1887

Abstract

Summary

In Gaussian beam (GB) method, initial beam parameters are the principal factors influencing the accuracy of seismic depth imaging. To overcome the shortcoming of conventional space-time Gaussian beam migration, a new space-time self-adaptive Gaussian beam migration approach is proposed by introducing the optimized dynamic beam parameter to the construction of beam. The beam width of our method at each time step of central space-time ray can be automatically calculated to obtain a more stable beam propagation, which is equal to the wavelength limited by local velocity field. Based on the refactored source wavelet and Kirchhoff integral equation, the direct and backward wave-fields are constructed in 2D acoustic media expressed by space-time self-adaptive Gaussian beam for the implementation of migration. The proposed method resolves the imaging contradictions between the shallow and deep regions caused by constant beam parameter. Numerical experiments conducted demonstrate the accuracy of this new optimal approach.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201800975
2018-06-11
2020-07-05
Loading full text...

Full text loading...

References

  1. Alkhalifah, T.
    , 1995, Gaussian beam depth migration for anisotropic media: Geophysics, 60, 1474–1484.
    [Google Scholar]
  2. Gray, S. H.
    , 2005, Gaussian beam migration of common-shot records: Geophysics, 70(4), S71–S77.
    [Google Scholar]
  3. Gray, S.H. and Bleistein, N.
    , 2009, True-amplitude Gaussian-beam migration: Geophysics, 74(2), S11–S23.
    [Google Scholar]
  4. Hale, D.
    , 1992, Migration by the Kirchhoff, Slant Stack and Gaussian beam Methods: Center for Wave Phenomena, Colorado School of Mines, Research Report CWP-126.
    [Google Scholar]
  5. Hill, N. R.
    , 1990, Gaussian beam migration: Geophysics, 55(11), 1416–1428.
    [Google Scholar]
  6. , 2001, Prestack Gaussian-beam migration: Geophysics, 66(4), 1240–1250.
    [Google Scholar]
  7. Huang, J., Yang, J., Liao, W., Wang, X., and Li, Z.
    , 2015, Common-shot Fresnel beam migration based on wave-field approximation in effective vicinity under complex topographic conditions: Geophysical Prospecting, 264(3), 554–570.
    [Google Scholar]
  8. Katchalov, A. P., and Popov, M. M.
    , 1988, Gaussian beam methods and theoretical seismograms: Geophysical Journal, 93(3), 465–475.
    [Google Scholar]
  9. , 1990, Application of the method of summation of Gaussian beams to the calculation of theoretical seismograms: Journal of Mathematical Sciences, 50(4), 1727–1742.
    [Google Scholar]
  10. Nowack, R. L.
    , 2008, Focused gaussian beams for seismic imaging: SEG Technical Program Expanded Abstracts, 2376–2380.
    [Google Scholar]
  11. , 2011, Dynamically Focused Gaussian Beams for Seismic Imaging: International Journal of Geophysics, Article ID 316581, 8 pages.
    [Google Scholar]
  12. Popov, M. M., Semtchenok, N. M., Popov, P. M. and Verdel, A. R.
    , 2010, Depth migration by the Gaussian beam summation method: Geophysics, 75(2), S81–S93.
    [Google Scholar]
  13. Protasov, M. I., Tcheverda, V. A.
    , 2012, True amplitude elastic Gaussian beam imaging of multicomponent walkaway VSP data: Geophysical Prospecting, 60(6), 1030–1042.
    [Google Scholar]
  14. Yang, J., Huang, J., Wang, X., and Li, Z.
    , 2015a, Prestack depth migration method using the time-space Gaussian beam: SEG Technical Program Expanded Abstracts, 4303–4307.
    [Google Scholar]
  15. , 2015b, An amplitude-preserved adaptive focused beam seismic migration method: Petroleum Science, 12(3), 417–427.
    [Google Scholar]
  16. Zhu, T., Gray, S. H. and Wang, D.
    , 2007, Prestack Gaussian-beam depth migration in anisotropic media, Geophysics, 72(3), S133–S138.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201800975
Loading
/content/papers/10.3997/2214-4609.201800975
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