Separation of P Waves and S Waves in the VSP Wavefield on the Basis of a Forward Modelling Technique

H. Amano

doi:10.1071/EG991001

ISSN: 0812-3985
E-ISSN: 1834-7533

Separation of P Waves and S Waves in the VSP Wavefield on the Basis of a Forward Modelling Technique
Authors H. Amano^a
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^a JAPEX Geoscience Institute Inc, . Akasaka Twin Tower East Wing 2-17-22, Akasaka, Minato-ku, Tokyo 107, Japan
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 22, Issue 1, Mar 1991, p. 1 - 4
DOI: https://doi.org/10.1071/EG991001
- Published online: 01 Mar 1991

Abstract

Separation of P waves and S waves in the VSP wavefield is proposed on the basis of a synthetic forward modelling technique. The weak wavefield masked by dominant wave trains can be extracted with this method. The decomposed wavefield is expressed in frequency-depth (f-z) domain as a linear combination of up to third order differential of traces, which is approximated by trace differences in the practical separation process. In general, five traces with single-component data are required in this process, but the same process is implemented with only three traces in the acoustic case. Two-trace extrapolation is applied to each edge of data gather in order to enhance the accuracy of trace difference. Since the formula is developed in f-z domain, the influence of anelasticity is taken into account with simplicity and the calculation is fast enough with the benefit of the fast Fourier transform (FFT).

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1991-03-01

2026-01-13

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References

Benhama, A., Cliet, C, and Dubesset, M., (1988). ‘Study and applications of spatial directional filterings in three-component recordings.’ Geophys. Prosp. 36, 591-613.
Devaney, A. J., and Oristaglio, M. L, (1986). ‘A plane-wave decomposition for elastic wave fields applied to the separation of P-waves and S-waves in vector seismic data.’ Geophysics 51, 419-423.
Hardage, B., (1985). Vertical seismic profiling, Part A. Geophysical Press.
Leaney, W. S., and Esmersoy, C, (1989). ‘Parametric decomposition of offset VSP wave fields.’ In: 59th Ann. internal, Mtg, Soc. Expl. Geophys., Expanded Abstracts, 26-28.
Seeman, B., and Horowicz, L, (1983). ‘Vertical seismic profiling: separation of upgoing and downgoing acoustic waves in a stratified medium'. Geophysics, 48, 555-568.
Temme, P., and Muller, G., (1982). ‘Numerical simulation of vertical seismic profiling.’ J. Geophysics 50, 177-188.

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Article Type: Research Article

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Separation of P Waves and S Waves in the VSP Wavefield on the Basis of a Forward Modelling Technique

Abstract

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