Effective stress and the elastic response of reservoir sandstones and shales

Anthony F. Siggins; David N. Dewhurst; Kevin J. Dodds

doi:10.1071/ASEG2004ab130

ISSN: 2202-0586
E-ISSN:

oa Effective stress and the elastic response of reservoir sandstones and shales
Authors Anthony F. Siggins^a, David N. Dewhurst^b and Kevin J. Dodds^c
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^a CSIRO Petroleum,, Australia, [email protected] ^b CSIRO Petroleum,, Australia, [email protected] ^c CSIRO Petroleum,, Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2004, Issue ASEG2004 - 17th Geophysical Conference, Dec 2004, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2004ab130
- Published online: 01 Dec 2004

Abstract

Effective stress is a key concept in determining reservoir pore pressures from seismic velocity data. It is usually defined as the difference, ΔP between confining (overburden) pressure, Pc and pore pressure, Pp. However , a more general definition is σ´r = PC - nPp where n is an effective stress coefficient. Seismic velocity is observed both in the field and in laboratory experiments to vary non-linearly with effective stress. Furthermore, a form of hysteresis in velocity is observed when reservoir rocks are subjected to differing pore pressure histories. The resulting hysteresis can be quantified with the effective stress coefficient. This coefficient is frequently derived from laboratory velocity-effective stress data at ultrasonic frequencies. This paper describes some recent laboratory based, rock physics experiments involving pore pressure history induced velocity hysteresis and the implications for reservoir 4D monitoring.

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2004-12-01

2026-01-23

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References

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Eberhardt-Phillips, D., Han D-PL, and Zoback, M. D., 1989 . Empirical relationships among seismic velocity, effective pressure , porosity and clay content in sandstone: Geophysics, 54,1,82-89.
Prasad, M. and Manghnani, M. PL, 1997. Effects of pore and differential pressure on compressional wave velocity and quality factor in Berea and Michigan sandstones: Geophysics, 62,4,1163-1176.
Shapiro S.A., 2003. Elastic piezosensitivity of porous and fractured rock.: Geophysics 68,2, 482-486.
Siggins A.F., Dewhurst, D.N. & Tingate, P.R., 2001, Stress path, pore pressure and micro structural influences on Q in Carnarvon Basin Sandstones. Proceedings of the Offshore Technology Conference, 1, 935-944.
Siggins, A.F. and Dewhurst, D.N., 2003, Saturation, pore pressure and effective stress from sandstone acoustic properties, Geophysical Research Letters, Vol. 30, No. 2, 1089.
Todd, T. and Simmons, G., 1972. Effect of pore pressure on the velocity of compressional waves in low-porosity rocks: Journal of Geophysical Research, 77, 20, 3731-3743.

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Article Type: Research Article

Keyword(s): effective stress; pore pressure; Seismic velocity

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oa Effective stress and the elastic response of reservoir sandstones and shales

Abstract

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