Abstract
Seismic responses generated from small-scale discontinuous geologic structures are encoded into weak diffractions. Thus, diffraction imaging has great potential for providing high-resolution structural and stratigraphic sections for interpreters. Because diffractions behave as weak signals and are easily masked by strong reflections, diffraction separation from specular reflections is a necessary processing step for high-resolution diffraction imaging. However, most diffraction-separation methods are performed in the post-stack or common-offset domains, while ignoring prestack information or requiring perfect data acquisition. Furthermore, prestack separation methods usually consider the combination of two diffraction-separation technologies; thus, the corresponding results depend on several different parameters. To deal with these problems, we propose a plane-wave destruction (PWD)-based workflow for prestack diffraction separation in the shot domain that uses the differences in the local slopes between reflections and diffractions. The new diffraction-separation workflow extends the application of PWD from the poststack to the prestack domain without additional technology, and the shot-domain data have the advantage of the waveform consistency and continuity. The plane-wave trace prediction algorithm derived from plane-wave equation is considered for predicting and flattening strong reflections in the shot domain. A plane-wave filter based on regularized slope prediction is used for attenuating flat reflections and enhancing weak diffractions. Synthetic and field examples demonstrate the feasibility of the proposed workflow in identifying and locating small-scale discontinuous bodies.
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Data Availability Statement
The data associated with this research are available from the corresponding author upon reasonable request.
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Acknowledgements
This research is supported by Green, Intelligent and Safe Mining for Coal Resources (Grant No. 52121003), the National Natural Science Foundation of China (Grant No. 42104139, 42022031, 41874157), National Key Research and Development Program of China (Grant No.2020YFE0201300), China Postdoctoral Science Foundation (Grant No. 2021M693426), Open Fund of State Key Laboratory of Coal Resources and Safe Mining (Grant No. SKLCRSM21KFA02), Fundamental Research Funds for the Central Universities (Grant No. 2021JCCXMT0, 2602020RC130), and the 111 project (Grant No. B18052). We thank Jingtao Zhao for the constructive discussions and Peng Research Group in CUMTB for financial support of this work.
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Lin, P., Peng, S., Huang, X. et al. Plane-Wave Destruction-Based Workflow for Prestack Diffraction Separation in the Shot Domain. Pure Appl. Geophys. 179, 2215–2229 (2022). https://doi.org/10.1007/s00024-022-03034-8
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DOI: https://doi.org/10.1007/s00024-022-03034-8