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MODELING A LONG-TERM CO2 INJECTION EXPERIMENT AT THE UNDERGROUND ROCK LABORATORY OF MONT TERRI

By Víctor Vilarrasa, Dorothee Rebscher and Roman Y. Makhnenko

Abstract

Geologic carbon storage is considered as a key technology to reach zero emissions by 2050 in order to meet the objective of the Paris Agreement of limiting temperature increase below 2 ºC. Yet, a number of concerns exist about the long-term caprock integrity to permanently storing CO2 in deep geological formations. To gain knowledge on the sealing properties of clay-rich geomaterials that serve as caprock, field experiments in underground research laboratories are required. Here, we present preliminary results of the modeling of a long-term CO2 injection experiment into Opalinus Clay (shale) at Mont Terri, Switzerland. Simulation results show that the high entry pressure hinders CO2 penetration in free phase into the shale, but CO2 does get into Opalinus Clay dissolved into the resident pore water. The presence of fractures in the caprock provide preferential paths for pressure propagation and for CO2 migration provided that the CO2 entry pressure is low enough to permit CO2 entering into it. The modeling of the experiment is ongoing in order to define the design of the experiment.VV would like to acknowledge funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement No. 801809).Peer reviewe

Topics: HM coupled analysis, Fluid injection, Geologic Carbon Storage, Geo-energies, Caprock Integrity,, Opalinus clay
Year: 2019
DOI identifier: 10.13039/501100000781
OAI identifier: oai:digital.csic.es:10261/183578
Provided by: Digital.CSIC
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