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Applied Geophysics

, Volume 14, Issue 4, pp 492–504 | Cite as

Extraction of amplitude-preserving angle gathers based on vector wavefield reverse-time migration

  • Jia-Jia Yang
  • Xi-Wu Luan
  • Bing-Shou He
  • Gang Fang
  • Jun Pan
  • Wei-Min Ran
  • Tao Jiang
Article
  • 39 Downloads

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.

Keywords

Elastic wave reverse-time migration vector wavefield angle-domain commonimage gathers amplitude-preserving migration 

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Notes

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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Copyright information

© Editorial Office of Applied Geophysics and Springer-Verlag GmbH Germany, part of Springer Nature 2017

Authors and Affiliations

  • Jia-Jia Yang
    • 1
    • 2
  • Xi-Wu Luan
    • 1
    • 2
  • Bing-Shou He
    • 2
    • 3
  • Gang Fang
    • 1
    • 2
  • Jun Pan
    • 1
    • 2
  • Wei-Min Ran
    • 1
    • 3
  • Tao Jiang
    • 1
  1. 1.The Key Laboratory of Marine Hydrocarbon Resource and Environment Geology, Ministry of Land and ResourcesQingdao Institute of Marine GeologyQingdaoChina
  2. 2.Function Laboratory for Marine Mineral Resource Geology and ExplorationNational Laboratory for Marine Science and TechnologyQingdaoChina
  3. 3.Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of EducationOcean University of ChinaQingdaoChina

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