中文摘要：

CO2地下盐水层封存是减排CO2、缓解气候变化的可行方案之一。CO2盐水溶液密度影响CO2在储层中的扩散和运移,从而影响封存的安全性;因此,对于CO2盐水层封存十分重要。文章从实验测量和数学模型两个角度总结了对CO2水溶液密度的研究进展,认为现有实验数据的工况范围能够覆盖封存条件范围,但在数量和准确性方面都无法满足CO2地下盐水层封存需要。现有溶液密度模型大多数是经验公式,适用范围较窄、预测精度不高。理论模型正处于研究阶段,基于SAFT状态方程的理论模型是目前的研究热点。因此,需要系统研究封存条件下的CO2水溶液密度与温度、压力、CO2质量分数、盐度等因素之间的关系,建立适用范围广、预测精度高的理论模型,为CO2地下盐水层封存提供必要的支持。

英文摘要：

Sequestration of CO2 into underground saline aquifer is considered as a viable option to reduce CO2 and mitigate climate change.The density of CO2 salt solution is a key parameter for CO2 saline aquifer storage which determines the diffusion and migration of CO2 in reservoir and then affects the storage safety.Research progress of the density of CO2 aqueous solution from an experimental and a simulation perspective were summarized.It was found that although the operating range of existing density data nearly covered the scope of storage conditions,they cannot meet the needs of sequestration in terms of quantity and accuracy.Most of the existing model are empirical formula,which have a narrow applicable range and low prediction accuracy.Theoretical model is in the research stage,in which the theoretical model based on SAFT Equation of State is the research focus at present.It is necessary to investigate the relationship between density of CO2 aqueous solution and factors such as temperature,pressure,CO2 concentration and salinity under sequestration conditions systematically and build a theoretical model with wide applicable range and high prediction accuracy in order to provide necessary support for CO2 saline aquifer storage.