Detection and understanding of natural CO2 releases in KwaZulu-Natal, South Africa

Johnson, G. and Hicks, N. and Bond, C.E. and Gilfillan, S. M.V. and Jones, D. and Kremer, Y. and Lister, R. and Nkwane, M. and Maupa, T. and Munyangane, P. and Robey, K. and Saunders, I. and Pearce, J. and Shipton, Z. K. and Haszeldine, R. S. (2017) Detection and understanding of natural CO2 releases in KwaZulu-Natal, South Africa. Energy Procedia, 114. pp. 3757-3763. ISSN 1876-6102

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    Abstract

    Natural carbon dioxide (CO2) emanates from a number of sites along a N-S trend that coincides with a mapped fault near the village of Bongwana in KwaZulu-Natal, South Africa. In addition to the natural CO2 seeps a groundwater well drilled on a farm in Bongwana encountered CO2 and now leaks. Thus the Bongwana sites provide excellent analogues for failed CO2 storage under the two primary leakage scenarios; 1) abrupt leakage through injection well failure or leakage up an abandoned well, and 2) gradual leakage, through undetected faults, fractures or wells. Here we present results from preliminary fieldwork undertaken in September 2015.