The Permian Deep Coal Play, Cooper Basin, Australia. Unlocking the Next Gas Giant
- Gareth Cooper (Senex Energy Ltd) | Duncan Lockhart (Senex Energy Ltd) | Ainslie Walsh (Senex Energy Ltd)
- Document ID
- Society of Petroleum Engineers
- SPE Asia Pacific Oil and Gas Conference and Exhibition, 23-25 October, Brisbane, Australia
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Petroleum Engineers
- Cooper Basin, Stress, Gas, Deep Coal, Fracture stimulation
- 2 in the last 30 days
- 127 since 2007
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Unconventional gas exploration in the Cooper Basin, Australia, has historically concentrated on fracture stimulation of tight gas sandstones within mapped structural closures. In drilling these sandstones, and other clastic reservoir targets, it has been recognised for many years that the Permian coal measures of the Toolachee, Epsilon and Patchawarra Formations record high levels of gas, often in excess of 4000 units, encountered at depths between 2500 and 3500m. Unlike shallower Coal-Seam-Gas reservoirs, which rely on de-pressuristion through de-watering to liberate adsorbed gas from the kerogen surface, deep coals are a "dry" system in which the free gas component is produced via kerogen and fracture permeability.
However maintaining a consistent and commercial flow rate from deep coals alone remained enigmatic until the first dedicated fracture stimulation program of deep Permian coals was commenced in the Moomba Field in 2007. Understandings of Permian source-rock reservoirs, the roles of the coal type and rank on sorption capacity and porosity, the influence of effective pressure and depth on coal permeability and the interrelation of coal fracture permeability with in-situ stress and mechanical stratigraphy has now advanced.
The deep Permian coal fairway in the Patchawarra and Nappamerri Trough of the Cooper Basin has been defined and mapped using a generative potential approach within a comprehensive 3D basin model. Net coal thicknesses from log electro-facies for 879 wells has been combined with available well maturity, TOC, HI and kerogen kinetic data, and calibrated against corrected temperatures in a basin-wide Trinity retention model which incorporates 14 mapped regional horizons. Play fairways have been overlain with observations of in-situ stress direction and fracture orientations from 3D seismic curvature volumes, FMI data and stress states from Mechanical Earth Models (MEM).
Within the basin, this approach has defined a P50 in-place resource of 14.6 TCF of gas and a P10 of 20.7 TCF of gas within the deep coals of the Permian Toolachee, Epsilon and Patchawarra Formations in Senex permits, of which 8-11 TCF is within the North Patchawarra Trough. MEM's have also demonstrated that deep coal seams are consistently in a normal stress state and therefore provide excellent scope for both propagating and constraining vertical fracture growth. Work is now underway to define further those areas, within the mapped resource parameters, which provide the best opportunity to site pilot lateral wells for multi-stage fracture stimulation within deep coals.
|File Size||2 MB||Number of Pages||19|
Apak, S.N., Stuart, W.J. and Lemon, N.M., 1993. Structural-stratigraphic development of the Gidgealpa-Merrimelia-Innamincka Trend with implications for petroleum trap styles, Cooper Basin, Australia. APEA Journal, 33, 1, pp. 94–104. https://doi.org/10.1071/AJ92008.
Abul Khair, H., Cooke, D. and Hand, M. 2013. Natural fracture networks enhancing unconventional reservoirs producibility: mapping and predicting. AAPG Search and Discovery Article 41182. Extended abstract presentation at AAPG Annual Convention and Exhibition, Pittsburgh, Pennsylvania, May 19-22, 2013, p. 20.
Bing, H., Chen, M., Zheng, W., Jianbo, Y. and Ming, L. 2013. Hydraulic fracture initiation theory for a horizontal well in a coal seam. Petroleum Science, 10, pp. 219–225. DOI:10.1007/s12182-013-0270-9
Bjorkum, P.A. and Nadeau, P.H. 1998. Temperature controlled porosity/permeability reduction, fluid migration, and petroeleum exploration in sedimentray basins. APPEA Journal, 38, 1, pp. 453–464. https://doi.org/10.1071/AJ97022
Cooper, G., Xaing, X., Agnew, N., Ward, P., Fabian, M. and Tupper, N., 2015. A systematic approach to unconventional play analysis: the oil and gas potential of the Kockatea Shale and Carynginia Formation, North Perth basin, Western Australia. APPEA Journeal, 55, 1, pp. 193–214. https://doi.org/10.1071/AJ14015
DSD, 2017. South Australian Department of State Development Cooper Basin Fact Sheet. http://petroleum.statedevelopment.sa.gov.au/prospectivity/cooper_basin
Haines, P.W., Hand, M. and Sandiford, M. 2001. Palaeozoic synorogenic sedimentation in central and northern Australia: a review of distribution and timing with implications for the evolution of intracontinental orogens. Australian Journal of Earth Sciences, 48, pp. 911–928. https://doi.org/10.1046/j.1440-0952.2001.00909.x
Hall, L.S., Palu, T. J., Boreham, C., Edwards, D., Hill, A. J., Troup, A. & Lawson, C. 2016. Cooper Basin Petroleum Systems Modelling: Regional Hydrocarbon Prospectivity of the Cooper Basin, Data Pack 3. Geoscience Australia, Canberra. http://www.ga.gov.au/metadata-gateway/metadata/record/90684
Johnson, R.L.,JR., Abul Khair, H.F., Jeffrey, R.G., Meyer J.J., Stark, C. and Tauchintz, J. 2015. Improving fracture initiation and potential impact on fracture coverage by implementing optimal well planning and drilling methods for typical stress conditions in the Cooper Basin, Central Australia. APPEA Journal and Conference Proceedings, 55, extended abstract.
Kinnon, E.C.P., Golding, S.D., Boreham, C.J., Baublys, K.A., and Esterle, J.S. 2009. Stable isotope and water quality analysis of coal bed methane production waters and gases from the Bowen Basin, Australia. International Journal of Coal Geology, 82, 3-4, pp. 219–231. https://doi.org/10.1016/j.coal.2009.10.014
Kumar, H., Lester, E., Kingman, S., Bourne, R., Avila, C., Jones, A., Robinson, J., Halleck, P.M. and Matthews, J.P. 2011. Inducing fractures and increasing cleat aperatures in a bituminous coal under isotropic stress via application of microwave energy. International Journal of Coal Geology, 88, 1, pp. 75–82. https://doi.org/10.1016/j.coal.2011.07.007
Laubach, S.E., Marrett, R.A., Olson, J.E. and Scott, A.R., 1998. Characteristics and origins of coal cleat: A review. International Journal of Coal Geology, 35, pp. 175–207. https://doi.org/10.1016/S0166-5162(97)00012-8
Larson, R.L. and Kincaid, C., 1996. Onset of mid-Cretaceous volcanism by elevation of the 670 km thermal boundary layer. Geology, 24, 6, pp. 551–554. https://doi.org/10.1130/0091-7613(1996)024<0551:OOMCVB>2.3.CO;2
Law, B.E. 2002. Basin-centred gas systems. AAPG Bulletin, 86, 11, pp. 1891–1919. https://doi.org/10.1306/61EEDDB4-173E-11D7-8645000102C1865D
Loukes, R.G., Reed, R.M., Ruppel, S.C., and Jarvie, D.M. 2009. Morphology, genesis, and distribution of nanometer-scale pores in siliceous mudstones of the Mississippian Barnett Shale. Journal of Sedimentary Research, 79, 12, pp. 848–61. https://doi.org/10.2110/jsr.2009.092
Nelson, E.J., Chipperfield, S.T., Hillis, R.R., Gilbert, J., McGowenc, J. and Mildrend, S.D. 2007. The relationship between closure pressures from fluid injection tests and the minimum principal stress in strong rocks. International Journal of Rock Mechanics and Mining Sciences, 44, 5, pp. 787–801. https://doi.org/10.1016/j.ijrmms.2006.10.004
Pepper, A.S. and Corvi, P.J. 1995. Simple kinetic models of petroleum formation. Part III: Modelling in an open system. Marine and Petroleum Geology, 12, 4, pp. 417–52. https://doi.org/10.1016/0264-8172(95)96904-5
Pokalai, K., Kulikowski, D., Johnson, R.L.Jr., Haghighi, M. and Cooke, D. 2016. Development of a new approach for hydraulic fracturing in tight sand with pre-existing natural fractures. 2016. APPEA Journal., pp. 225–238. doi: 10.13140/RG.2.1.1120.9202.
Reynolds, S.D., Mildren, S.D., Hillis, R.R., Meyer, J.J. and Flottmann, T. 2005. Maximum horizontal stress orientations in the Cooper Basin, Australia: implications for plate-scale tectonics amd local stress sources. 2005. Geophysical Journal International, 60, 1, pp. 331–343, https://doi.org/10.1111/j.1365-246X.2004.02461.x
Reynolds, S.D., Mildren, S.D., Hillis, R.R. and Meyer J.J. 2006. Constraining stress magnitudes using petroleum exploration data in the Cooper-Eromanga Basins, Australia. Tectonophysics, 415, 1-4, pp. 123–140. https://doi.org/10.1016/j.tecto.2005.12.005
Roberts, A. 2001. Curvature attributes and their application to 3D interpreted horizons. First Break, 19, 2, pp. 85–100. https://doi.org/10.1046/j.0263-5046.2001.00142.x
Tonnsen, R.R and Miskimins, J.L. 2010. A conventional look at an unconventional reservoir: coalbed methane production potential in deep environments. AAPG Search and Discovery Article 80122. Adapted from poster presentation at AAPG Annual Convention and Exhibition, New Orleans, Louisiana, April 11-14, 2010.
Tyiasning, S. and Cooke, D. 2016. Anisotropy signatures in the Cooper Basin of Australia: Stress versus fractures. Interpretation SEG4: SE51-SE61. 10.1190/INT-2015-0131.1
Zoback, M.D., Barton, C.A., Brudy, M., Castillo, D.A., Finkbeiner, T., Grollimund, B.R., Moos, D.B., Peska, P., Ward, C.D. and Wiprut, D.J. 2003. Determination of stress orientation and magnitude in deep wells. International Journal of Rock Mechanics and Mining Sciences, 40, 7-8, pp. 1049–1076. https://doi.org/10.1016/j.ijrmms.2003.07.001
Zoback, M.D. 2007. Reservoir geomechanics. Cambridge University Press. pp. 449. https://doi.org/10.1017/CBO9780511586477