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Geochemical Model of CO2 impact at the Well-Caprock-Reservoir interfaces.

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Résumé

The long-term safety of a CO2 geological storage relies on the stability of the reservoir and on a proper assessment of CO2 leakage and fluids displacement. Particular attention must be addressed to the injection wellbore as a human-made discontinuity of the geological medium, especially the caprock. Thus, the chemical and mechanical integrity of the Well-Reservoir-Caprock cement sealing must be insured for the whole lifetime of a CCS project. These aspects are investigated following a 2-step approach within the Project INTERFACE (supported by French Research National Agency ANR through the Captage et stockage du CO2 program). First, a geochemical model of the interface is developed that predicts the mechanisms of cement chemical alteration due to the interaction with the acid brine. Then, geomechanical simulations are run based on main results such as phase changes and cement porosity evolution. Herein, the focus is on geochemical aspects solely.
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Dates et versions

hal-00630967 , version 1 (11-10-2011)

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  • HAL Id : hal-00630967 , version 1

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Frédéric Wertz, Philippe Blanc, Antonin Fabbri, Fabrizio Gherardi. Geochemical Model of CO2 impact at the Well-Caprock-Reservoir interfaces.. EGU General Assembly 2011, Apr 2011, Vienna, Austria. ⟨hal-00630967⟩

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