Insights into seismic inversion for geotechnical property estimation in coal mining

Peter Hatherly; Binzhong Zhou; Milovan Urosevic; Troy Peters

doi:10.1071/ASEG2007ab173

ISSN: 2202-0586
E-ISSN:

oa Insights into seismic inversion for geotechnical property estimation in coal mining
Authors Peter Hatherly^a, Binzhong Zhou^b, Milovan Urosevic^c and Troy Peters^d
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^a School of Geosciences University of Sydney, NSW 2006, phatherly@geosci,usyd.edu.au ^b CSIRO Exploration & Mining, PO Box 883 Kenmore Qld 4069, [email protected] ^c Dept. Exploration Geophysics Curtin University, WA 6102, [email protected] ^d Velseis Processing, PO Box 118 Sumner Park Qld 4074, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2007, Issue ASEG2007 - 19th Geophysical Conference, Dec 2007, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2007ab173
- Published online: 01 Dec 2007

Abstract

Summary

Seismic reflection surveying, especially by the 3D method has an established role in mapping geological structures that might affect the operation of an underground coal mine. Through acoustic inversion, seismic reflection surveys also have the potential to provide geotechnical information on the sedimentary units that host the coal seams. Acoustic impedance can be empirically related to the Geophysical Strata Rating (GSR), a geotechnical measure obtained through the analysis of geophysical logs. GSR values derived from 3D seismic inversion thereby allow comprehensive mapping of geotechnical variability. In this paper we describe our approach using model-based inversion. In the vicinity of the coal seams where there are large contrasts in acoustic impedance, care is required to ensure that impedances are not overestimated and lead to invalid GSR values. We show results from 3D seismic surveys in the Bowen Basin of Central Queensland.

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References

Barton, N., 2006, Rock quality, seismic velocity, attenuation and anisotropy. Taylor & Francis, Leiden, The Netherlands.
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Hatherly, P., Medhurst, T., Sliwa, R., and Turner, R., 2005, A rock mass assessment procedure based on quantitative geophysical log analysis of coal measure sequences, Exploration Geophysics, 36, 112-116.
Hatherly, P., Medhurst, T. and MacGregor, S., 2007, A rock mass rating scheme for clastic sediments based on geophysical logs, International Workshop on Rock Mass Classification in Underground Mining held in conjunction with Canada-USA Symposium on Rock Mechanics, Vancouver.
Molinda G.M. and Mark C., 1994, Coal mine roof rating (CMRR): a practical rock mass classification for coal mines. Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, IC 9387.
Russell, B. and Hampson, D., 1991, Comparison of poststack seismic inversion methods, Meeting, SEG, Expanded Abstracts, 876-878.
Zhou, B., Hatherly, P., Urosevic, M., and Peters, T., 2007, Issues for the inversion of seismic reflection data for geotechnical properties. 7th International Workshop on the Application of Geophysics to Rock Engineering held in association with the 11th Congress of ISRM, Lisbon.

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Article Type: Research Article

Keyword(s): coal; geotechnical; inversion; mining; seismic

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oa Insights into seismic inversion for geotechnical property estimation in coal mining

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