1887
Volume 72, Issue 7
  • E-ISSN: 1365-2478

Abstract

Abstract

Multicomponent seismic technology utilizes the kinematic and dynamic characteristics of reflected P‐waves and converted S‐waves to reduce ambiguity in seismic exploration. The imaging and inversion accuracy of P‐SV‐converted waves are important in determining whether multicomponent seismic exploration can achieve higher exploration accuracy than conventional P‐wave exploration. Pre‐stack inversion of P‐SV‐converted waves requires precise input of P‐SV‐converted wave angle‐domain common‐image gathers. Consequently, the P‐SV‐converted wave angle‐domain common‐image gather extraction accuracy will significantly affect the P‐SV‐converted wave inversion accuracy. However, existing methods for extracting P‐SV‐converted wave angle‐domain common‐image gathers are constrained by issues such as the P‐ and S‐wave crosstalk artefacts, low‐frequency noises and inaccurate calculation of P‐wave incident angles, leading to poor imaging accuracy. We study an angle‐domain cross‐correlation imaging condition and address three key issues based on this condition: the decoupling of P‐ and S‐waves, the separation of up‐going and down‐going waves and the precise calculation of P‐wave incident angles. Our strategies facilitate high‐precision extraction of P‐SV‐converted wave angle‐domain common‐image gathers using elastic wave reverse‐time migration. In this paper, first, we employ the first‐order velocity‐dilatation‐rotation elastic wave equations to decouple P‐ and S‐waves automatically during source and receiver wavefield extrapolations. Second, we calculate the optical flow vectors of P‐ and S‐waves to ensure stable calculations of wave propagation directions. Based on this, we obtain up‐going and down‐going waves of P‐ and S‐waves. Meanwhile, we calculate the incident angle of the source P‐wave using geometric relations. Lastly, we apply the angle‐domain imaging condition to achieve high‐precision extraction of P‐SV‐converted wave angle‐domain common‐image gathers. Model examples demonstrate the effectiveness and advantages of the proposed method.

© 2024 European Association of Geoscientists & Engineers. © 2024 European Association of Geoscientists & Engineers.
Loading

Article metrics loading...

/content/journals/10.1111/1365-2478.13571
2024-08-23
2025-11-14

  • From This Site

    /content/journals/10.1111/1365-2478.13571
    dcterms_title,dcterms_subject,pub_keyword
    -contentType:Journal -contentType:Contributor -contentType:Concept -contentType:Institution
    10
    5
Loading full text...

Full text loading...

References

  1. Biondi, B. & Symes, W.W. (2004) Angle‐domain common‐image gathers for migration velocity analysis by wavefield‐continuation imaging. Geophysics, 69(5), 1283–1298.
     [Google Scholar]
  2. Chen, T. (2015) Construction and application technology research of elastic wave ADCIG. Master's thesis, Qingdao, China: Ocean University of China.
  3. Dickens, T.A. & Winbow, G.A. (2011) RTM angle gathers using Poynting vectors. In SEG technical program expanded abstracts 2011. Houston, TX: Society of Exploration Geophysicists, pp. 3109–3113.
     [Google Scholar]
  4. Du, Q., Guo, C., Zhao, Q., Gong, X., Wang, C., Li, X.‐Y. (2017) Vector‐based elastic reverse time migration based on scalar imaging condition. Geophysics, 82(2), S111–S127.
     [Google Scholar]
  5. Du, Q., Zhu, Y. & Ba, J. (2012) Polarity reversal correction for elastic reverse time migration. Geophysics, 77(2), S31–S41.
     [Google Scholar]
  6. Du, Q., Zhu, Y., Zhang, M. & Gong, X. (2013) A study on the strategy of low wavenumber noise suppression for prestack reverse‐time depth migration. Chinese Journal of Geophysics (in Chinese), 56(7), 2391–2401. Available from: https://doi.org/10.6038/cjg20130725
     [Google Scholar]
  7. Gong, T., Nguyen, B.D. & Mcmechan, G.A. (2016) Polarized wavefield magnitudes with optical flow for elastic angle‐domain common‐image gathers. Geophysics, 81(4), S239–S251.
     [Google Scholar]
  8. Gray, S.H. (1997) True‐amplitude seismic migration: a comparison of three approaches. Geophysics, 62(3), 929–936.
     [Google Scholar]
  9. Horn, B.K.P. & Schunck, B.G. (1981) Determining optical flow. Artificial Intelligence, 17(1–3), 185–203.
     [Google Scholar]
  10. Hu, X., Hu, Q., Liu, D., Wang, W., Yang, J. & Li, X. (2016) Research on RTM and Kirchhoff migration gathering. CT Theory and Applications, 25(5), 507–514.
     [Google Scholar]
  11. Jin, S., Cambois, G. & Vuillermoz, C. (2000) Shear‐wave velocity and density estimation from PS‐wave AVO analysis: application to an OBS dataset from the North Sea. Geophysics, 65(5), 1446–1454.
     [Google Scholar]
  12. Kong, X., Zhang, R., Li, Z. & Zhu, X. (2017) Research on RTM and Kirchhoff migration. Progress in Geophysics (in Chinese), 32(2), 640–644.
     [Google Scholar]
  13. Li, H., Yang, G., Li, Z., Zhang, K. & Ran, Y. (2017) A method for extracting angle‐domain common‐image gathers based on local plane wave decomposition. Oil Geophysical Prospecting (in Chinese), 52(6), 1177–1183.
     [Google Scholar]
  14. Li, K.‐R. & He, B.‐S. (2020) Extraction of P‐and S‐wave angle‐domain common‐image gathers based on first‐order velocity‐dilatation‐rotation equations. Applied Geophysics, 17(1), 92–102.
     [Google Scholar]
  15. Liu, F., Zhang, G., Morton, S.A. & Leveille, J.P. (2011) An effective imaging condition for reverse‐time migration using wavefield decomposition. Geophysics, 76(1), S29–S39.
     [Google Scholar]
  16. Liu, J.‐C., Xie, X.‐B. & Chen, B. (2017) Reverse‐time migration and amplitude correction in the angle‐domain based on Poynting vector. Applied Geophysics, 14, 505–516.
     [Google Scholar]
  17. Lu, J., Yang, Z., Wang, Y. & Shi, Y. (2015) Joint PP and PS AVA seismic inversion using exact Zoeppritz equations. Geophysics, 80(5), R239–R250.
     [Google Scholar]
  18. Luo, C., Ba, J., Carcione, J.M., Huang, G. & Guo, Q. (2020) Joint PP and PS pre‐stack AVA inversion for VTI medium based on the exact Graebner equation. Journal of Petroleum Science and Engineering, 194, 107416.
     [Google Scholar]
  19. Lv, Q. (2018) Optical flow method for calculation angle gathers in reverse‐time migration imaging. Master's thesis, Wuhan, China: China University of Geosciences.
     [Google Scholar]
  20. Sava, P. & Fomel, S. (2006) Time‐shift imaging condition in seismic migration. Geophysics, 71(6), S209–S217.
     [Google Scholar]
  21. Sava, P.C. & Fomel, S. (2003) Angle‐domain common‐image gathers by wavefield continuation methods. Geophysics, 68(3), 1065–1074.
     [Google Scholar]
  22. Tang, H.‐G., He, B.‐S. & Mou, H.‐B. (2016) P‐and S‐wave energy flux density vectors. Geophysics, 81(6), T357–T368.
     [Google Scholar]
  23. Tang, C. & McMechan, G.A. (2018). Multidirectional‐vector‐based elastic reverse time migration and angle‐domain common‐image gathers with approximate wavefield decomposition of P‐and S‐waves. Geophysics, 83(1), S57–S79.
     [Google Scholar]
  24. Vyas, M., Nichols, D. & Mobley, E. (2011) Efficient RTM angle gathers using source directions. In SEG technical program expanded abstracts. 3104–3108.
     [Google Scholar]
  25. Wang, B., Gao, J., Chen, W. & Zhang, H. (2013) Extracting efficiently angle gathers using Poynting vector during reverse time migration. Chinese Journal of Geophysics (in Chinese), 56(1), 262–268. Available from: https://doi.org/10.6038/cjg20130127
     [Google Scholar]
  26. Wang, B., Zhang, F., Dai, F. & Li, X. (2023) Study on seismic inversion method of SH‐SH wave in VTI media. Chinese Journal of Geophysics (in Chinese), 66(5), 2112–2122.
     [Google Scholar]
  27. Wang, H., He, B. & Shao, X. (2022) Numerical simulation of first‐order velocity‐dilatation‐rotation elastic wave equation with staggered grid. Oil Geophysical Prospecting (in Chinese), 57(6), 1352–1361.
     [Google Scholar]
  28. Wang, P. & He, B. (2017) Vector field dot product cross‐correlation imaging based on 3D elastic wave separation. Oil Geophysical Prospecting (in Chinese), 52(3), 477–483.
     [Google Scholar]
  29. Wang, W. & Mcmechan, G.A. (2015) Vector‐based elastic reverse time migration. Geophysics, 80, S245–S258.
     [Google Scholar]
  30. Wu, C., Wang, H., Feng, B. & Sheng, S. (2021) RTM angle gathers based on the Combining Local and Global (CLG) optical flow method and wavefield decomposition method. Chinese Journal of Geophysics (in Chinese), 64(4), 1375–1388. Available from: https://doi.org/10.6038/cjg2021O0088
     [Google Scholar]
  31. Xie, C., Song, P., Zou, Z., Tan, J., Wang, S. & Zhao, B. (2022) Cross‐correlation weighted reverse time migration with wavefield decomposition based on optical flow vector. Chinese Journal of Geophysics (in Chinese), 65(6), 2260–2275. Available from: https://doi.org/10.6038/cjg2022P0328
     [Google Scholar]
  32. Xie, X.B. & Wu, R.S. (2002) Extracting angle domain information from migrated wavefield. In SEG technical program expanded abstracts 2002. Houston, TX: Society of Exploration Geophysicists, pp. 1360–1363.
     [Google Scholar]
  33. Xu, S., Zhang, Y. & Tang, B. (2011) 3D angle gathers from reverse time migration. Geophysics, 76(2), S77–S92.
     [Google Scholar]
  34. Yan, J. & Sava, P. (2008) Isotropic angle‐domain elastic reverse‐time migration. Geophysics, 73(6), S229–S239.
     [Google Scholar]
  35. Yan, R. & Xie, X.B. (2011) Angle gather extraction for acoustic and isotropic elastic RTM. In SEG technical program expanded abstracts 2011. Houston, TX: Society of Exploration Geophysicists, pp. 3141–3146.
     [Google Scholar]
  36. Yan, R. & Xie, X.‐B. (2012) An angle‐domain imaging condition for elastic reverse time migration and its application to angle gather extraction. Geophysics, 77(5), S105–S115.
     [Google Scholar]
  37. Yoon, K. & Marfurt, K.J. (2006) Reverse‐time migration using the Poynting vector. Exploration Geophysics, 37(1), 102–107.
     [Google Scholar]
  38. Zhang, Q. (2014) RTM angle gathers and specular filter (SF) RTM using optical flow. In SEG technical program expanded abstracts 2014. Houston, TX: Society of Exploration Geophysicists, pp. 3816–3820.
     [Google Scholar]
  39. Zhang, Q. & Mcmechan, G.A. (2011a) Common‐image gathers in the incident phase‐angle domain from reverse time migration in 2D elastic VTI media. Geophysics, 76(6), S197–S206.
     [Google Scholar]
  40. Zhang, Q. & Mcmechan, G.A. (2011b) Direct vector‐field method to obtain angle‐domain common‐image gathers from isotropic acoustic and elastic reverse time migration. Geophysics, 76(5), WB135–WB149.
     [Google Scholar]
  41. Zhang, W. (2018) Elastic reverse time migration and extract angle domain common image gathers. Master's thesis, Daqing, China: Northeast Petroleum University.
/content/journals/10.1111/1365-2478.13571
Loading
A method for extracting P‐SV‐converted wave angle‐domain common‐image gathers based on elastic‐wave reverse‐time migration
Geophysical Prospecting 72, 2469 (2024); https://doi.org/10.1111/1365-2478.13571
/content/journals/10.1111/1365-2478.13571
/content/journals/10.1111/1365-2478.13571
Loading

Data & Media loading...

  • Article Type: Research Article
Keyword(s): data processing; elastics; imaging; multicomponent; wave

Most Cited This Month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error