Reactive transport modelling of dissolved CO2 injection in a geothermal doublet. Application to the CO2 -DISSOLVED concept

Christelle Castillo (1) , Nicolas C.M. Marty (1) , Virginie Hamm (1) , Christophe Kervévan (1) , Dominique Thiéry (1) , Louis de Lary de Latour (1) , Jean-Charles Manceau (1)

1 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)

This research was conducted in the framework of the CO2-DISSOLVED project (Kervévan et al., 2014) funded by the ANR (French National Research Agency). This project aims at assessing the feasibility of a novel CO2 injection strategy in deep saline aquifers, combining injection of dissolved CO2 (rather than supercritical CO2) and recovery of the geothermal heat from the extracted brine. This approach relies on the geothermal doublet technology, where the warm water is extracted at a production well and re-injected as cooled water, after heat extraction, in the same aquifer via a second well (injection well). The objective of the work presented here was to identify and to quantify the thermo-hydro-geochemical processes induced by a massive injection of dissolved CO2 into (1) a carbonated aquifer (Dogger of the Paris basin-1,500 to 2,000 m deep-70°C) and (2) a clastic reservoir (Triassic sandstones of the Paris basin-2,000 to 2,500 m deep-90°C), and to evaluate their possible consequences on the feasibility of the CO2-DISSOLVED concept.

Domains: Sciences of the Universe [physics]; Earth Sciences; Geochemistry

Christelle Castillo, Nicolas C.M. Marty, Virginie Hamm, Christophe Kervévan, Dominique Thiéry, et al.. Reactive transport modelling of dissolved CO2 injection in a geothermal doublet. Application to the CO2 -DISSOLVED concept. 13th Conference on Greenhouse Gas Control Technologies (GHGT-13), Nov 2016, Lausanne, Switzerland. ⟨hal-01334083⟩