TY  - JOUR
AU  - Kampman, N.
AU  - Busch, A.
AU  - Bertier, P.
AU  - Snippe, J.
AU  - Hangx, S.
AU  - Pipich, V.
AU  - Di, Z.
AU  - Rother, G.
AU  - Harrington, J. F.
AU  - Evans, J. P.
AU  - Maskell, A.
AU  - Chapman, H. J.
AU  - Bickle, M. J.
TI  - Observational evidence confirms modelling of the long-term integrity of CO2-reservoir caprocks
JO  - Nature Communications
VL  - 7
SN  - 2041-1723
CY  - London
PB  - Nature Publishing Group
M1  - FZJ-2016-06901
SP  - 12268 -
PY  - 2016
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000380536100001
C6  - pmid:27464840
DO  - DOI:10.1038/ncomms12268
UR  - https://juser.fz-juelich.de/record/824282
ER  -