Assessment of CO2 leakage using mechanistic modelling approach for CO2 injection in deep saline aquifer of Lithuanian basin in presence of fault and fractures

Abstract

Injecting CO2 into deep saline aquifers is a prominent strategy for carbon capture and storage (CCS) to mitigate greenhouse gas emissions. However, ensuring the long-term integrity of CO2 storage is crucial to prevent leakage and potential environmental hazards. This paper investigates the impact of fracture permeability on CO2 leakage volumes in the context of CO2 injection into Syderiai deep saline aquifer for carbon capture and storage (CCS) applications. It explores the relationship between fracture permeability and the potential for CO2 leakage, as well as the volume of CO2 dissolved in water above and below the cap rock. Furthermore, the study examines how the leakage volume may evolve over time in Syderiai deep saline aquifer. A mechanistic model of Syderiai deep saline aquifer, of Lithuanian basin, was developed based on average permeability, porosity, NTG and thickness (Fig. 1) and is used in this analysis.