To help reduce greenhouse gas emissions, carbon dioxide (CO₂) can be stored deep underground in porous rock formations such as sandstone through a method called geologic carbon storage (GCS). However, when CO₂ is injected into the ground, it can react with certain minerals in the rock, such as carbonates, causing them to dissolve. These chemical changes can affect how easily CO₂ moves and gets trapped underground, which is important for long-term storage safety. In this study, high-resolution micro-CT imaging was used to capture detailed 3D pictures of the sandstone rocks that contain different amounts of carbonate minerals. These detailed images were then used to build digital models of the tiny spaces (pores) between rock grains. By digitally removing carbonate minerals, the resulting models simulate the rock’s structure after mineral dissolution. These models help reveal how such changes may influence the movement and trapping of CO₂. Initial analyses indicate that carbonate dissolution can widen flow pathways and enhance connectivity, potentially allowing CO₂ to migrate more easily underground. However, this may also reduce the amount of CO₂ that becomes permanently trapped. The findings improve understanding of microscopic changes during carbon storage, supporting the development of safer and more reliable storage systems.