The super-atomization of liquid CO2 aimed at stable geological storage has been performed. All of geological storage techniques are required to prevent rising up of injected CO2 due to buoyancy effect. As an example, caprock CO2 trapping prevents the CO2 rising up by impermeable layer, however this technique depends onto the geological structure and there are leakage risk. Therefore we proposed a new technique of trapping super-atomized liquid CO2 in the porous structure to realize stable geological storage and to boost the efficiency of storage. In this study, the super-atomization process and the emulsion stability have been observed. As the result, the liquid CO2 was able to be super-atomized the same scale as gap diameter of the sandstone aquifer. (C) 2008 Elsevier Ltd. All rights reserved