Optimized Pseudo-Padé Fourier Migrator in Terms of Propagation Angles
A wide-angle Fourier migrator is proposed to more accurately image complex media with strong lateral velocity contrasts. The broadband wave-equation migrator is developed based on the pseudo-Padé approximation, where the Padé coefficients are independent of spatial coordinate...
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2020-01-01
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doaj-4d1c31dafaab4e639a736d1b73501bd12021-03-30T01:09:56ZengIEEEIEEE Access2169-35362020-01-018320543206510.1109/ACCESS.2020.29730428998240Optimized Pseudo-Padé Fourier Migrator in Terms of Propagation AnglesCong Tang0https://orcid.org/0000-0001-5444-5863Li-Yun Fu1Wenyong Pan2Qingqing Li3https://orcid.org/0000-0003-1600-8632Jianping Huang4State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, ChinaLaboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, ChinaEarth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, USAKey Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, ChinaKey Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, ChinaA wide-angle Fourier migrator is proposed to more accurately image complex media with strong lateral velocity contrasts. The broadband wave-equation migrator is developed based on the pseudo-Padé approximation, where the Padé coefficients are independent of spatial coordinates, leading to a pure Fourier transform-based matching solution for one-way wavefield extrapolation. We use genetic algorithms to estimate the constant Padé coefficients more accurately than is feasible with conventional least-squares methods. Because of the global features of pure Fourier migrators, we present an angle-partitioning optimization scheme with dip focusing to improve the performance of the Fourier migrator for super-wide-angle waves and strong velocity contrasts. The wavefield gradient is used to calculate propagation angles during dual-domain wavefield extrapolation. Particular attention is paid to the first-order optimized pseudo-Padé Fourier (OPF1) migrator, which significantly improves the split-step Fourier (SSF) method for strong lateral variations at the cost of one additional Fourier transform in each step. Wavefield extrapolation based on the OPF1 method actually constitutes linear interpolation in the wavenumber domain between two split-step terms. We benchmark the OPF1 migrator with other typical migrators based on the exact dispersion equation. Numerical experiments with impulse responses, the SEG/EAGE salt model and 3D field data demonstrate the excellent performance and efficiency of seismic imaging with the OPF1 migrator.https://ieeexplore.ieee.org/document/8998240/Angle-partitioning optimizationdual-domain Fourier migratorgenetic algorithm (GA)pseudo-Padé series approximationsuper-wide-angle imaging |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Cong Tang Li-Yun Fu Wenyong Pan Qingqing Li Jianping Huang |
spellingShingle |
Cong Tang Li-Yun Fu Wenyong Pan Qingqing Li Jianping Huang Optimized Pseudo-Padé Fourier Migrator in Terms of Propagation Angles IEEE Access Angle-partitioning optimization dual-domain Fourier migrator genetic algorithm (GA) pseudo-Padé series approximation super-wide-angle imaging |
author_facet |
Cong Tang Li-Yun Fu Wenyong Pan Qingqing Li Jianping Huang |
author_sort |
Cong Tang |
title |
Optimized Pseudo-Padé Fourier Migrator in Terms of Propagation Angles |
title_short |
Optimized Pseudo-Padé Fourier Migrator in Terms of Propagation Angles |
title_full |
Optimized Pseudo-Padé Fourier Migrator in Terms of Propagation Angles |
title_fullStr |
Optimized Pseudo-Padé Fourier Migrator in Terms of Propagation Angles |
title_full_unstemmed |
Optimized Pseudo-Padé Fourier Migrator in Terms of Propagation Angles |
title_sort |
optimized pseudo-padé fourier migrator in terms of propagation angles |
publisher |
IEEE |
series |
IEEE Access |
issn |
2169-3536 |
publishDate |
2020-01-01 |
description |
A wide-angle Fourier migrator is proposed to more accurately image complex media with strong lateral velocity contrasts. The broadband wave-equation migrator is developed based on the pseudo-Padé approximation, where the Padé coefficients are independent of spatial coordinates, leading to a pure Fourier transform-based matching solution for one-way wavefield extrapolation. We use genetic algorithms to estimate the constant Padé coefficients more accurately than is feasible with conventional least-squares methods. Because of the global features of pure Fourier migrators, we present an angle-partitioning optimization scheme with dip focusing to improve the performance of the Fourier migrator for super-wide-angle waves and strong velocity contrasts. The wavefield gradient is used to calculate propagation angles during dual-domain wavefield extrapolation. Particular attention is paid to the first-order optimized pseudo-Padé Fourier (OPF1) migrator, which significantly improves the split-step Fourier (SSF) method for strong lateral variations at the cost of one additional Fourier transform in each step. Wavefield extrapolation based on the OPF1 method actually constitutes linear interpolation in the wavenumber domain between two split-step terms. We benchmark the OPF1 migrator with other typical migrators based on the exact dispersion equation. Numerical experiments with impulse responses, the SEG/EAGE salt model and 3D field data demonstrate the excellent performance and efficiency of seismic imaging with the OPF1 migrator. |
topic |
Angle-partitioning optimization dual-domain Fourier migrator genetic algorithm (GA) pseudo-Padé series approximation super-wide-angle imaging |
url |
https://ieeexplore.ieee.org/document/8998240/ |
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