1887

Abstract

Summary

A characteristic wave decomposition (CWD) method is presented in this paper, which can express the seismic data sparsely. We perform CWD by double beam forming for a compressed seismic wave-field and its index. Based on the beam-formed wave-field in characteristic domain, a beam-based characteristic wave imaging method (CWI) is put forward. Due to the flexibility and efficiency to generate angle gathers for velocity model building, the CWI is a useful alternative to Kirchhoff and wave-equation migrations. Extension of CWI to anisotropic media by introducing ray tracing system in transverse isotropic with a vertical symmetry (VTI) media achieve a better imaging result. The CWI has a theoretical speedup of 1∼2 orders of magnitude over the conventional Kirchhoff migration methods. Besides, it can handle low signal to noise ratio data and target oriented imaging conveniently, and angle gathers can be produced naturally by CWI. Consequently, the CWI is an efficient technique for large scale seismic imaging and 3D velocity model building.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.20140785
2014-06-16
2024-03-28
Loading full text...

Full text loading...

References

  1. AlkhalifahT.
    , 2000, An acoustic wave equation for anisotropic media: Geophysics, 65, 1239∼1250.
    [Google Scholar]
  2. Baysal, E., D. D.Kosloff and J.W.C.Sherwood
    , 1983, Reverse time migration: Geophysics, 48, 1514–1524.
    [Google Scholar]
  3. GaoF et al
    , 2006, Fast beam migration-a step toward interactive imaging: SEG, Expanded Abstracts, 2470–2473.
    [Google Scholar]
  4. Hill, N. R.
    , 1990, Gaussian beam migration: Geophysics, 55, 1416–1428.
    [Google Scholar]
  5. Hale, D.
    , 1992, Migration by the Kirchhoff, Slant Stack and Gaussian beam Methods: CWP Report CWP-126.
    [Google Scholar]
  6. Krüger, F., M.Weber, and F.Scherbaum, et al.
    , 1993, Double beam analysis of anomalies in the core-mantle boundary region. Geophysical Research Letters, 20, 1475–1478.
    [Google Scholar]
  7. Liu, J. and Palacharla, G.
    , 2011, Multiarrival Kirchhoff beam migration Geophysics, 76, 5, WB109–WB118.
    [Google Scholar]
  8. Sun, H. and G. T.Schuster
    , 2001, 2D wavepath migration: Geophysics, 66(5), 1528–1537.
    [Google Scholar]
  9. Stoffa, P. L. et al.
    , 1981, Direct mapping of seismic data to the domain of intercept time and ray parameter –A plane wave decomposition: Geophysics, 46(3), 255–267.
    [Google Scholar]
  10. VanelleC., D.Gajewski
    , 2013, True-amplitude Kirchhoff depth migration in anisotropic media: The traveltime-based approach: Geophysics, 78(5), WC33–WC39.
    [Google Scholar]
  11. Zhu, T., S. H.Gray, and D.Wang
    , 2007, Prestack Gaussian-beam depth migration in anisotropic media: Geophysics, 72(3), S133–S138.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.20140785
Loading
/content/papers/10.3997/2214-4609.20140785
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