Evaluation of geological storage potential of Yanchang Oilfield based on entropy weight TOPSIS method
A method based on entropy weight TOPSIS is proposed to evaluate the suitability of storage sites for large-scale carbon dioxide oil recovery and storage(CO2-EOR)projects,which is usually evaluated with subjective and single-indicator method.This method is suitable for screening oil recovery and storage sites of large-scale CCUS project.Multiple key factors such as rock physical properties,reservoir geological conditions,and chemical composition of crude oil were selected as evaluation indicators.Through adding entropy weight to reduce the subjectivity of TOPSIS method,the suitability of oil recovery and storage in 157 development blocks of Yanchang Oilfield was graded and evaluated.The results showed that the immiscible oil displacement suitability of oil and gas reservoirs in Yanchang Oilfield was divided into three suitability levels,with"high suitability"and"medium suitability"sealing blocks accounting for 87％,and most of the blocks were located in the western and southern blocks.The assessment of CO2 storage potential showed that the theoretical storage capacity of 46"highly suitable"blocks reached 11.1 ×10 8 t,accounting for 56％of the total theoretical storage capacity,involving geological reserves of 15.2× 10 8t.The block with the highest theoretical storage capacity was the Hechuan block,reaching 6800x104 t,followed by the Danba block of Zhidan Oil Production Plant with 6048× 10 4 t.It was recommended to prioritize the selection of 14 blocks with a suitability score greater than 0.85 and a theoretical storage capacity of 3.64x108t as the preferred storage blocks for the large-scale CCUS projects of Yanchang Oilfield.The research results can provide methodological references for the optimal selection of storage blocks for large-scale CCUS projects in oil fields.
CO2 geological storagereservoir screeningsuitability assessmentstorage potential evaluation
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