Kirchhoff PreSDM interactive dip‐gather stacking and dip illumination panel generation

Qin, Fuhao; Wang, Bin; Zhang, Po; Audebert, F.

doi:10.1190/1.2148071

Cited by 25 publications

(10 citation statements)

References 3 publications

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“…The final stacked images were not migrated due to the uneven fold distribution. An attempt to apply migration to the sparse 3D data resulted in severe artifacts which appeared as broad circular arcs, confirming expected negative effects of the irregular acquisition geometry (e.g., Canning and Gardner, 1998;Qin et al, 2005;Tang, 2007). An overview of the processing steps is given in Table 2.…”

Section: Data Processingmentioning

confidence: 83%

Time-lapse analysis of sparse 3D seismic data from the CO2 storage pilot site at Ketzin, Germany

Ivandic

Yang

Lüth

et al. 2012

Journal of Applied Geophysics

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Section: Data Processingmentioning

confidence: 83%

Time-lapse analysis of sparse 3D seismic data from the CO2 storage pilot site at Ketzin, Germany

Ivandic

Yang

Lüth

et al. 2012

Journal of Applied Geophysics

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“…In this study, we propose a different approach for this matter, based on a dip-angle criterion. Dip-angle information can be extracted from the prestack data to enhance the image quality and improve its reliability (Tabti et al, 2004;Qin et al, 2005;Bienati et al, 2009;Koren and Ravve, 2011;Dafni and Reshef, 2014). In relation to Kirchhoff migration, the stationary phase assumption implies that the Kirchhoff integral over the dip angles is constructive only along a limited dip aperture around the specular angle.…”

Section: Dip-angle Domain Specularity Filter Designmentioning

confidence: 99%

Kinematic artifacts in the subsurface-offset extended image and their elimination by a dip-domain specularity filter

Dafni

Symes

2016

GEOPHYSICS

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Common-image gathers in the dip-angle domain may be computed in relation to wave-equation migration methods, extended by the subsurface offset. They involve the application of a postmigration local Radon transform on the subsurface-offset extended image. In the dip-angle domain, seismic reflections are focused around the specular dip angle of reflection. This focusing distinguishes them from any other event in the image space. We have incorporated the dip-angle information about the presence of specular reflections into the computation of the conventional scattering-angle-dependent reflection coefficient. We have designed a specularity filter in the dip-angle domain based on a local semblance formula that recognizes and passes events associated with specular reflections, while suppressing other sorts of nonspecular signal. The filter is remarkably effective at eliminating either random or coherent noises that contaminates the prestack image. In particular, our dipangle filter provides a method for the suppression of kinematic artifacts, commonly generated by migration in the subsurfaceoffset domain. These artifacts are due to an abrupt truncation of the data acquisition geometry on the recording surface. We have studied their appearance and devised an appropriate formation mechanism in the subsurface-offset and scattering-angle domains. The prominent presence of the kinematic artifacts in image gathers usually impairs the quality of the postmigration analysis and decelerates the convergence of wave-equation inversion techniques. We have determined from testing on synthetic and field data that using the proposed dip-angle-domain specularity filter efficiently eliminates the kinematic artifacts in the delivered gathers. We expect involvement of the specularity filter to increase the reliability and quality of the seismic processing chain and provide a faster convergence of iterative methods for seismic inversion.

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“…The scatter is smeared along a circle in the image domain, and it is presented on several constant-dip images. We reorder the obtained images into dip-angle CIGs that correspond to a surface dip p. In the case of a laterally invariant medium, such surface dip-angle CIGs are similar to dip-angle gathers in depth, which are obtained after summing in the scattering-angle direction (e.g., Qin et al 2005). In the obtained CIGs, the specular reflections should be focused at positions that correspond to their dips in the data (Fig.…”

Section: E T H O Dmentioning

confidence: 99%

Poststack diffraction imaging using reverse-time migration

Silvestrov

Baina²,

Landa

2015

Geophysical Prospecting

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A B S T R A C TWe propose a method for imaging small-scale diffraction objects in complex environments in which Kirchhoff-based approaches may fail. The proposed method is based on a separation between the specular reflection and diffraction components of the total wavefield in the migrated surface angle domain. Reverse-time migration was utilized to produce the common image gathers. This approach provides stable and robust results in cases of complex velocity models. The separation is based on the fact that, in surface angle common image gathers, reflection events are focused at positions that correspond to the apparent dip angle of the reflectors, whereas diffracted events are distributed over a wide range of angles. The high-resolution radon-based procedure is used to efficiently separate the reflection and diffraction wavefields. In this study, we consider poststack diffraction imaging. The advantages of working in the poststack domain are its numerical efficiency and the reduced computational time. The numerical results show that the proposed method is able to image diffraction objects in complex environments. The application of the method to a real seismic dataset illustrates the capability of the approach to extract diffractions.

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Kirchhoff PreSDM interactive dip‐gather stacking and dip illumination panel generation

Cited by 25 publications

References 3 publications

Time-lapse analysis of sparse 3D seismic data from the CO2 storage pilot site at Ketzin, Germany

Time-lapse analysis of sparse 3D seismic data from the CO2 storage pilot site at Ketzin, Germany

Kinematic artifacts in the subsurface-offset extended image and their elimination by a dip-domain specularity filter

Poststack diffraction imaging using reverse-time migration

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