Abstract
Angle-domain common-image gathers (ADCIGs) transformed from the shotdomain common-offset gathers are input to migration velocity analysis (MVA) and prestack inversion. ADCIGs are non-illusion prestack inversion gathers, and thus, accurate. We studied the extraction of elastic-wave ADCIGs based on amplitude-preserving elastic-wave reversetime migration for calculating the incidence angle of P-and S-waves at each image point and for different source locations. The P-and S-waves share the same incident angle, namely the incident angle of the source P-waves. The angle of incidence of the source P-wavefield was the difference between the source P-wave propagation angle and the reflector dips. The propagation angle of the source P-waves was obtained from the polarization vector of the decomposed P-waves. The reflectors’ normal direction angle was obtained using the complex wavenumber of the stacked reverse-time migration (RTM) images. The ADCIGs of P-and S-waves were obtained by rearranging the common-shot migration gathers based on the incident angle. We used a horizontally layered model, the graben medium model, and part of the Marmousi-II elastic model and field data to test the proposed algorithm. The results suggested that the proposed method can efficiently extract the P-and S-wave ADCIGs of the elastic-wave reverse-time migration, the P-and S-wave incident angle, and the angle-gather amplitude fidelity, and improve the MVA and prestack inversion.
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Acknowledgments
We thank Dr. Ding Ren-Wei, Dr. Tong Si-You, and Dr. Chen Ke-Yang for suggestions and constructive comments.
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This work is supported by Financially Supported by Qingdao National Laboratory for Marine Science and Technology (No.QNLM2016ORP0206), National Science and Technology Major Project (No. 2016ZX05027-002), China Postdoctoral Science Foundation (No. 2017M612219), National Key R&D Plan (Nos. 2017YFC0306706 and 2017YFC0307400), Financially Supported by Qingdao National Laboratory for Marine Science and Technology (No.QNLM201708), Natural Sci ence Foundation of Shandong Province (No. ZR2016DB10), National Natural Science Foundation of China (Nos. 41674118, 41504109, and 41506084), Key Laboratory of Submarine Geosciences Foundation of SOA (No. KLSG1603), and Qingdao Municipal Applied Research Projects (No. 2016238).
Yang Jia-Jia received her PhD in geophysical prospecting in 2015 from Ocean University of China. She is presently a postdoctoral fellow at the Qingdao Institute of Marine Geology. Her research interests are seismic wave theory and multi-technology and multicomponent seismic wave reversetime depth migration.
Corresponding author: Luan Xi-Wu, a researcher, doctoral supervisor, and got him PhD Degree in 1999 from Institute of oceanology, Chinese Academy of Sciences Majoring Marine Geology. Now he works in Qingdao Institute of Marine Geology as deputy director of Function Laboratory for Marine Mineral Resource Geology and Exploration mainly engaged in marine geophysical research.
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Yang, JJ., Luan, XW., He, BS. et al. Extraction of amplitude-preserving angle gathers based on vector wavefield reverse-time migration. Appl. Geophys. 14, 492–504 (2017). https://doi.org/10.1007/s11770-017-0650-9
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DOI: https://doi.org/10.1007/s11770-017-0650-9