A unique laboratory facility is developed for the observation of subsurface CO 2 leakage evolution. A thin transparent tank is filled with different sizes of glass-beads to form controlled layered stratigraphies; then the medium is saturated with water mixed with a universal pH indicator. The flowcontrolled injection of CO 2is carefully controlled using pressure transducers with precise needle valve and, time-lapse photography permits capturing the evolution of gas invasion and diffusion. Results show the nature of CO 2 gas migration in the near surface, the effect of fine-grained layers such as the cap-rock, water acidification near conduits and subsequent diffusion, the convection of carbonated water. In addition to this trial to understand salient characteristics on subsurface CO 2 leakage, applicability of borehole based resistivity tomography is assessed. Measurement system for resistivity tomography is attached to the CO 2gas migration monitoring system. Produced resistivity images are compared with time-lapse digital images taken during CO 2 gas leakage simulation.