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Geochemical Perspectives on Underground Energy Storage Coupled with CO2 Utilisation and Sequestration: Insights from CEEGS

Authors

Behnous,  D.
External Organizations;

Carneiro,  J.
External Organizations;

Gianni,  E.
External Organizations;

Tyrologou,  P.
External Organizations;

/persons/resource/farkas

Farkas,  Marton Pal
4.3 Geoenergy, 4.0 Geosystems, Departments, GFZ Publication Database, GFZ Helmholtz Centre for Geosciences;

/persons/resource/conny

Schmidt-Hattenberger,  Cornelia       
4.3 Geoenergy, 4.0 Geosystems, Departments, GFZ Publication Database, GFZ Helmholtz Centre for Geosciences;

Fernández-Canteli Álvarez,  P.
External Organizations;

García Crespo,  J.
External Organizations;

Chartegui Ramirez,  R.

Carro Paulete,  A.

Koukouzas,  N.

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Citation

Behnous, D., Carneiro, J., Gianni, E., Tyrologou, P., Farkas, M. P., Schmidt-Hattenberger, C., Fernández-Canteli Álvarez, P., García Crespo, J., Chartegui Ramirez, R., Carro Paulete, A., Koukouzas, N. (2024): Geochemical Perspectives on Underground Energy Storage Coupled with CO2 Utilisation and Sequestration: Insights from CEEGS - Abstracts, Fifth EAGE Global Energy Transition Conference & Exhibition (GET 2024) (Rotterdam, Netherlands 2024).
https://doi.org/10.3997/2214-4609.202421187


Cite as: https://gfzpublic.gfz.de/pubman/item/item_5037496
Abstract
The CEEGS (Carbon-Dioxide Electrothermal Energy and Geological Storage) project integrates electrothermal and geological systems to create a scalable energy storage solution using renewable energy. It combines transcritical CO2 cycles with underground storage, using captured CO2 for heat pumps to store surplus energy both thermally and mechanically. The system stores mechanical energy through pressure, similar to compressed air storage, and benefits from CO2 sequestration. Deep saline aquifers are identified as feasible geological reservoirs.

Initially, CO2 is injected continuously for two years (plume establishment stage) before entering charge-discharge cycles. The study focuses on the plume establishment and the impact of geochemistry on CO2. High-purity CO2 is required, but its composition can vary due to interactions with reservoir minerals and brine, affecting storage effectiveness. The study utilized PHREEQC and CMG-GEM for simulations, examining CO2 sequestration through dissolution and residual trapping.

Results showed that CO2 acidifies the reservoir, dissolving certain minerals. About 8.1% of injected CO2 was dissolved during the injection period. Impurities slightly increased the CO2 plume extent. Solubility and residual trapping were identified as dominant short-term sequestration mechanisms. Future research should extend the study period and explore different CO2 impurity levels to optimize system efficiency and costs.