Tube Wave Suppression in High Frequency Mine Seismic Data by Singular Value Decomposition

Geraldine Teakle; Shunhua Coa; Stewart Greenhalgh

doi:10.1071/EG995512

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

Tube Wave Suppression in High Frequency Mine Seismic Data by Singular Value Decomposition
Authors Geraldine Teakle^a, Shunhua Coa^b and Stewart Greenhalgh^b
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^a Normandy Mining Ltd, PO Box 751 Kent Town, , SA, 5071, Australia, Ph:(08) 464 2242, Fax:(08) 464 2299 ^b School of Earth SciencesFlinders University, GPO Box 2100 Adelaide, , SA, 5001, Australia
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 26, Issue 2-3, Jun 1995, p. 512 - 517
DOI: https://doi.org/10.1071/EG995512
- Published online: 01 Jun 1995

Abstract

Crosswell and VSP seismic survey data are frequently contaminated by coherent noise trains in the form of direct tube waves and tube-wave-to-body-wave conversions. The problem was especially acute in a recent high resolution underground seismic experiment that was conducted in a hard rock environment. Conventional processing, such as f-k filtering, was ineffective in suppressing such noise events.

A procedure, based on singular value decomposition (SVD) of a seismic section, was employed for cancelling coherent tube-wave related noise. An eigen-analysis splits the section into linearly independent eigenimages. Each eigenimage is a characteristic content of the seismic record. Its energy contribution to the total energy of the seismic section is represented by the magnitude of its corresponding eigenvalue. The leading eigenimages, obtained after windowing and flattening, represent high amplitude and correctable energies such as tube wave noise. The trailing eigenimages represent low amplitude and least correctable energy such as random background noise. Useful records can be extracted by subtracting those eigenimages dominated by the noise from the total seismic gather.

The optimal removal of the tube waves requires the amplitude balancing of traces and the precise alignment of the tube wave event across the traces before eigen-analysis. The procedure is illustrated through application to reversed VSP data acquired in a metalliferous mine. Superior results are obtained in comparison to that of a conventional f-k filter.

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References

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Article Type: Research Article

Keyword(s): coherent noise suppression; eigenimages; eigenvalues; SVD; ube waves; VSP

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Tube Wave Suppression in High Frequency Mine Seismic Data by Singular Value Decomposition

Abstract

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