Authors: Dewhurst, DN; Siggins, AF; Kuila, U; Clennell, MB; Raven, MD; Nordgard-Bolas, HM


Cite As:
Dewhurst, DN, Siggins, AF, Kuila, U, Clennell, MB, Raven, MD & Nordgard-Bolas, HM 2008, 'Rock Physics, Geomechanics and Rock Properties in Shales — Where are the Links?', in Y Potvin, J Carter, A Dyskin & R Jeffrey (eds), Proceedings of the First Southern Hemisphere International Rock Mechanics Symposium, Australian Centre for Geomechanics, Perth, pp. 461-474.

Download citation as:   ris   bibtex   endnote   text   Zotero


Abstract:
Understanding shale behaviour is of increasing importance to the petroleum industry and also impacts on engineering issues such as landslides and hazardous waste disposal. Few data are currently available regarding geomechanical, petrophysical and dynamic elastic properties of shales that have been properly preserved and tested under controlled pore pressure conditions. The research detailed here involves triaxial testing of shales to determine failure envelopes, with ultrasonic measurements taken during the application of differential stress through to failure. Empirical relationships are then derived between the geomechanical properties and more easily (or regularly) measured physical and petrophysical properties such as porosity, clay content, cation exchange capacity and dielectric properties. The dynamic elastic properties of shales and their anisotropy are shown to be significantly impacted by maximum principal stress orientation with respect to microfabric and microfracture orientation.

References:
Aplin, A.C., Yang, Y. and Hansen, S. (1995) Assessment of β, the compression coefficient of mudstones and its relationship with detailed lithology. Marine and Petroleum Geology, 12, pp. 955–963.
Chang, C., Zoback, M.D. and Khaksar, A. (2006) Empirical relations between rock strength and physical properties in sedimentary rocks. Journal of Petroleum Science and Engineering, 51, pp. 223–237.
Clennell, M.B., Dewhurst, D.N. and Raven, M. (2006) Shale petrophysics: electrical, dielectric and nuclear magnetic resonance studies of shales and clays. Transactions of the 47th SPWLA Annual Logging Symposium, Veracruz, Mexico, paper KK, 13 p.
Dewhurst, D.N., Aplin, A.C. and Sarda, J.P. (1999) Influence of clay fraction on pore-scale properties and hydraulic conductivity of experimentally compacted mudstones, Journal of Geophysical Research, Solid Earth, 104/B12, pp. 29261–29274.
Dewhurst, D.N. and Hennig, A. (2003) Geomechanical properties related to top seal leakage in the Carnarvon Basin, Northwest Shelf, Australia. Petroleum Geoscience, 9, pp. 255–263.
Dewhurst, D.N. and Siggins, A.F. (2006) Impact of fabric, microcracks and stress field on shale anisotropy: Geophysical Journal International, 165, pp. 135–148.
Dewhurst, D.N., Jones, R.M. and Raven, M.D. (2002) Microstructural and petrophysical characterisation of Muderong Shale: Application to top seal risking. Petroleum Geoscience, 8, pp. 371–383.
Duranti, L. and Ewy, R. (2006) Constitutive relationship for elastic anisotropy of shales: High frequency model. Abstract and presentation to FORCE conference on Seismic Imaging in Shales, Stavanger, Norway.
Holt, R.M., Fjær E., Raaen, A.M. and Ringstad, C. (1991) Influence of stress state and stress history on acoustic wave propagation in sedimentary rocks. In: Hovem, J.M., Richardson, M.D., Stoll, R.D. (editors), Shear Waves in Marine Sediments, Kluwer, The Netherlands, pp. 167–174.
Horsrud, P. (2001) Estimating mechanical properties of shale from empirical correlations. SPE Drilling and Completion, 16, pp. 68–73.
Horsrud, P., Sønstebø, E.F. and Bøe, R. (1998) Mechanical and petrophysical properties of North Sea shales. Int. J. Rock Mech. Min. Sci., 35, pp. 1009–1020.
Ingram, G.M. and Urai, J.L. (1999) Top-seal leakage through faults and fractures; the role of mudrock properties. In: Aplin, A.C., Fleet, A.J. and MacQuaker, J.H.S. (editors), Muds and Mudstones: Physical and Fluid Flow Properties, Geological Society, London, Special Publications, Vol. 158, pp. 125–135.
Johnston, D.H. (1987) Physical properties of shales at temperature and pressure. Geophysics, 52, pp. 1391–1401.
Lashkaripour, G.R. and Dusseault, M.B. (1993) A statistical study on shale properties: Relationships among principal shale properties. In: Probabilistic Methods in Geotechnical Engineering, Li, K.S. and Lo, S-C.R. (editors), Balkema, Rotterdam, The Netherlands, pp. 195–200.
Liu, X., Vernik, L. and Nur, A. (1994) Effects of saturating fluids on seismic velocities in shales. SEG Annual Meeting Expanded Abstracts, 64, pp. 1121–1124.
Marsden, J.R., Holt, R.M., Nakken S.J. and Raaen, A.M. (1992) Mechanical and petrophysical characterisation of highly stressed mudstone. In: Hudson, J.R. (editor), Rock Characterisation, proceedings of the ISRM Conference, Europe 92, pp. 51–56.
Nygard, R. and Gutierrez, M. (2002) Undrained shear behaviour of some UK mudrocks explained by petrology. Journal of Canadian Petroleum Technology, 41, pp. 37–46.
Nygard, R., Gutierrez, M., Gautam, R. and Høeg, K. (2004) Compaction behavior of argillaceous sediments as function of diagenesis. Marine and Petroleum Geology, 21, pp. 349–362.
Paterson, M.S. (1978) Experimental Rock Deformation: The Brittle Field. Springer, Berlin, 254 p.
Steiger, R.P. and Leung, P.K. (1988) Quantitative determination of the mechanical properties of mudrocks. SPE 18024.
Thomsen, L. (1986) Weak elastic anisotropy. Geophysics, 51, pp. 1954–1966.
Vernik, L. and Liu, X. (1997) Velocity anisotropy in shales; a petrophysical study. Geophysics, 62, pp. 521–532.




© Copyright 2019, Australian Centre for Geomechanics (ACG), The University of Western Australia. All rights reserved.
Please direct any queries or error reports to repository-acg@uwa.edu.au