Study and Experiment on Evaluation Method of CO2 Storage Suitability for Low Permeability Reservoir in Yanchang Oilfield
[Purposes]CO2 geological storage is one of the important methods to implement the national"double carbon"goal.Establishing a perfect site selection standard is a prerequisite for ensuring safe storage and can improve the success rate of CO2 geological storage.[Methods]In view of the difficulties in selecting the location for CO2 sequestration in Yanchang Oilfield,the evaluation index system was es-tablished from three aspects:engineering geological conditions,sequestration potential conditions,and social and economic conditions,based on the principles of"safety first,economy,technology and environ-ment friendly"and the successful implementation of CO2 sequestration reservoir examples at home and abroad.A multi-level grey evaluation model is established by using analytic hierarchy process and grey correlation method.[Findings]The results show that the model can accurately evaluate the suitability of CO2 storage in each block of Yanchang Oilfield.[Conclusions]Research findings provide an effective method for selecting the optimal site for CO2 storage in low permeability reservoir of Yanchang oilfield.
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