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

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms12268· OSTI ID:1279389
 [1]; ORCiD logo [2]; ORCiD logo [3];  [2];  [4];  [5];  [5];  [6];  [7];  [8];  [9];  [9];  [9]
  1. Shell Global Solutions International, Rijswijk (Netherlands); Univ. of Cambridge (United Kingdom)
  2. Shell Global Solutions International, Rijswijk (Netherlands)
  3. RWTH Aachen Univ. (Germany)
  4. Univ. of Utrecht (Netherlands)
  5. Julich Research Centre (Germany)
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  7. British Geological Survey, Nottingham (United Kingdom)
  8. Utah State Univ., Logan, UT (United States)
  9. Univ. of Cambridge (United Kingdom)

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. The resulting uncertainty poses a significant challenge to the risk assessment of geological carbon storage. 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. Moreover, 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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Nanoscale Control of Geologic CO2 (NCGC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725; NE/F004699/1; AC02-05CH11231
OSTI ID:
1279389
Journal Information:
Nature Communications, Vol. 7; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 84 works
Citation information provided by
Web of Science

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Cited By (7)

Chemo-mechanical behavior of clay-rich fault gouges affected by CO 2 -brine-rock interactions : Original Research Article: Chemo-mechanical behavior of clay-rich fault gouges journal December 2018
Connecting Pressure-Saturation and Relative Permeability Models to Fracture Properties: The Case of Capillary-Dominated Flow of Supercritical CO 2 and Brine journal September 2018
A general orientation distribution function for clay-rich media journal November 2019
New insights on the complex dynamics of two-phase flow in porous media under intermediate-wet conditions journal July 2017
Pore-scale characteristics of multiphase flow in heterogeneous porous media using the lattice Boltzmann method journal March 2019
Fe-oxide concretions formed by interacting carbonate and acidic waters on Earth and Mars journal December 2018
Determining the porosity of mudrocks using methodological pluralism journal January 2017

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