Cost-Competitive and Self-Supporting Geothermal Energy, CO2-EOR and CO2 Storage Concept: Case Study of the E6 Structure in the Baltic Sea

Abstract

New cost-competitive concept of the pilot project combining CGS, CO2-EOR/EOR+ and geothermal energy recovery during CO2 geological storage, or CO2 plume geothermal (CPG) in different geological formations of the E6 structure offshore Latvia is proposed in this paper. The proposed scenario considers (1) single CO2 injection well to the Cambrian Deimena Formation for CGS and CPG, used also for CO2 injection via horizontal wells into located above the Upper Ordovician Saldus Formation limestone oil reservoir (for CO2-EOR/EOR+), (2) oil recovery well to the Saldus Formation and (3) geothermal energy recovery well to the Deimena Formation. Compared to the recently proposed scenarios of synergy of CGS and CO2-EOR/EOR+, we updated the concept by (1) adding the CPG and (2) proposed an extended idea for more economic scenario of CO2 injection. Profits of the synergy were analysed and possible risks analysis presented recently were updated for two possible cases of CO2 storage (upward CO2 leakage by faults from Deimena to Saldus Formation, and no-leakage case) in this study. The leakage of the injected CO2 from the Cambrian to the Upper Ordovician reservoir we have estimated recently as a profit.

Keywords: CO2 geological storage; CCS, CCUS; EOR+; CO2-EOR; CPG; Geothermal Energy Recovery; Cambrian Series 3 Deimena Formation; Ordovician Saldus Formation; offshore Latvia, CO2 for geothermal, GHGT-14