Geological safety evaluation method for CO2 geological storage in deep saline aquifer

Abstract：CO2 geological storage projects belong to environmental protection projects, and geological safety is the primary factor for CO2 sequestration for a long time. Geological safety influencing factors of CO2 geological storage include cap rock suitability, site safety for earthquake, hydrogeological condition and geological condition of the ground site, of which cap rock suitability is the most important factor, and geological condition of the ground site is the main factor influencing project construction. According to an analysis of CO2 geological storage safety influencing factors, the authors built geological safety evaluation indexes system on the basis of the AHP structure and tentatively calculated the weights. It is held that CO2 geological storage safety could be evaluated comprehensively by fuzzy synthetic evaluation method. In addition, the geological safety evaluation method of CO2 geological storage and the means for safe project site selection in China’s deep saline aquifer are put forward in this paper.