Over the past several hundred years, CO2 emissions in the atmosphere has increased steadily and risen over the preindustrialized level due to intensified human activity producing greenhouse gas emissions such as burning fossil fuels for electricity generations, industries, transportations and domestic uses. The increase of atmospheric CO2 emission has become a major contributing factor of a gradual raise of the earth’s temperature, popularly known as global warming. Recently, the methods of reducing CO2 emission have been developed including carbon capture and geological storage (CCS). So far, CCS in depleted oil and gas reservoirs is the most readily applicable since the technique is similar to the enhanced oil recovery (EOR) commonly applied in petroleum industries (IPCC, 2005). Even though oil and gas reservoirs remain worldwidely available, these reservoirs are inequitably distributed around the world. Therefore, deep saline aquifers are recently investigated since their estimated storage capacities is far largest compared to the other formations.