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Three-dimensional angle-domain double-square-root migration in VTI media for the large-scale wide-azimuth seismic data

  • Research Article - Applied Geophysics
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Abstract

With the development of oil and gas exploration, the conventional seismic migration imaging technology based on the isotropic assumption no longer meets our current requirements for high-resolution images. Migration in anisotropic media has become an essential requirement for oil and gas exploration. Marine seismic exploration has gradually entered the wide-azimuth and high-density seismic data acquisition stage. However, even for current large high-performance computer clusters, it is still very difficult to implement pre-stack depth migration based on shot gathers. Thus, we present a double-square-root (DSR) equation based on three-dimensional (3D) pre-stack depth migration in midpoint-offset domain for a wide-azimuth dataset in transversely isotropic media with a vertical symmetry axis (VTI media). Considering VTI media, the DSR migration requires extensive memory and computation; we adopted the phase-shift plus interpolation approach to improve the computational efficiency. Then, we extract the angle-domain common-image gathers (ADCIGs) during DSR migration. For real large-scale seismic data, we designed an effective parallel implementation of 3D DSR migration with ADCIGs outputs. Finally, we applied the proposed angle-domain VTI DSR migration on wide-azimuth SEG/EAGE salt dome-based data and real data from the China South Sea. Numerical and practical data illustrate the effectiveness of the proposed method.

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Acknowledgements

The authors thank the sponsors of WPI group for their financial support and help. WPI’s research works are also financially supported by National Key R&D Program of China (2019YFC0312004, 2018YFA0702503), National Natural Science Foundation of China (41774126), the great and special project (2016ZX05024-001, 2016ZX05006-002). We kindly acknowledge FFTW Free Software for the computation. We really appreciate the associate editor and Tariq Alkhalifah and an anonymous reviewer for providing so many useful comments and suggestions to improve the clarity and completeness of this manuscript.

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  1. Wave Phenomena and Intelligent Inversion Imaging Group (WPI), School of Ocean and Earth Science, Tongji University, Shanghai, 200092, China

    Chengliang Wu, Bo Feng, Huazhong Wang & Tianzhen Wang

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  1. Chengliang Wu
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  2. Bo Feng
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  3. Huazhong Wang
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Correspondence to Bo Feng.

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Wu, C., Feng, B., Wang, H. et al. Three-dimensional angle-domain double-square-root migration in VTI media for the large-scale wide-azimuth seismic data. Acta Geophys. 68, 1021–1037 (2020). https://doi.org/10.1007/s11600-020-00450-z

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