A fast and low cost alternative to subsalt wave equation migration perturbation scans

Wang, Bin; Qin, Fuhao; Audebert, F.; Dirks, Volker

doi:10.1190/1.2148166

Cited by 14 publications

(7 citation statements)

References 4 publications

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“…The second step is to perform 2D demigration on all available lines. Demigration is performed to generate data closely resembling 2D stacks at zero-offset, which would be expected to tie at intersections and largely have the effects of velocity inconsistencies removed (Wang et al, 2005). Any small residual discrepancies at line intersections are corrected in a manner minimizing structural changes.…”

Section: Methodsmentioning

confidence: 99%

3D imaging from 2D seismic data, an enhanced methodology

Whiteside¹,

Wang²,

Bondeson³

et al. 2013

SEG Technical Program Expanded Abstracts 2013

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We have developed an enhanced methodology for creating a 3D seismic migration volume from a set of 2D seismic lines. The key challenge is to interpolate coarsely spaced 2D seismic lines into a dense 3D seismic volume before performing a post-stack migration. This requires interpolation across distances far in excess of standard seismic interpolation approaches' limitations. Building a geologic time model which essentially consists of a dense set of automatically generated geological time horizons and using them to guide the interpolation is a practical approach to address the coarse sampling issue. Successful application of the enhanced methodology to a data example from the North Sea demonstrates its effectiveness.

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Section: Methodsmentioning

confidence: 99%

3D imaging from 2D seismic data, an enhanced methodology

Whiteside¹,

Wang²,

Bondeson³

et al. 2013

SEG Technical Program Expanded Abstracts 2013

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“…Figure 2 shows the flow chart of this prediction method. The method consists of the following major steps: 1) Perform a poststack wave-equation based demigration to get an estimate of the zero-offset (post-stack-time) wavefield (Wang et al, 2005), using the depth migration image as the reflectivity model, and the migration velocity model. 2) Obtain an estimate of the multiple model wavefield in the time domain, using the demigrated wavefield as input and adding a round-trip forward WFE.…”

Section: Poststack Wfe Multiple Predictionmentioning

confidence: 99%

Postmigration multiple prediction and removal in the depth domain

Wang¹,

Cai²,

Guo³

et al. 2011

GEOPHYSICS

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We have developed a new methodology for predicting and removing multiples in the postmigration depth domain based on wavefield extrapolation and attribute-based subtraction. The inputs for the multiple prediction are a 3D prestack depth-migrated stack volume and the corresponding migration velocity volume. The output is the predicted multiple model in the migration depth domain. In some cases, the strong residual top of salt multiple may be erroneously picked as the base of salt reflection. With the predicted multiple model available for comparison during the salt model building stage, there is a better chance of building an accurate salt model and avoid picking multiple events. In an effort to further improve the final migrated images, the predicted multiple model is used to remove residual multiples in the migration depth domain. A poststack wavefield extrapolation-based multiple prediction is used to identify and confirm the multiple events in the migration depth domain. Once multiple events are identified, an effective and efficient demultiple technique is applied to remove the residual multiples from the final migration. The key ingredient of this new demultiple methodology is the attribute-based subtraction. We describe the main steps of this methodology and demonstrate its effectiveness by showing some field data applications.

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“…To use the efficient, and yet high quality, post-migration algorithm for complex subsalt imaging, we start with a migrated image. On this migrated image we perform an upgoing wave-equation-based post-stack demigration to a equation based demigration to get the zero-offset (post-stack) wavefield (Wang et al, 2005). The whole process of downgoing pre-stack migration followed by upgoing demigration effectively achieved a wavefield redatuming from the surface to the subsurface datum.…”

Section: Interactive Imaging For Salt Model Buildingmentioning

confidence: 99%

“…By effectively redatuming the wavefield from the surface to a subsurface datum, the resulting wavefield is greatly simplified (Figure 1c). If data recorded on the surface were to be used, the wavefield would become very complex with many crossing events as it propagates across high-velocity contrasts such as the TOS (Wang et al, 2005). With a simplified wavefield, some critical steps of beam migration (Wang et al, 2008b) such as dip scanning and picking are more accurate, resulting in better quality subsalt beam migration images.…”

Section: Layer-stripping Rtm For Salt Model Buildingmentioning

confidence: 99%