Synergy Benefits in Combining CCS and Geothermal Energy Production

AbstractWhen injecting CO2 in to a subsoil aquifer for permanent CO2 storage the pressure build up in the regional area encircling the site can extend far beyond the site delineation and mitigation procedures must be considered.The pressure build up can be controlled by production of water from the aquifer. In that context the synergy effect bycombining CCS with geothermal energy production (GE) is obvious; i.e. the injection site for CCS may be surrounded by several GE plants, where the GE plants are operated so the net production of water can balance the injected CO2 from the CCS operation sufficiently. Furthermore, the CO2 plume migration may be controlled by operating the different sites as pressure sinks and sources. The paper illustrates the concept for an area in the northern part of Denmark, where a potential CCS site is characterized together with four prospective locations for GE plants. The GE plants are located in a radius of up to 10km from the CCS site but still outside the closure of the CCS site. The Eclipse 100 reservoir simulator is used for simulations