Perpustakaan Digital ITB

Carbon Capture and Storage (CCS) in saline aquifers offers large-scale potential for CO? sequestration, yet operational challenges persist due to salt precipitation near the wellbore. When dry CO? is injected, brine vaporization can trigger halite deposition, causing permeability impairment and injectivity decline—two critical issues that directly affect the efficiency and economics of CCS projects. This study applies numerical simulation using CMG-GEM to investigate the mechanisms of salt precipitation and its impact on injectivity in a synthetic high-permeability reservoir model (35% porosity, 740 mD permeability). The analysis specifically examines the influence of grid size, injection rate, salinity, and capillary pressure parameter on the extent and distribution of salt deposition, as well as the resulting changes in reservoir properties and well performance. Through sensitivity studies on these governing parameters, the research aims to provide a clearer understanding of the physical mechanisms driving injectivity reduction during CO? injection. The findings are expected to support better design and optimization of CCS operations in saline aquifers, ensuring more reliable and sustainable longterm CO? storage.