Unexpected swelling effects of CO2 on clays: Good or bad news for CO2 storage integrity and leak mitigation options?

Unexpected swelling effects of CO2 on clays: Good or bad news for CO2 storage integrity and leak mi

Publieke samenvatting / Public summary

The results obtained in CATO-2 showed that CO2 causes swelling of certain kinds of clays (smectitic clays) in amounts similar to the swelling effects observed in coal. This project will demonstrate whether or not these effects will render fractures in clay-rich caprocks and fault zones self-sealing to CO2 - as is seen when CO2 is injected into coal seams - and whether smectitic clay slurries have the potential for CO2 leak mitigation.