1887
Volume 22, Issue 2
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

The wave-equation-based multiple suppression method, unlike predictive deconvolution and stacking, makes no assumptions on periodicity or moveout patterns of multiples, and can cope with complex sea-bottom and sea-surface variations. It entails multiple prediction by wave equation extrapolation of the seismic data and then multiple subtraction from the recorded seismograms. In general, the multiple subtraction method requires the calculation of a subtraction scalar (a reflection coefficient function), which is a function of the ratio of the original data to the extrapolated multiple model traces. The success of the method depends on establishing the correct scalar. However, it is difficult to get a good subtraction scalar when the wavelet of the original data is different from that of the multiple model traces. This occurs for the long offset traces because of geophone ghosting, and changes of amplitude and phase in the reflection waveform beyond the critical angle.

In this paper, we develop a superior alternative scheme, based on a simple 2-D Butterworth-type gain function, calculated from the original data and the (extrapolated) multiple model data. This gain function will attenuate the multiples and preserve the primaries. A simple synthetic example is used to demonstrate the efficacy of the method in multiple suppression.

© 1991 ASEG
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1991-06-01
2026-01-14

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References

  1. Alam, A., and Austin, J. (1981). ‘Suppression of multiples using slant stacks’. Presented at the 51st Ann. Internal. Mtg., Soc. Explor. Geophys.
  2. Backus, M. M., (1959). ‘Water reverberations – their nature and elimination’. Geophysics, 24, 233-261.
  3. Bernth, H., and Sonneland, L. (1983). ‘Wavefield extrapolation techniques for prestack attenuation of water reverberations’. 53rd Ann. Interrfat. Mtg., Soc. Explor. Geophys., Expanded Abstracts, 264-265.
  4. Berryhill, J. R., and Kim, Y. C. (1986). ‘Deep-water peg legs and multiples. Emulation and suppression’. Geophysics, 51, 2177-2184.
  5. Calvert, A. J. (1990). ‘Ray-tracing-based prediction and subtraction of water-layer multiples’. Geophysics, 55, 443-451.
  6. Greenhalgh, S. A., Mason, I. M., Lucas, E., Pant, D., and Eames, R. T. (1990). ‘Controlled direction reception filtering of P- and S-waves in r-p space’. Geophys. J. Int., 100, 221-234.
  7. Hampson, D. (1986). ‘Inverse velocity stacking for multiple elimination’. Journal of the Can. Soc. Explor. Geophys., 22, 44-55.
  8. Loewenthal, D., Lu, L., Roberson, R., and Sherwood, J. W. C. (1974). ‘The wave equation applied to migration and water bottom multiples’. Presented at the 36th Mtg., Eur. Assn. Explo. Geophys.
  9. Morley, L. (1982). ‘Predictive techniques for marine multiple suppression’. Ph.D. dissertation, Stanford Univ.
  10. Peacock, K. L., and Treitel, S. (1969). ‘Predictive deconvolution: Theory and practice’. Geophysics, 34, 155-169.
  11. Ryu, J. V. (1982). ‘Decomposition (DECOM) approach applied to wave field analysis with seismic reflection records’. Geophysics, 47, 869-883.
  12. Taner, M. T. (1980). ‘Long period sea-floor multiples and their suppression’. Geophys. Prosp., 28, 30-40.
  13. Treitel, S., Gutowski, P. R., and Wagner, D. E. (1982). ‘Plane-wave decompositon of seismograms’. Geophysics, 47, 1375-1401.
  14. Wiggins, J. W. (1988). ‘Attenuation of complex water-bottom multiples by wave-equation based prediction and subtraction’. Geophysics, 53, 1527-1539.
  15. Yilmaz, O. (1987). Seismic Data Processing, Investigations in Geophysics 2, Society Of Exploration Geopnysicists, Tulsa, OK.
  16. Yilmaz, O. (1989). ‘Velocity-stack processing’. Geophys. Prosp., 37, 357-382.
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  • Article Type: Research Article
Keyword(s): extrapolation; multiples; suppression; wave-equation

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