True‐amplitude Kirchhoff migration from topography

Jäger, C.; Hertweck, Thomas; Spinner, Miriam

doi:10.1190/1.1818089

Cited by 15 publications

(6 citation statements)

References 5 publications

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“…A Kirchhoff prestack depth migration for topography (Jäger, Hertweck and Spinner 2003; Hertweck 2004) was applied. We used the prestack data after residual static correction together with the macro‐velocity model obtained by the tomographic inversion (Fig.…”

Section: Real Data Examplementioning

confidence: 99%

CRS‐stack‐based seismic imaging considering top‐surface topography

Heilmann

Mann

Koglin

2006

Geophysical Prospecting

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In this case study we consider the seismic processing of a challenging land data set from the Arabian Peninsula. It suffers from rough top‐surface topography, a strongly varying weathering layer, and complex near‐surface geology. We aim at establishing a new seismic imaging workflow, well‐suited to these specific problems of land data processing. This workflow is based on the common‐reflection‐surface stack for topography, a generalized high‐density velocity analysis and stacking process. It is applied in a non‐interactive manner and provides an entire set of physically interpretable stacking parameters that include and complement the conventional stacking velocity. The implementation introduced combines two different approaches to topography handling to minimize the computational effort: after initial values of the stacking parameters are determined for a smoothly curved floating datum using conventional elevation statics, the final stack and also the related residual static correction are applied to the original prestack data, considering the true source and receiver elevations without the assumption of nearly vertical rays. Finally, we extrapolate all results to a chosen planar reference level using the stacking parameters. This redatuming procedure removes the influence of the rough measurement surface and provides standardized input for interpretation, tomographic velocity model determination, and post‐stack depth migration. The methodology of the residual static correction employed and the details of its application to this data example are discussed in a separate paper in this issue. In view of the complex near‐surface conditions, the imaging workflow that is conducted, i.e. stack – residual static correction – redatuming – tomographic inversion – prestack and post‐stack depth migration, leads to a significant improvement in resolution, signal‐to‐noise ratio and reflector continuity.

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Section: Real Data Examplementioning

confidence: 99%

CRS‐stack‐based seismic imaging considering top‐surface topography

Heilmann

Mann

Koglin

2006

Geophysical Prospecting

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“…A Kirchhoff prestack depth migration for topography (Jäger et al, 2003;Hertweck, 2004) was applied. We used the prestack data after residual static correction together with the macrovelocity model obtained by the tomographic inversion ( Figure 6).…”

Section: Depth Migrationmentioning

confidence: 99%

CRS‐stack‐based seismic imaging for land data—a case study from Saudi Arabia

Heilmann

Koglin

2006

SEG Technical Program Expanded Abstracts 2006

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In this case study we are giving attention to the seismic processing of a challenging land data set from the Arabian Peninsula. It suffers from rough top-surface topography, a strongly varying weathering layer, and complex near-surface geology. Particularly for land data, the increased computational expense required by the generalized high-density velocity analysis preceding the Common-Reflection-Surface stack process often proves to be worthwhile. In order to define optimal spatial stacking operators, we determine for every sample of the zerooffset section an entire set of physically interpretable stacking parameters. These so-called kinematic wavefield attributes can be applied to solve various dynamic and kinematic stacking, modeling, and inversion problems. By this means, a very flexible CRS-stack-based seismic reflection imaging workflow can be established. The main steps of this workflow are, besides the stack itself, residual static correction, determination of a macrovelocity model via tomographic inversion, and Kirchhoff depth migration. The presented extension of this imaging workflow supports arbitrary top-surface topography. Both, stack and stack-based residual static correction are applied to the original prestack data without the need of any elevation statics. Finally, a redatuming procedure relates the stacked zero-offset section, the kinematic wavefield attribute sections, and the quality control sections to a chosen planar measurement level.

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“…Gray and Marfurt (1995) proved that Kirchhoff migration performed directly from topography can be more advantageous as opposed to fi rst applying redatuming. Jager et al (2003) presented a true amplitude Kirchhoff migration with rugged topography.…”

Section: Introductionmentioning

confidence: 97%

Prestack Gaussian beam depth migration under complex surface conditions

Yue

Zhang³

et al. 2010

Appl. Geophys.

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In areas with a complex surface, the acquisition and processing of seismic data is a great challenge. Although elevation-static corrections can be used to eliminate the infl uences of topography, the distortions of seismic wavefields caused by simple vertical time shifts still greatly degrade the quality of the migrated images. Ray-based migration methods which can extrapolate and image the wavefi elds directly from the rugged topography are effi cient ways to solve the problems mentioned above. In this paper, we carry out a study of prestack Gaussian beam depth migration under complex surface conditions. We modify the slant stack formula in order to contain the information of surface elevations and get an improved method with more accuracy by compositing local plane-wave components directly from the complex surface. First, we introduce the basic rules and computational procedures of conventional Gaussian beam migration. Then, we give the original method of Gaussian beam migration under complex surface conditions and an improved method in this paper. Finally, we validate the effectiveness of the improved method with trials of model and real data.

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True‐amplitude Kirchhoff migration from topography

Cited by 15 publications

References 5 publications

CRS‐stack‐based seismic imaging considering top‐surface topography

CRS‐stack‐based seismic imaging considering top‐surface topography

CRS‐stack‐based seismic imaging for land data—a case study from Saudi Arabia

Prestack Gaussian beam depth migration under complex surface conditions

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