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Volume 37 Number 5
  • E-ISSN: 1365-2478

Abstract

ABSTRACT

In order to make 3D prestack depth migration feasible on modern computers it is necessary to use a target‐oriented migration scheme. By limiting the output of the migration to a specific depth interval (target zone), the efficiency of the scheme is improved considerably. The first step in such a target‐oriented approach is redatuming of the shot records at the surface to the upper boundary of the target zone. For this purpose, efficient non‐recursive wavefield extrapolation operators should be generated. We propose a ray tracing method or the Gaussian beam method. With both methods operators can be efficiently generated for any irregular shooting geometry at the surface. As expected, the amplitude behaviour of the Gaussian beam method is better than that of the ray tracing based operators.

The redatuming algorithm is performed per shot record, which makes the data handling very efficient. From the shot records at the surface‘genuine zero‐offset data’are generated at the upper boundary of the target zone. Particularly in situations with a complicated overburden, the quality of target‐oriented zero‐offset data is much better than can be reached with a CMP stacking method at the surface. The target‐oriented zero‐offset data can be used as input to a full 3D zero‐offset depth migration scheme, in order to obtain a depth section of the target zone.

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2006-04-27
2024-04-20

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References

  1. Berkhout, A.J.1984. Seismic Migration, Volume B: Practical Aspects. Elsevier Science Publishing Co.
    [Google Scholar]
  2. Berkhout, A.J.1985. Seismic Migration, Volume A: Theoretical Aspects, 3rd edn. Elsevier Science Publishing Co.
    [Google Scholar]
  3. Berkhout, A.J. and Wapenaar, C.P.A.1989. One‐way versions of the Kirchhoff integral. Geophysics (in press).
     [Google Scholar]
  4. Berryhill, J.R.1984. Wave equation datuming before stack. Geophysics49, 2064–2066.
    [Google Scholar]
  5. Berryhill, J.R.1986. Submarine canyons velocity replacement by wave equation datuming before stack. Geophysics51, 1572–1579.
    [Google Scholar]
  6. Beydoun, W.B. and Keho, T.H.1987. The paraxial ray method. Geophysics52, 1639–1653.
    [Google Scholar]
  7. Blacquiere, G., Debeye, H.W.J., Wapenaar, C.P.A. and Berkhout, A.J.1989. Three‐dimensional table driven migration. Geophysical Prospecting (submitted).
     [Google Scholar]
  8. Cerveny, V., Popov, M.M. and Psencik, I.1982. Computation of wave fields in inhomogeneous media ‐ Gaussian beam approach. Geophysical Journal of the Royal Astronomical Society70, 109–128.
    [Google Scholar]
  9. Cox, H.L.H., Ooms, F.P.J., Wapenaar, C.P.A. and Berkhout, A.J.1988. Verification of macro‐subsurface models using a shot record approach. 58th SEG meeting, Anaheim , Expanded Abstracts, 904–908.
    [Google Scholar]
  10. Dix, C.H.1955. Seismic velocities from surface measurements. Geophysics20, 68–86.
    [Google Scholar]
  11. Holberg, O.1987. Computational aspects of the choice of operator and sampling interval for numerical differentiation in large‐scale simulation of wave phenomena. Geophysical Prospecting35, 629–655.
    [Google Scholar]
  12. Hubral, P.1976. Interval velocities from surface measurements in the three‐dimensional plane layer case. Geophysics41, 233–242.
    [Google Scholar]
  13. Jeannot, J.P.1988. Full prestack versus shot record migration: practical aspects. 58th SEG meeting, Anaheim , Expanded Abstracts, 966–968.
    [Google Scholar]
  14. Jeannot, J.P., Faye, J.P. and Denelle, E.1986. Prestack migration velocities from depth focussing analysis. 56th SEG meeting, Houston , Expanded Abstracts, 438–440.
    [Google Scholar]
  15. Keho, T.H. and Beydoun, W.B.1988. Paraxial ray Kirchhoff migration. Geophysics53, 1540–1546.
    [Google Scholar]
  16. Peels, G.L.1988. True amplitude wavefield extrapolation with applications in seismic shot record redatuming. Ph.D. thesis, Delft University of Technology.
  17. Postma, R.W. and Jeannot, J.P.1988. Prestack depth imaging beneath complex overburden. 58th SEG meeting, Anaheim , Expanded Abstracts, 596–598.
    [Google Scholar]
  18. Schultz, P.S. and Sherwood, J.W.C.1980. Depth migration before stack. Geophysics45, 361–375.
    [Google Scholar]
  19. Triton, 1985. Target oriented 3D migration. Consortium proposal, Delft University of Technology.
    [Google Scholar]
  20. Van der Made, P.M.1988. Determination of macro‐subsurface models by generalized inversion. Ph.D. thesis, Delft University of Technology.
  21. Verschuur, D.J., Herrmann, P., Kinneging, N.A., Wapenaar, C.P.A. and Berkhout, A.J.1988. Elimination of surface‐related multiply reflected and converted waves. 58th SEG meeting, Anaheim , Expanded Abstracts, 1017–1020.
    [Google Scholar]
  22. Wapenaar, C.P.A. and Berkhout, A.I.1987. Full prestack versus shot record migration. 57th SEG meeting, New Orleans , Expanded Abstracts, 761–764.
    [Google Scholar]
  23. Wapenaar, C.P.A., Peels, G.L., Budejicky, V. and Berkhout, A.J.1989. Inverse extrapolation of primary seismic waves. Geophysics (in press).
     [Google Scholar]
  24. Yilmaz, O. and Lucas, D.1986. Prestack layer replacement. Geophysics51, 1355–1369.
    [Google Scholar]
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