Abstract
Anisotropy correction is necessary during the processing of converted PSwave seismic data to achieve accurate structural imaging, reservoir prediction, and fracture detection. To effectively eliminate the adverse effects of S-wave splitting and to improve PSwave imaging quality, we tested methods for pre-stack migration imaging and anisotropic correction of PS-wave data. We based this on the propagation rules of seismic waves in a horizontal transverse isotropy medium, which is a fractured medium model that reflects likely subsurface conditions in the field. We used the radial (R) and transverse (T) components of PS-wave data to separate the fast and slow S-wave components, after which their propagation moveout was effectively extracted. Meanwhile, corrections for the energies and propagation moveouts of the R and T components were implemented using mathematical rotation. The PS-wave imaging quality was distinctly improved, and we demonstrated the reliability of our methods through numerical simulations. Applying our methods to three-dimensional and three-component seismic field data from the Xinchang-Hexingchang region of the Western Sichuan Depression in China, we obtained high-quality seismic imaging with continuous reflection wave groups, distinct structural features, and specific stratigraphic contact relationships. This study provides an effective and reliable approach for data processing that will improve the exploration of complex, hidden lithologic gas reservoirs.
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This work was supported by the National Natural Science Foundation of China (Grant No. 41574099) and the National Key Science and Technology Special Projects (grant No. 2016ZX05002004-005).
Yan Li-Li. is a Ph.D. student studying Quaternary geology at the Chengdu University of Technology. Her research interests are seismic wave propagation theory and application technology, geological structures and Quaternary environments.
Cheng Bing-Jie is an associate professor at the Chengdu University of Technology. She obtained her bachelor’s degree in applied geophysics from the China University of Geosciences (Wuhan) in 2000 and received a master's degree in Earth exploration and information technology from the same university in 2003. She received her PhD from the Institute of Geology and Geophysics of the Chinese Academy of Sciences in 2007. Her main research interests are seismic anisotropy analysis, multi-component seismic exploration, and reservoir prediction methods.
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Yan, LL., Cheng, BJ., Xu, TJ. et al. Study and application of PS-wave pre-stack migration in HTI media and an anisotropic correction method. Appl. Geophys. 15, 57–68 (2018). https://doi.org/10.1007/s11770-018-0660-2
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DOI: https://doi.org/10.1007/s11770-018-0660-2