The critical points ofCO2-H2O, NaCl-H2O and CO2-NaCl-H2O fluid mixtures were measured by observing the disappearance and reappearance of the meniscus by using the visible-type autoclave. The critical points of CO2-H2O and NaCl-H2O fluids shift linearly with the variation in ion concentrations.The general tendency of the critical point shifting of H2O-NaCl-CO2 multi-component fluid was similar to the H2O-CO2 fluid. However at higher NaCl concentrations, the variation in the critical point was higher for higher CO2 concentrations. This phenomenon is believed to be due to the interaction of ion or ions with water molecules in the fluid.
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