oa Exploring Dissolved CO2 Storage Potential in Shallow Clastic Reservoirs of Rift Basins

This study explores the viability of dissolved CO2 storage in shallow clastic saline aquifers of rift basins, where conventional methods face challenges. Using advanced reactive transport modeling techniques, we investigated the impact of various parameters such as aquifer properties, water chemistry, and reservoir mineralogy on dissolved CO2 storage. The research reveals a rapid increase in CO2 solubility up to 2,000 feet depth, with slower variations thereafter due to salinity influences. It indicates shallow clastic saline aquifers have a potential to store ∼6 Mt of CO2 per km3 of rock. Furthermore, the study highlights the significant effects of brine salinity, reservoir mineralogy, and injection water composition on trapping mechanisms, with carbon mineralization being enhanced in high-salinity formation water scenarios. The results demonstrate the potential for safe and efficient CO2 storage through geochemical interactions in shallow clastic reservoirs. Factors such as aquifer salinity, mineralogy, dipping angles, and injection water chemistry play critical roles in determining storage success.