The relative permeability of CO₂ and brine has a significant impact on CO₂ saturation, migration, and injectivity for CO₂ geological storage. This study presents a new experimental apparatus consisting of a double separator that can reduce uncertainties in measuring fluid saturation. It was applied to measure relative permeabilities of in-situ cores samples of Berea, Gorae, and Paaratte sandstone. The wettability criteria and Brook-Corey model were applied to explain the characteristics in relative permeability of CO₂ and brine. The result for Berea sandstone using the developed apparatus was consistent with results obtained in literatures, and they indicate high residual brine saturation and low end-point relative permeability of CO₂. The results for Gorae sandstone show that the residual brine saturation is higher and the shape of the relative permeability curves are more concave compared to those of Paaratte sandstone; these results relate to the water-wetting tendency and dominant capillary flow, respectively. It means that injection of CO₂ into Gorae sandstone is expected to be less efficient than into Paaratte sandstone. Therefore, it is reasonable to estimate that less amount of CO₂ should be injected into Gorae sandstone compared to Paaratte sandstone.

CO ₂和盐水的相对渗透率对CO _2的地质储量的CO ₂饱和度，迁移和注入性具有重要影响。这项研究提出了一种由双分离器组成的新型实验设备，该设备可以减少测量流体饱和度的不确定性。它用于测量Berea，Gorae和Paaratte砂岩的原位岩心样品的相对渗透率。应用润湿性准则和Brook-Corey模型解释了CO ₂和盐水的相对渗透率特征。使用开发的仪器获得的Berea砂岩的结果与文献中的结果一致，它们表明高残留盐水饱和度和低CO终点相对渗透率₂。Gorae砂岩的结果表明，与Paaratte砂岩相比，剩余盐水饱和度更高，相对渗透率曲线的形状更凹。这些结果分别与水的润湿趋势和主要的毛细管流动有关。这意味着将CO ₂注入Gorae砂岩的效率要低于注入Paaratte砂岩的效率。因此，可以合理地估计，与帕拉特砂岩相比，戈拉砂岩中应注入的CO ₂量更少。