Model based processing (III): pseudo‐space reverse time migration

Wang, Xiutian; Xia, Dongming; Li, Jinshan; Tang, Qingbing; Jiang, Xuejun

doi:10.1190/1.2148060

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…One of the major problems that affect the application of reverse-time migration is that the wideangle capability of full-wave propagator can generate spurious cross correlations from diving waves and back-scattered waves, and causes serious artifacts (Yoon, et al, 2004;Mulder and Plessix, 2004;Fletcher, et al, 2005;Wang, et al, 2005). Special techniques such as velocity model smoothing or interface impedance matching have been introduced to solve this problem.…”

Section: Introductionmentioning

confidence: 99%

“…Although the reverse-time migration is a relatively expensive method, the development of computer hardware and software (remarkably the popularities of PC clusters and Linux operating system) plus the ever increasing interests to explore complex structures in challenging regions stimulated recent interest to this method (e.g., Wu, et al, 1996;Mufti, et al, 1996;Sun and McMechanz, 2001;Biondi and Shan, 2002;Yoon, et al, 2003Yoon, et al, , 2004Mulder and Plessix, 2004;Fletcher, et al, 2005;Wang, et al, 2005;Hou and Marfurt, 2005). …”

Section: Introductionmentioning

confidence: 99%

“…Fletcher, et al (2005) tried to eliminate the artifacts by introducing a directional damping term in areas where unwanted reflections occur. Wang et al (2005) proposed a pseudospace method by using a space distortion to transform a heterogeneous velocity model into a homogeneous model where no reflections were generated.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

High Resolution/High Fidelity Seismic Imaging and Parameter Estimation for Geological Structure and Material Characterization

Wu¹,

Xie²

2008

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High Resolution/High Fidelity Seismic Imaging and Parameter Estimation for Geological Structure and Material Characterization

Wu¹,

Xie²

2008

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A depth migration method based on the full‐wave reverse‐time calculation and local one‐way propagation

Xie

2006

SEG Technical Program Expanded Abstracts 2006

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A depth migration method combining the full-wave reverse-time calculation and local one-way propagation is proposed. The full-wave finite-difference propagator is used to extrapolate the source and receiver waves in the model. The wavefields are extracted from selected locations and then a local one-way propagator is used to extrapolate the wavefield towards different directions. The one-way propagator is also served as a one-way filter, separating waves propagating along different directions. Finally, the image is calculated from directional waves generated by the one-way propagator and the artifacts from backscattered waves of both source and receiver sides are effectively eliminated. This method also dramatically reduces the size of output files which is important when dealing with large 3D models.

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Elastic reverse time migration based on first-order velocity-dilatation-rotation equations using the optical flow vector

Xie,

Wang,

Song

et al. 2024

GEOPHYSICS

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The determination of the P- and S-wave propagation directions is crucial for achieving wavefield decomposition, polarity reversal correction, and noise suppression in elastic reverse time migration (RTM). Compared with the conventional decoupled elastic wave equation, the first-order velocity-dilatation-rotation equations enable a more accurate computation of propagation directions for P- and S-waves. Moreover, compared with the Poynting vector, the optical flow vector signifies the wavefield propagation directions more accurately. To effectively enhance the accuracy of elastic wave imaging, we propose an elastic RTM based on first-order velocity-dilatation-rotation equations using the optical flow vector. Numerical tests illustrate that the proposed method, with or without noise, can better eliminate the migration artifacts and improve the imaging accuracy of the elastic RTM than conventional methods, achieving more accurate wavefield decomposition and superior S-wave polarity reversal correction.

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Model based processing (III): pseudo‐space reverse time migration

Cited by 4 publications

References 7 publications

High Resolution/High Fidelity Seismic Imaging and Parameter Estimation for Geological Structure and Material Characterization

High Resolution/High Fidelity Seismic Imaging and Parameter Estimation for Geological Structure and Material Characterization

A depth migration method based on the full‐wave reverse‐time calculation and local one‐way propagation

Elastic reverse time migration based on first-order velocity-dilatation-rotation equations using the optical flow vector

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