Simulation of CO2 injection in a cylindrical roCarbon Capture Storage (CCS) is a strategy to reduce anthropogenic CO2 emissions in order to mitigate climate change. Because of their widespread occurrence, huge potential capacity, and independence from previous hydrocarbon extraction, deep saline aquifers stand out among the other geological choices as one of the most attractive storage sites. After being injected into these formations, CO₂ interacts with the porous medium saturated with brine through a variety of processes, such as residual, solubility, structural, and ultimately mineral entrapment. To understand fundamental displacement mechanisms of CO2 in brine saturated porous media, pore- and plug- scale studies must be performed, nevertheless reservoir-scale models are crucial for long-term forecasts.