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Though prevents one from using wave-equationstyle closed-form solutions are known for special medium profiles, pre-stack depth migration, in practice. Approximations in general inhomogeneous media, only asymptotic of these extrapolators, such as the split-step Fourier and uniform expansions of the VSLS exist. We will use approach (Stoffa et al., 1990) and the generalized an asymptotic expansion for our accuracy analysis, the screen method (De Hoop and Wu, 1996) including the leading order of which is representative for the arrival phase-screens, the complex-screens, and the wide-anglescreens times of the waves.
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The phase-shift plus interpolation (PSPI) was hence developed by Gazdag and We develop a prestack depth migration method for Sguazzero (1984) as one way to handle lateral velocity common-shot gathers using the wide-angle-screen and variations. It is a dual-domain method. Several phase-screen propagators as recursive downward wave constant references velocities are used in the PSPI to extrapolators. These screen propagators are acoustic perform phase-shift migrations for each depth interval one-way wave propagators carried out in the dualdomain and the corresponding migration results are interpolated (wavenumber-space domain). The proposed to yield the final migrated image. The PSPI migration method takes into account lateral velocity would be very time-consuming for imaging large 3D and density variations and implements exactly the complex structures because many reference velocities transversal Laplacian operators in the acoustic wave have to be selected for these cases.
Massively Parallel Computing of 3-D Prestack Depth Migration Using Phase-screen Propagators
Kao, Jason C. (Cray Research, Inc.) | Huang, Lian-Jie (Institute of Tectonics, University of California, Santa Crux) | Wu, Ru-Shan (Institute of Tectonics, University of California, Santa Crux) | Buland, A. (IKU Petroleum Research)
T3D Massively Parallel Processors (MPP) to demonstrate An alternative of the prestack imaging procedure in the efficiency of the phase-screen migration the frequency domain has recently proposed by Huang method by migrating common-shot gathers in 3-D heterogeneous and Wu (1996).