4.8 Article

Observational evidence confirms modelling of the long-term integrity of CO2-reservoir caprocks

Journal

NATURE COMMUNICATIONS
Volume 7, Issue -, Pages -

Publisher

NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms12268

Keywords

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Funding

  1. NERC [NE/F004699/1]
  2. Shell Global Solutions, Center for Nanoscale Controls on Geologic CO2 (NCGC), an Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [DE-AC02-05CH11231]
  3. DECC
  4. NERC [NE/F004699/1, bgs05010] Funding Source: UKRI
  5. Natural Environment Research Council [NE/F004699/1, bgs05010] Funding Source: researchfish

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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 similar to 7cm in similar to 10(5) 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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