This title appears in the Scientific Report :
2016
Please use the identifier:
http://hdl.handle.net/2128/13475 in citations.
Please use the identifier: http://dx.doi.org/10.1038/ncomms12268 in citations.
Observational evidence confirms modelling of the long-term integrity of CO2-reservoir caprocks
Observational evidence confirms modelling of the long-term integrity of CO2-reservoir caprocks
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 wit...
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Personal Name(s): | Kampman, N. |
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Busch, A. / Bertier, P. / Snippe, J. / Hangx, S. / Pipich, V. / Di, Z. / Rother, G. / Harrington, J. F. / Evans, J. P. / Maskell, A. / Chapman, H. J. / Bickle, M. J. (Corresponding author) | |
Contributing Institute: |
Neutronenstreuung; ICS-1 Neutronenstreuung; JCNS-1 JCNS-FRM-II; JCNS-FRM-II |
Published in: | Nature Communications, 7 (2016) S. 12268 - |
Imprint: |
London
Nature Publishing Group
2016
|
DOI: |
10.1038/ncomms12268 |
PubMed ID: |
27464840 |
Document Type: |
Journal Article |
Research Program: |
Jülich Centre for Neutron Research (JCNS) FRM II / MLZ |
Subject (ZB): |
Geosciences
> 0
|
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1038/ncomms12268 in citations.
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. |