二氧化碳地质封存是减少二氧化碳排放、减缓全球气候变暖的重要途径，二氧化碳提高石油采收率为二氧化碳地质封存的主要方法。如果在油藏压力温度条件下，二氧化碳与石油发生混相，石油采收率提高幅度将达到最大化、经济效益最好。本项目拟从胶体界面化学角度，研究二氧化碳在有机液体中的溶解、二氧化碳分子在有机液体中的聚集、液相中有机液体分子的聚集、液相中二氧化碳分子与有机液体分子的聚集、二氧化碳与有机液体的混相及非混相等问题；研究二氧化碳分子间作用力、有机液体分子间作用力、二氧化碳分子与有机液体分子间作用力和有机液体分子结构对近临界、超临界二氧化碳在有机液体中分散特性的作用和影响。基于上述研究结果，在分子水平上揭示阐明二氧化碳与石油及有机液体的混相机理，微观上二氧化碳在石油及有机液体中的分散状态及其对混相的影响。

CO2 geological sequestration is one of the most important methods to reduce CO2 emision and to slow down the global warm phenomenon. CO2 flooding to enhance oil recovery is main method of CO2 geological sequestration. If CO2 and oil can get miscible which means oil and CO2 become one phase fluid under reservoir condition, the efficiency of enhanced oil recovery will be the highest and the economic benefits will be maximized. From the view of colloid chemistry and surface chemistry, the project will study the scientific issues of CO2 solubility in organic liquids, the aggregation of CO2 molecules in organic liquids, the aggregation of organic liquid molecules in liquid phase, the aggregation of CO2 molecule and organic liquid molecule in liquid phase and the miscible or immiscible phenomenon of CO2 and organic liquids. The project will also investigated the effect of intermolecular force of CO2, the intermolecular force of organic liquids, the intermolecular force between CO2 and organic liquids and the molecular structure of the organic liquids on the dispersion state of supercritical CO2 in organic liquid phase.Based on the results, this project focusing on investigating the mechanism of miscible phenomenon of CO2 with crude oil and organic liquids at the molecular level, the microcosmic dispersion state of CO2 in crude oil or organic liquids under different conditions and the effect of the microcosmic dispersion state of CO2 in crude oil or organic liquids on miscible phenomenon.