Separation of diffracted waves in transversely isotropic media

Arora, Yogesh; Tsvankin, Ilya

doi:10.1007/s11200-015-0483-z

Cited by 3 publications

(2 citation statements)

References 10 publications

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“…We compute dip-angle CIGs for the diffraction ramp model in Figure 2a used by Arora and Tsvankin (2016). Two locations (vertical blue lines in Figure 2b) are chosen to analyze the signature of both specular reflections and nonspecular diffractions.…”

Section: Numerical Examplesmentioning

confidence: 99%

“…Existing methodologies for diffraction separation are mostly limited to isotropic media and require accurate velocity models (Khaidukov et al, 2004;Kozlov et al, 2004;Berkovitch et al, 2009;Moser and Howard, 2008;Sturzu et al, 2013). Arora and Tsvankin (2016) develop a specularitybased method for separating diffractions in anisotropic media and apply it to 2D VTI (TI with vertical symmetry axis) media. Images of diffracted energy can supplement reflection-based interpretation in applications such as fracture characterization (Al-Dajani and Fomel, 2010) and time-lapse seismic monitoring (Alonaizi et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Analysis of diffractions in dip-angle gathers for transversely isotropic media

Arora

Tsvankin

2017

SEG Technical Program Expanded Abstracts 2017

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Diffractions can supplement reflected waves in anisotropic velocity analysis because they increase the aperture and may illuminate parts of the model that do not produce strong reflections. However, enhancement of diffractions and their separation from the more intensive reflections remains a challenging task, especially if the velocity model is not sufficiently accurate. Here, we construct dip-angle common-image gathers (CIGs) for transversely isotropic (TI) media using Kirchhoff migration. Dip-angle gathers can be conveniently used to generate diffraction-based depth images if a sufficiently accurate velocity model is available. We also analyze the moveout distortions of diffraction and reflection events in dip-angle CIGs in the presence of errors in the TI parameters. The residual moveout of diffractions computed from dip-angle gathers can be employed in migration velocity analysis (MVA) to refine the anisotropic velocity model.

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Section: Numerical Examplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of diffractions in dip-angle gathers for transversely isotropic media

Arora

Tsvankin

2017

SEG Technical Program Expanded Abstracts 2017

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Diffraction Imaging and Modeling and Seismic Modeling Complete Session

2017

SEG Technical Program Expanded Abstracts 2017

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Analysis of tip and edge diffractions in dip-angle gathers for orthorhombic media

Arora

Tsvankin

2018

SEG Technical Program Expanded Abstracts 2018

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Seismic diffractions, which are produced by heterogeneities smaller than seismic wavelength, have proved useful in a number of 2D and 3D applications. Among the challenges hampering the use of diffractions in seismic data processing is the sensitivity of diffraction separation after prestack migration to velocity errors. Therefore, it is essential to properly account for velocity anisotropy in diffraction separation and imaging.Here, we analyze the signature of diffractions in orthorhombic models, which are typical for many subsurface formations. Tip and edge diffraction events are modeled for a tetrahedron embedded in an orthorhombic medium. We construct 3D dip-angle common-image gathers (CIGs) as a function of azimuth and migration dip using the actual orthorhombic velocity field as well as a purely isotropic velocity model. The modeling results provide insight into the influence of velocity errors on the diffraction moveout in different azimuths in the dip-angle domain. This work should aid in constructing diffraction-based depth images using 3D anisotropic velocity models.

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Separation of diffracted waves in transversely isotropic media

Cited by 3 publications

References 10 publications

Analysis of diffractions in dip-angle gathers for transversely isotropic media

Analysis of diffractions in dip-angle gathers for transversely isotropic media

Diffraction Imaging and Modeling and Seismic Modeling Complete Session

Analysis of tip and edge diffractions in dip-angle gathers for orthorhombic media

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