Assessment of CO2 Injectivity in Highly Deformable Chalk Reservoirs: a Thermo-Hydro-Mechanical Analysis

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Depleted hydrocarbon chalk reservoirs are attractive candidates for CO2 storage in Denmark. However, their highly deformable nature presents challenges for CO2 injectivity and storage. This study investigates the potential for thermal effects on reservoir and caprock integrity caused by a 16 year-long supercritical cold CO2 injection in a depleted gas reservoir using a thermohydro-mechanical simulation. We focus on quantifying the additional stresses and strains induced by the thermal expansion and contraction of the rocks and examine whether these changes could trigger fracturing/fault reactivation in the chalk and/or the overlaying shale deposits. To address convergence issues in non-isothermal flow modeling, we assume that the density and viscosity of CO2 remain constant with temperature change in the coupled simulation. Our results demonstrate that, with constant rate injection of CO2, temperature propagation is limited to a short distance around the well, and CO2 only cools down the temperature around the injection site. This study provides insights into the feasibility of cold CO2 injection in hot depleted hydrocarbon reservoirs and highlights the importance of considering thermal effects on faults and fractures behavior.
Original languageEnglish
Title of host publicationProceedings of the 57th U.S. Rock Mechanics/Geomechanics Symposium
Number of pages7
PublisherAmerican Rock Mechanics Association (ARMA)
Publication date2023
Article numberARMA-2023-0646
Publication statusPublished - 2023
Event57th U.S. Rock Mechanics/Geomechanics Symposium - Atlanta, United States
Duration: 25 Jun 202328 Jun 2023
Conference number: 57


Conference57th U.S. Rock Mechanics/Geomechanics Symposium
Country/TerritoryUnited States


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