Zero‐velocity layer: Migration from irregular surfaces

Beasley, Craig J.; Lynn, Walt

doi:10.1190/1.1889544

Cited by 17 publications

(14 citation statements)

References 2 publications

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“…Applying elevation statics as an approximation to wave-equation datuming has caused the migrated image to be extremely distorted in the near-surface. To make matters worse for velocity estimation purposes, this image was obtained using velocities much lower than the actual interval velocities; using the actual velocities in the migration would have yielded an even poorer image (Beasley and Lynn 1992). The images in Figs 2b and c show considerable improvement over the image in Fig.…”

Section: Processing From Topographymentioning

confidence: 99%

“…Alternatively, to accomplish the same goal, we could retain the elevation statics, and migrate using a zero-velocity layer between the earth's surface and a datum level. Migrating from topography allows us to produce a clear image, especially in the near-surface, without using artificially low velocities to compensate for the effects of elevation statics (Beasley and Lynn 1992). Migration from topography is critical for prestack depth migration, where velocity estimation is one of the goals of the imaging process.…”

Section: Processing From Topographymentioning

confidence: 99%

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Crooked line, rough topography: advancing towards the correct seismic image

Gray

Maclean

Marfurt³

1999

Geophysical Prospecting

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Seismic exploration in mountainous areas imposes serious compromises on both acquisition and processing. Access restrictions usually result in profiles that are not straight and are not recorded along the true dip direction (if there is a true dip direction!). Processing constraints often result in very poor approximate corrections for elevations and for deviations from a straight line. Most fundamentally, 2D acquisition and processing assumes that the earth is 2D; this assumption is often seriously violated in mountainous areas. While we cannot efficiently correct 2D seismic data for the effects of a fully 3D subsurface, we can improve the data quality in thrust areas where the assumption of 2D subsurface variation is reasonable. We do this in a series of small steps, which improves the accuracy of several approximations made in processing 2D land data.

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Section: Processing From Topographymentioning

confidence: 99%

Section: Processing From Topographymentioning

confidence: 99%

Crooked line, rough topography: advancing towards the correct seismic image

Gray

Maclean

Marfurt³

1999

Geophysical Prospecting

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show abstract

“…His method can perform the migration from any non-plane surface. Beasley [13] proposed the "zero-velocity layer" concept to overcome the impact of complex terrain. This technology requires time shift static correction before migration, and only adapts to migration operators with the combination of diffraction and refraction terms.…”

Section: Introductionmentioning

confidence: 99%

Pre‐Stack Reverse Time Migration for Rugged Topography and GPU Acceleration Technology

Liu

et al. 2011

Chinese J of Geophysics

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Pre-stack reverse time migration (RTM) for rugged topography is a very useful tool for seismic imaging in the areas with strong relief on the surface and complex subsurface structures. In this paper, we illustrate the implementation process of RTM for rugged topography. To deal with the difficulty of dealing with the rugged free boundary condition with the finite difference method, we employ a simplified boundary condition which could avoid the abundant logical judgment. On this basis, we use the Graphic Processing Unit (GPU) architecture to accelerate RTM and get an order of magnitude higher speedup ratio compared to the traditional CPU architecture. The tests on synthetic data examples and comparison with the pre-stack one-way wave method for rugged topography prove that RTM does not have the imaging dip limit, and the imaging results for the areas with rugged surface topography and subsurface steep structures are significantly improved. The problems of imaging noise removal and massy memory demand of RTM have been stated in our previous paper and will not be discussed here.

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“…Beasley and Lynn [3] proposed the zero-layer idea to compensate for the shortcoming of the static correction. Schneider et al [4] performed a complete datuming operation for the overthrust-data by the Kirchhoff integral operator according to the idea of the prestack layer replacement.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Application of the 3‐D Wave‐Equation‐Datuming

Yang

Cheng

Liu

et al. 2007

Chinese J of Geophysics

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The wave-equation-datuming (WED) technique is a necessary alternative to the conventional static corrections when the surface-consistent assumption is invalid. Much pervious work had been done on the 2-D cases which demonstrated its applicability potential to be extended to 3-D. In this paper, a "step-by-step" recursive 3-D frequency-space WED scheme is presented to deal with real data. The processing results revealed that 3-D WED is a more reasonable datum-correction method thereby the accuracy of velocity analysis and the imaging quality are improved significantly.

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Zero‐velocity layer: Migration from irregular surfaces

Cited by 17 publications

References 2 publications

Crooked line, rough topography: advancing towards the correct seismic image

Crooked line, rough topography: advancing towards the correct seismic image

Pre‐Stack Reverse Time Migration for Rugged Topography and GPU Acceleration Technology

A Study on the Application of the 3‐D Wave‐Equation‐Datuming

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