Application of the tri-axial drill-bit VSP method to drilling for geological survey in civil engineering

Nobukazu Soma; Manabu Utagawa; Masahiro Seto; Hiroshi Asanuma

doi:10.1071/EG04070

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

Application of the tri-axial drill-bit VSP method to drilling for geological survey in civil engineering
Authors Nobukazu Soma, Manabu Utagawa, Masahiro Seto and Hiroshi Asanuma
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 35, Issue 1, Mar 2004, p. 70 - 79
DOI: https://doi.org/10.1071/EG04070
- Received: 04 Jul 2003
- Accepted: 25 Sep 2003
- Published online: 01 Mar 2004

Abstract

We have examined the applicability of the triaxial drill-bit VSP method (TAD-VSP) to the geological survey of possible sites for a high-level radioactive waste disposal repository. The seismic energy generated by a drill bit is measured by a downhole multi-component detector, and the resulting signals are processed to image the geological structure deep underground. In order to apply the TAD-VSP method to civil-engineering-scale drilling, we have developed a small but highly sensitive and precise three-component downhole seismic measurement system, and recorded drill-bit signals at a granite quarry. We have successfully imaged discontinuities in the granite, possibly related to fractures, as highly reflective zones. The discontinuities imaged by the TAD-VSP method correlate well with the results of other borehole observations. In conclusion, the TAD-VSP method is usable in geological investigations for civil engineering because the equipment is compact and it is simple to acquire the drill-bit signal.

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References

Asanuma, H., Liu, H., Niitsuma, H., and Baria, R., 2000, Discrimination of polarization of reflected waves in the triaxial drill-bit VSP and imaging of subsurface structure at Soultz, France: Calgary, Canada: 70th Ann. Internal. Mtg., Soc. Explor. Geophys., Expanded Abstracts.
Asanuma, H., and Niitsuma, H., 1995, Triaxial seismic measurement while drilling and estimation of subsurface structure: Geothermal Science and Technology, 5, 31–51.
Asanuma, H., Niitsuma, H., and Chubachi, N., 1990, An Analysis of Three Dimensional AE Lissajou Pattern during Well-drilling and Estimation of Source Direction: in Yamaguchi, K., Takahashi, H. and Niitsuma, H., (Eds.), Progress in Acoustic Emission V: The Japanese Society for Non-Destructive Inspection, 436–443.
Cho, A., 2001, Report of in-situ rock stress measurement by the hydraulic fracturing method: Internal document of National Institute of Advanced Industrial Science and Technology.
Knapp, C.H., and Carter, G.C, 1976, The Generalized Correlation Method for Estimation of Time Delay: IEEE Trans. Acoustics Speech, Signal Processing, 24, 320–327.
Rector III, J.W., and Marion, B.P., 1991, The use of Drill-Bit Energy as a Downhole Seismic Source: Geophysics, 56, 628–634.

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Article Type: Research Article

Keyword(s): downhole measurement; engineering geology; reflection; seismic-while-drilling

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Application of the tri-axial drill-bit VSP method to drilling for geological survey in civil engineering

Abstract

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