Évaluation de l’impact mécanique d’un stockage de CO2 dans un aquifère du bassin parisien

Abstract : The objective of PICOREF project was to select and characterize geological sites where CO2 storage in permeable reservoir could be tested at pilot scale. INERIS has contributed to that project by evaluating the mechanical impact of CO2 injection (about 150 kt per year) into a deep saline aquifer (Dogger). As the modelling work was achieved before the results of the reservoir-engineering model were available, it was decided to test a full-coupled approach where effective stresses, total strains and pore pressure are resolved in the same set of «hydro-mechanical» equations. The two-dimensional mechanical FLAC2D code, and especially the two-phase fl ow option, was used for these simulations. Due to the 2-D nature of the model, an equivalent flow rate had to be calculated in order to return the same pressure and saturation values as those obtained in 3-D. No chemical interaction between fluid and mineral phases was taken into account in the simulation. The main results are the following, after the 4-years period of injection: 66 MPa and 5,5 MPa are the maximum overpressure values reached in the reservoir, respectively for CO2 and water phase; horizontal and vertical effective stress variations are respectively 2,5 MPa and 6 MPa; the maximum induced vertical displacement reaches 3 cm, at the top of the reservoir ; no rock-mass failure is computed either for the reservoir or for the caprocks during the injection period and after ; the risk of fractures shearing is null, if one assumes that their friction angle is larger than 30°
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Alain Thoraval. Évaluation de l’impact mécanique d’un stockage de CO2 dans un aquifère du bassin parisien. Rapport Scientifique INERIS, 2009, 2008-2009, pp.107-108. ⟨ineris-01869260⟩

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