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Articles | Volume 17, issue 3
Articles | Volume 17, issue 3
https://doi.org/10.5194/se-17-407-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-17-407-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 17, issue 3
Research article
 | Highlight paper
 | 
05 Mar 2026
Research article | Highlight paper |  | 05 Mar 2026

Feldspar alteration by disequilibrium CO2-H2O fluids in reservoir sandstones: implications for CCS

Natalie J. C. Farrell, Lining Yang, Michael J. Flowerdew, Chris Mark, Buhari Ardo, Kevin G. Taylor, Nico Bigaroni, Michael Pointon, Lewis Hughes, John Waters, and Lee Paul

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Editorial statement
This manuscript explores an important aspect of CCS, the potential interaction with and consequences of CO2-saturated solution with the host rock. In a series of well-executed experiments it is shown that the effects are, at elevated temperatures, especially severe in feldspars, with potentially significant geomechanical and geochemical implications.
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Short summary
Contrary to current CCS (Carbon Capture and Storage) models, reaction experiments conducted at subsurface stress and temperature conditions reveal that feldspars, common, reactive grains in sandstone reservoirs, can undergo significant chemical and mechanical changes when exposed to CO₂ enriched water. These chemo-mechanical processes, including grain fracturing, dissolution, and clay precipitation, can modify fluid pathways and rock strength, potentially reducing reservoir productivity and increasing leakage risk.
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