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oa CO2-Brine-Rock Interactions: Influence of Reservoir Conditions on Wettability and Storage Efficiency in Dolomite Formations
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, World CCUS Conference 2025, Sep 2025, Volume 2025, p.1 - 5
Abstract
Interfacial tension (IFT) and contact angle (CA) play a crucial role in determining CO2 trapping efficiency as they also impact capillary pressure and relative permeability of the CO2-brine systems. Accurate characterization of these parameters under reservoir conditions is essential for assessing wettability alterations and ensuring long-term CO2 storage stability.
This study investigates the influence of pressure, temperature, and salinity on the IFT and wettability of CO2-brine systems in contact with carbonate formations. A drop shape analyzer was utilized to measure IFT and contact angle under reservoir pressure and temperature conditions. Pendant drop method was employed to evaluate IFT between CO2 and synthetic brine at elevated pressures and temperatures. Additionally, the sessile drop method was applied to determine the contact angle of CO2/brine/rock systems.
The results indicate that IFT between brine and CO2 increases with temperature and salinity but decreases with increasing pressure due to enhanced CO2 solubility in brine. Similarly, contact angle values increase with pressure, temperature, and salinity.
These findings provide valuable insights into the fluid-fluid and fluid-rock interactions in carbonate reservoirs under geological storage conditions. This study underscores the significance of IFT and wettability modifications in influencing CO2 migration, trapping efficiency, and storage security.