Sayindere cap rock integrity during possible CO2 sequestration in Turkey

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10.1016.j.egypro.2011.02.517.pdf

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2011

Author

Dalkhaa, Chantsalmaa
Okandan, Ender

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One way to reduce the amount of CO2 in the atmosphere for the mitigation of climate change is to capture the CO2 and inject it into geological formations. The most important public concern about carbon capture and storage (CCS) is whether stored CO2 will leak into groundwater sources and finally into the atmosphere. To prevent the leakage, the possible leakage paths and the mechanisms triggering the paths must be examined and identified. It is known that the leakage paths can be due to CO2 - rock interaction and CO2 - well interaction. The objective of this research is to identify the geochemical reactions of the dissolved CO2 in the synthetic formation water with the rock minerals of the Sayindere cap rock by laboratory experiments. It is also aimed to model and simulate the experiments using ToughReact software. Sayindere formation is a regionally extensive cap rock for many oil fields in southeastern Turkey. The mineralogical investigation and fluid chemistry analysis of the experiments show that calcite was dissolved from the cap rock core as a result of CO2- water- rock interaction. Using the reactive transport code TOUGHREACT, the modeling of the dynamic experiment is performed. Calcite, the main primary mineral in the Sayindere is dissolved first and then re-precipitated during the simulation process. The decreases of 0.01 % in the porosity and 0.03% in permeability of the packed core of the Sayindere cap rock are observed in the simulation. The simulation was continued for 25 years without CO2 injection. However, the results of this simulation show that the porosity and permeability are increased by 0.001 % and 0.004 %, respectively due to the CO2-water-rock mineral interaction. This shows that the Sayindere cap rock integrity must be monitored in the field if application is planned.

Subject Keywords

General Energy, CO2 storage, Cap rock integrity, CO2- water- rock interaction, Geochemical modeling and simulation

URI

https://hdl.handle.net/11511/58101

DOI

https://doi.org/10.1016/j.egypro.2011.02.517

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Department of Petroleum and Natural Gas Engineering, Conference / Seminar

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Citation Formats

C. Dalkhaa and E. Okandan, “Sayindere cap rock integrity during possible CO2 sequestration in Turkey,” 2011, vol. 4, p. 5350, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/58101.