Effects of physical sorption and chemical reactions of CO2 in shaly caprocks

Andreas Busch*, Sascha Alles, Bernhard M. Krooss, Helge Stanjek, David Dewhurst

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)


A comprehensive experimental approach has been used to assess the interrelation of CO2-mediated chemical reactions and transport properties in pelitic rocks. Sorption values on shale samples (P<20 MPa, 50 {ring operator}C) were high with maximum amounts of ∼44 kg/t. These capacities did not correlate with the organic carbon content, indicating sorption on and/or reaction with mineral components. Further, crushed shale samples were exposed to CO2 in the presence of water at 15 MPa and 50 {ring operator}C for different time periods, showing significant changes in mineral composition. Reaction equilibrium was reached within periods of less than a month. Some of the caprock lithotypes could represent a significant sink for CO2 deposited in the subsurface and could reduce the risk of leakage to the surface.

Original languageEnglish
Pages (from-to)3229-3235
Number of pages7
JournalEnergy Procedia
Issue number1
Publication statusPublished - Feb 2009


  • Caprock integrity
  • Clay minerals
  • CO diffusion
  • CO sorption
  • Mineral reaction
  • Muderong Shale

ASJC Scopus subject areas

  • General Energy


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