Imaging complex structures with semirecursive Kirchhoff migration

Bevc, Dimitri

doi:10.1190/1.1444167

Cited by 97 publications

(59 citation statements)

References 9 publications

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“…Taking the amplitudes of scattering into account is vital to accurately imaging complex structures such as the area near location A. All of the images in Figs.1(c)-(f) have similar quality and are comparable to the finite-difference migration image (Bevc, 1997).…”

Section: Prestack Migrations Of the Marmousi Datasetmentioning

confidence: 53%

“…Several interfaces merge into the region around A in Fig.1(a) and hence the wave phenomena in this region are complex. The image around location A in Fig.1(b) obtained using the SSF method is different from that obtained using a time-consuming but more accurate method, the finite-difference wave-equation migration algorithm provided by Advance Geophysical Co. (Bevc, 1997). This is because the split-step Fourier method uses a small-angle approximation of the extended local-Rytov Fourier method and accounts only for the phase changes but not for the amplitude changes of wavefields caused by lateral velocity variations.…”

Section: Prestack Migrations Of the Marmousi Datasetmentioning

confidence: 99%

“…Many improvements have been made to make the ray migration more reliable and different ray migration methods have been developed during last two decades (e.g. Wiggins, 1984;Keho and Beydoun, 1988;Zhu, 1988;Geoltrain and Brac, 1993;Gray and May, 1994;Moser, 1994;Fei et al, 1996;Bevc, 1997;Audebert et al, 1997;Hanitzsch, 1997;Hildebrand and Fehler, 1998;Tygel et al, 1998;Abma et al, 1999;Dellinger et al, 2000;Hokstad, 2000;Romero et al, 2000;Sun et al, 2000). To date, the ray-based migration method is still the most commonly used imaging tool in industry.…”

Section: Introductionmentioning

confidence: 99%

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Advanced Wave-Equation Migration

Huang¹,

Fehler²

2001

The 5th International Symposium on Recent Advances in Exploration Geophysics (RAEG 2001)

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Wave-equation migration methods can more accurately account for complex wave phenomena than ray-tracing-based Kirchhoff methods that are based on the high-frequency asymptotic approximation of waves. With steadily increasing speed of massively parallel computers, wave-equation migration methods are becoming more and more feasible and attractive for imaging complex 3D structures. We present an overview of several efficient and accurate wave-equation-based migration methods that we have recently developed. The methods are implemented in the frequency-space and frequency-wavenumber domains and hence they are called dualdomain methods. In the methods, we make use of different approximate solutions of the scalar-wave equation in heterogeneous media to recursively downward continue wavefields. The approximations used within each extrapolation interval include the Born, quasi-Born, and Rytov approximations. In one of our dual-domain methods, we use an optimized expansion of the square-root operator in the one-way wave equation to minimize the phase error for a given model. This leads to a globally optimized Fourier finitedifference method that is a hybrid split-step Fourier and finitedifference scheme. Migration examples demonstrate that our dualdomain migration methods provide more accurate images than those obtained using the split-step Fourier scheme. The Bornbased, quasi-Born-based, and Rytov-based methods are suitable for imaging complex structures whose lateral variations are moderate, such as the Marmousi model. For this model, the computational cost of the Born-based method is almost the same as the split-step Fourier scheme, while other methods takes approximately 15-50 per cent more computational time. The globally optimized Fourier finite-difference method significantly improves the accuracy of the split-step Fourier method for imaging structures having strong lateral velocity variations, such as the SEG/EAGE salt model, at an approximately 30 per cent greater computational cost than the split-step Fourier method.

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Section: Prestack Migrations Of the Marmousi Datasetmentioning

confidence: 53%

Section: Prestack Migrations Of the Marmousi Datasetmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Advanced Wave-Equation Migration

Huang¹,

Fehler²

2001

The 5th International Symposium on Recent Advances in Exploration Geophysics (RAEG 2001)

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“…While pre-stack depth migration is sensitive to velocity, even a tiny velocity error can decreasee the imaging quality (Versteeg, 1993;Bevc, 1997;Zhu et al, 1998;Herron, 2000). So the processing of smoothing need to be carefully treated.…”

Section: Introductionmentioning

confidence: 99%

Synthetic Analysis of Model Smoothing’s Influence on Ray Path, Traveltime and Migration Imaging

Sun¹

2017

Appl Ecol Env Res

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Abstract. Smoothing process might change the value of grid nodes in the migration model, which is essential to seismic imaging. We will study the influence of model smoothing on ray path and traveltime as well as their connections with the migration imaging. A deep-water velocity model is employed for the calculation. The numerical analysis shows that model smoothing has a significant influence on ray path and traveltime, these differences can affect the migration images. Optimal smoothing process is beneficial to achieve high-quality migration images, while inappropriate model smoothing could even change the shape of real geology body and lead to wrong geology structures in the migration sections.

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“…It can be divided ray-and wave equation-based method. Seismic migration based on ray methods such as Kirchhoff (Gray and May, 1994 [1], Bevc, 1997 [2]) and Gaussian beam method (Gray, 2005 [3]) is a popular imaging method for prestack and post stack data due to computing efficiency. While ray-based method offers efficient computation, it mostly uses single path ray tracing.…”

Section: Introductionmentioning

confidence: 99%

Prestack Depth Migration by a Parallel 3D PSPI

Jang¹,

Kim²

2016

IJG

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Prestack depth migration for seismic reflection data is commonly used tool for imaging complex geological structures such as salt domes, faults, thrust belts, and stratigraphic structures. Phase shift plus interpolation (PSPI) algorithm is a useful tool to directly solve a wave equation and the results have natural properties of the wave equation. Amplitude and phase characteristics, in particular, are better preserved. The PSPI algorithm is widely used in hydrocarbon exploration because of its simplicity, efficiency, and reduced efforts for computation. However, meaningful depth image of 3D subsurface requires parallel computing to handle heavy computing time and great amount of input data. We implemented a parallelized version of 3D PSPI for prestack depth migration using Open-Multi-Processing (Open MP) library. We verified its performance through applications to 3D SEG/EAGE salt model with a small scale Linux cluster. Phase-shift was performed in the vertical and horizontal directions, respectively, and then interpolated at each node. This gave a single image gather according to shot gather. After summation of each single image gather, we got a 3D stacked image in the depth domain. The numerical model example shows good agreement with the original geological model.

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Imaging complex structures with semirecursive Kirchhoff migration

Cited by 97 publications

References 9 publications

Advanced Wave-Equation Migration

Advanced Wave-Equation Migration

Synthetic Analysis of Model Smoothing’s Influence on Ray Path, Traveltime and Migration Imaging

Prestack Depth Migration by a Parallel 3D PSPI

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