such events is much easier than picking globally coherent events as in standard traveltime reflection tomography (Bishop et al 1985; Farra & Madariaga 1988).…”

Section: Introductionmentioning

confidence: 99%

Two-dimensionalPP/PS-stereotomography:P- andS-waves velocities estimation from OBC data

Alerini

Lambaré

Baina³

et al. 2007

Geophysical Journal International

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S U M M A R YWe present the extension of stereotomography to P-and S-wave velocity estimation from PP-and PS-reflected/diffracted waves. In this new context, we greatly benefit from the use of locally coherent events by stereotomography. In particular, when applied to S-wave velocity estimation from PS-data, no pairing of PP-and PS-events is a priori required. In our procedure the P-wave velocity model is obtained first using stereotomography on PP-arrivals. Then the S-wave velocity model is obtained using PS-stereotomography on PS-arrivals fixing the Pwave velocity model. We present an application to an 'ideal' synthetic data set demonstrating the relevance of the approach, which allows us to recover depth consistent P-and S-waves velocity models even if no pairing of PP-and PS-events is introduced. Finally, results to a real data set from the Gulf of Mexico are presented demonstrating the potential of the method in a noisy data context.

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Tomographic determination of interval velocities from picked reflection seismic data

Cited by 76 publications

References 1 publication

Reflection tomography in the postmigrated domain

Reflection tomography in the postmigrated domain

6. Principles of Velocity Analysis

Two-dimensionalPP/PS-stereotomography:P- andS-waves velocities estimation from OBC data

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