1887

Abstract

Summary

Reverse-time migration (RTM) is the state-of-the-art imaging technology for complex structures. The most important plays nowadays in Brazil are in the pre-salt region. The complex overburden above them, with salt bodies, volcanics and/or shallow carbonates, produces illumination variations thus generating amplitude distortions in the migrated image. Least-squares RTM aims at approximating the inverse of the forward modeling operator, and as such it promises to reduce migration artifacts and compensate for illumination variations due to both acquisition geometry and complex overburden. We apply CHF-based LS-RTM to two field datasets in the Santos basin, acquired using narrow-azimuth streamer geometry.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201803063
2018-11-27
2020-07-05
Loading full text...

Full text loading...

References

  1. Baysal, E., Kosloff, D. and Sherwood, J.
    [1983] Reverse-time migration. Geophysics, 48, 1514–1524.
    [Google Scholar]
  2. Fletcher, R. P., Nichols, D., Bloor, R. and Coates, R. T.
    [2016] Least-squares migration – Data domain versus image domain using point spread functions. The Leading Edge, 35, 157–162.
    [Google Scholar]
  3. Gray, S. H.
    [1997] True-amplitude seismic migration: A comparison of three approaches. Geophysics, 62, 929–936.
    [Google Scholar]
  4. Guitton, A.
    [2004] Amplitude and kinematic corrections of migrated images for nonunitary imaging operators. Geophysics, 69, 1017–1024.
    [Google Scholar]
  5. He, K., Sun, J. and Tang, X.
    [2013] Guided image filtering. IEEE Transactions on Pattern Analysis and Machine Intelligence, 35, 1397–1409.
    [Google Scholar]
  6. Khalil, A., Hoeber, H., RobertsG. and Perrone, F.
    [2016] An alternative to least-squares imaging using data-domain matching filters. 86th Annual International Meeting, SEG, Expanded Abstracts, 4188–4192.
    [Google Scholar]
  7. Lecomte, I.
    [2008] Resolution and illumination analyses in PSDM: A ray-based approach. The Leading Edge, 27, 650–663.
    [Google Scholar]
  8. Nemeth, T., Wu, C. and Schuster, G. T.
    [1999] Least-squares migration of incomplete reflection data. Geophysics, 64, 208–221.
    [Google Scholar]
  9. Schuster, G. T.
    [1993] Least-squares crosswell migration. 63rd Annual International Meeting, SEG, Expanded Abstracts, 110–113.
    [Google Scholar]
  10. Wang, P., Gomes, A., Zhang, Z. and Wang, M.
    [2016] Least-squares RTM: Reality and possibilities for subsalt imaging. 86th Annual International Meeting, SEG, Expanded Abstracts, 4204–4209.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201803063
Loading
/content/papers/10.3997/2214-4609.201803063
Loading

Data & Media loading...

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