Preliminary Research on CO_2 Leakage Safety Risk Assessment Method of Geological Storage Project

As a direct and effective carbon abatement technology,CO2 geological storage belongs to environmental protection projects.On the basis of generalization of the existing methods of CO2 geological storage risk assessment at home and abroad,the definition of CO2 geological storage safety risk assessment suitable for China was discussed in this paper,combined with CO2 geological storage mechanism and property,international experience as well as the risk assessment methods on engineering project such as the landfill of nuclear waste and industrial solid waste in China.The main contents of CO2 geological storage safety risk assessment were divided into risk identification,risk evaluation and risk control.On the basis of the research on CO2 leakage channels and possible environmental hazards,hierarchy indicators system for safety risk of CO2 leakage composed of four risk factors of index layers and its sublayers involved with geological,engineering units,construction and other factors was established to preliminarily present the risk assessment method and acceptable safety risk criterion on CO2 leakage.Finally,the CO2 geological storage leakage risk control methods were suggested which could provide a guideline for safety risk assessment in site selection,engineering implementation and monitoring.