Study On Evaluation Method For Safety Risk Of CO₂Gological Storage

Emission reduction of greenhouse gas such as CO2has become an important research content in the environmental field. Geological storage technology is an effective new technology to reduce CO2emission, which has attracted huge environmental workers’attention at the present time.According to the characteristics of CO2, with full consideration of the particularity of CGS(CO2Geological Storage), this paper will introduce the potential security risks in detail and point out the need of safety risk evaluation for CGS. Taking the Salty water aquifers as storage place, this paper will analyze CGS security risk factors and choose the appropriate indexes to instruct the safety risk evaluation indexes system on the basis of the AHP(Analytic Hierarchy Process) structure. According to comparison of the weights, five main risk factors will be got by using the AHP method that can determine the safety risk index weights.Three target areas are selected respectively in the Ordos Basin and Loop Basin of which indexes are identified. According to the fact that some fuzzy factors in the evaluation of CGS safety risk which can’t be described accurately by math formula, there is a big characteristic of fuzziness. Fuzzy comprehensive evaluation method is introduced to evaluate the CGS safety risk. Three operational methods are used to evaluate the CGS safety risk of the target areas comprehensively and evaluation indexes are gained. The optimal storage site is got according to maximum membership principle. The research findings of this paper will provide theoretical foundation for the CO2geological storage safety risk evaluation.