Abstract
Various migration methods have been proposed to image high-angle geological structures and media with strong lateral velocity variations; however, the problems of low precision and high computational cost remain unresolved. To describe the seismic wave propagation in media with lateral velocity variations and to image high-angle structures, we propose the generalized screen propagator based on particle swarm optimization (PSO-GSP), for the precise fitting of the single-square-root operator. We use the 2D SEG/EAGE salt model to test the proposed PSO-GSP migration method to image the faults beneath the salt dome and compare the results to those of the conventional high-order generalized screen propagator (GSP) migration and split-step Fourier (SSF) migration. Moreover, we use 2D marine data from the South China Sea to show that the PSO-GSP migration can better image strong reflectors than conventional imaging methods.
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Acknowledgments
The authors wish to thank Ye Yue-Ming, Wu Bang-Yu, and Fang Gang, Dr. Fang Yuan of the China Geological Survey, and Dr. Liu Zhi-Wei of the Chinese Academy of Geological Sciences for comments and suggestions.
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This research work is supported by the 863 Program of China (No. 2013AA064201) and National Science and Technology Major Project (No. 2016ZX05003-003).
He Run is a PhD student at the China University of Geoscience (Beijing). His research interests are migration imaging and reservoir prediction.
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He, R., You, JC., Liu, B. et al. High-order generalized screen propagator migration based on particle swarm optimization. Appl. Geophys. 14, 64–72 (2017). https://doi.org/10.1007/s11770-017-0602-4
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DOI: https://doi.org/10.1007/s11770-017-0602-4