CO₂ enhanced water recovery (CO₂-EWR) is one of the most promising technologies for geologic carbon sequestration. The migration characteristics and displacement efficiency of supercritical CO₂ (SC-CO₂) after injection into a saline aquifer directly affect the feasibility and economy of a CO₂-EWR project. Multiple clay interlayers often develop in the target sandstone reservoir and combine in different expansive ways, which could influence the SC-CO₂ migration. In this study, core flooding experiments were conducted using a special sandstone with multiple thin clay interlayers and the fluid behavior was monitored by an X-ray computed tomography (X-CT) scanner. Based on the porosity matrix obtained from X-CT images, a two-dimension model based on Darcy flow was developed to simulate the fluid behavior under the experiment conditions. The experimental results show that SC-CO₂ pathways were developed in the sand part of the sample, while the clay interlayers were fluid-proof. Comparing the experimental and simulation results, it is evident that the porosity distribution, clay interlayers directionality/extent and flooding direction were the main factors that affected the fluid behavior in the sample. There were positive correlations between porosity and SC-CO₂ saturation after drainage processes. Flooding directions and clay interlayers were combined to affect the fluid migration. The clay interlayers had functions of barrier and collection when the flooding direction pointed towards the opening of a wedge-shaped semi-open area formed by clay interlayers. While this area was almost free of SC-CO₂ when the injection direction reversed, resulting a smaller SC-CO₂ saturation in sample during the backward drainage process.

CO ₂增强水回收率（CO ₂ -EWR）是用于地质碳固存的最有前途的技术之一。超临界CO ₂（SC-CO ₂）注入盐水层后的迁移特征和驱替效率直接影响着CO ₂ -EWR项目的可行性和经济性。目标砂岩储层中经常发育多个粘土夹层，并以不同的膨胀方式结合，这可能会影响SC-CO _2。移民。在这项研究中，岩心驱油实验是使用具有多个薄粘土夹层的特殊砂岩进行的，并通过X射线计算机断层扫描（X-CT）扫描仪监测了流体的行为。基于从X-CT图像获得的孔隙度矩阵，建立了基于达西流的二维模型来模拟实验条件下的流体行为。实验结果表明，SC-CO ₂样品的沙子部分形成了通道，而粘土夹层是防流体的。比较实验结果和模拟结果，很明显孔隙率分布，粘土夹层的方向性/程度和驱油方向是影响样品中流体行为的主要因素。排水后孔隙度与SC-CO ₂饱和度呈正相关。驱油方向和黏土夹层相结合以影响流体运移。当洪水方向指向由粘土夹层形成的楔形半开放区域的开口时，粘土夹层具有阻挡和收集的功能。虽然该区域几乎没有SC-CO ₂当注入方向反转时，在反向排水过程中样品中的SC-CO ₂饱和度较小。