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000824282 1001_ $$0P:(DE-HGF)0$$aKampman, N.$$b0
000824282 245__ $$aObservational evidence confirms modelling of the long-term integrity of CO2-reservoir caprocks
000824282 260__ $$aLondon$$bNature Publishing Group$$c2016
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000824282 520__ $$aStorage 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.
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000824282 7001_ $$00000-0002-3279-5202$$aBusch, A.$$b1
000824282 7001_ $$00000-0003-1770-412X$$aBertier, P.$$b2
000824282 7001_ $$0P:(DE-HGF)0$$aSnippe, J.$$b3
000824282 7001_ $$0P:(DE-HGF)0$$aHangx, S.$$b4
000824282 7001_ $$0P:(DE-Juel1)130893$$aPipich, V.$$b5$$ufzj
000824282 7001_ $$0P:(DE-Juel1)141663$$aDi, Z.$$b6
000824282 7001_ $$0P:(DE-HGF)0$$aRother, G.$$b7
000824282 7001_ $$0P:(DE-HGF)0$$aHarrington, J. F.$$b8
000824282 7001_ $$0P:(DE-HGF)0$$aEvans, J. P.$$b9
000824282 7001_ $$0P:(DE-HGF)0$$aMaskell, A.$$b10
000824282 7001_ $$0P:(DE-HGF)0$$aChapman, H. J.$$b11
000824282 7001_ $$0P:(DE-HGF)0$$aBickle, M. J.$$b12$$eCorresponding author
000824282 773__ $$0PERI:(DE-600)2553671-0$$a10.1038/ncomms12268$$gVol. 7, p. 12268 -$$p12268 -$$tNature Communications$$v7$$x2041-1723$$y2016
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