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Stepping into the same river twice : field evidence for the repeatability of a CO2 injection test

Ennis-King, J. and LaForce, T. and Paterson, L. and Black, J.R. and Vu, H.P. and Haese, R.R. and Serno, S. and Gilfillan, S. and Johnson, G. and Freifeld, B. and Singh, R. (2017) Stepping into the same river twice : field evidence for the repeatability of a CO2 injection test. Energy Procedia, 114. pp. 2760-2771. ISSN 1876-6102

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Abstract

A single well characterisation test was conducted at the CO2CRC Otway storage site in Victoria, Australia, in 2011 and repeated in 2014. The near-well permeability was found to have declined nearly 60% since the 2011 test, while the residual saturation inferred from a variety of techniques was lower in 2014. There was a significant change in water chemistry, suggesting an alteration of near-well reservoir properties. Possible reasons for these changes are explored, and the implications for other field tests are discussed.