Abstract Summary
CO2 storage should be able to maintain 99% of CO2 for at least a thousand years. A necessary condition for not having leakage is that the caprock has an adequate sealing capacity, ensured only if the threshold capillary pressure of caprock is larger than the capillary pressure due to the CO2 injection. The threshold capillary pressure is experimentally determined through tests in which the non wetting fluid is forced to penetrate into water saturated specimen. This work reports the results of two threshold tests performed on remoulded caprock specimens using CO2 in supercritical condition and air as non-wetting fluid.
