<p>Carbon Capture and Storage (CCS) is essential for reducing CO2 emissions by capturing atmospheric or industrial emissions and storing them underground. Saline aquifers are ideal storage options due to their abundance and geological suitability. When CO₂ is injected into these aquifers in supercritical state it attains gas-like mobility and liquid-like density that helps it move efficiently through the porous rock. A combination of structural alongside residual, solubility and mineral trapping mechanisms enables CO₂ to stay contained underground for long periods while preventing its release into the atmosphere. The evaluation of CCS effectiveness and safety in India depends upon thorough knowledge of CO₂ behaviour within saline aquifers. The Upper Assam and Jaisalmer Basins were analysed by studying injection rate, duration and pressure evolution while assessing CO₂ dissolution and the influence of temperature, capillary pressure, pH and brine salinity on convection, mineralisation and halite precipitation. A field-scale mechanistic model was developed using actual mineralogical and reservoir data from the Upper Assam Basin. CO₂ was injected for 10&#xa0;years, and the system was simulated for 100&#xa0;years to assess long-term storage behaviour. Simulation results showed lower injection rates, simultaneous water injection and reduced salinity conditions result in enhanced CO₂ dissolution and stable plume migration along with improved storage efficiency. Capillary pressure and high vertical permeability enhance trapping mechanisms, while high salinity and impurities can reduce storage potential. Heterogeneous models provide a more realistic representation of CO₂ movement and storage performance. These findings support the feasibility and strategic planning of CCS in Indian subcontinent.</p>