January 2021 - by Alba Zappone, Melchior Grab, Antonio Rinaldi, Quinn Wenning, Anne Obermann, Claudio Madonna, Clément Roques, Ch. Nussbaum, Stefan Wiemer, A. Minardi, Lyesse Laloui
Successful geological sequestration of carbon dioxide (CO2) relies on the sealing capability of low permeability rocks (caprock) overlying permeable rocks (reservoir) where CO2 is stored. Several projects within the Work Package 1 of the SCCER-SoE successfully studied the trapping efficiency of a potential caprock during CO2 injection. Scientists from the Lab of Soil Mechanics at EPFL and from the Rock Physics and Mechanics Lab at ETHZ developed a systematic lab-scale testing procedure to assess the sealing capacity of shale caprock to CO2 injection. The experiments are carried out in the framework of a large European project (ELEGANCY), involving also large scale injection tests in the Mont Terri Underground Research Laboratory. To tackle the potential of induced micro-seismicity related to CO2 sequestration, scientists from EPFL, ETHZ and Swiss Seismological Service (SED), developed numerical models to evaluate the geo-mechanical response of the caprock to prolonged injection of CO2 enriched fluids.