%0 Journal Article
%A Kampman, N.
%A Busch, A.
%A Bertier, P.
%A Snippe, J.
%A Hangx, S.
%A Pipich, V.
%A Di, Z.
%A Rother, G.
%A Harrington, J. F.
%A Evans, J. P.
%A Maskell, A.
%A Chapman, H. J.
%A Bickle, M. J.
%T Observational evidence confirms modelling of the long-term integrity of CO2-reservoir caprocks
%J Nature Communications
%V 7
%@ 2041-1723
%C London
%I Nature Publishing Group
%M FZJ-2016-06901
%P 12268 -
%D 2016
%X Storage of anthropogenic CO2 in geological formations relies on a caprock as the primary seal preventing buoyant super-critical CO2 escaping. Although natural CO2 reservoirs demonstrate that CO2 may be stored safely for millions of years, uncertainty remains in predicting how caprocks will react with CO2-bearing brines. This uncertainty poses a significant challenge to the risk assessment of geological carbon storage. Here we describe mineral reaction fronts in a CO2 reservoir-caprock system exposed to CO2 over a timescale comparable with that needed for geological carbon storage. The propagation of the reaction front is retarded by redox-sensitive mineral dissolution reactions and carbonate precipitation, which reduces its penetration into the caprock to ∼7 cm in ∼105 years. This distance is an order-of-magnitude smaller than previous predictions. The results attest to the significance of transport-limited reactions to the long-term integrity of sealing behaviour in caprocks exposed to CO2.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000380536100001
%$ pmid:27464840
%R 10.1038/ncomms12268
%U https://juser.fz-juelich.de/record/824282