High-resolution X-ray imaging combined with a steady-state flow experiment is used to demonstrate how pore-scale displacement affects macroscopic properties in an altered-wettability microporous carbonate, where porosity and fluid saturation can be directly obtained from the grey-scale micro-CT images. The resolvable macro pores are largely oil-wet with an average thermodynamic contact angle of 120°. The pore-by-pore analysis shows locally either oil or brine almost fully occupied the macro pores, with some oil displacement in the micro-porosity. We observed a typical oil-wet behaviour consistent with the contact angle measurement. The brine tended to occupy the larger macro pores, leading to a higher brine relative permeability, lower residual oil saturation, than under water-wet conditions and in a mixed-wet sandstone. The capillary pressure was negative and seven times larger in the carbonate than the sandstone, despite having a similar average pore size. These different displacement patterns are principally determined by the difference in wettability.

高分辨率X射线成像与稳态流动实验相结合，用于证明孔尺度位移如何影响可润湿性微孔碳酸盐的宏观性质，其中孔隙率和流体饱和度可直接从灰度微孔获得-CT图像。可分辨的大孔在很大程度上是油润湿的，平均热力学接触角为120°。逐孔分析表明，油或盐水在局部几乎完全占据了大孔隙，微孔隙中有一些驱油作用。我们观察到典型的油湿行为与接触角测量结果一致。与水湿条件和混合湿砂岩相比，盐水倾向于占据较大的大孔隙，从而导致较高的盐水相对渗透率，较低的剩余油饱和度。尽管平均孔径相似，但毛细管压力为负值，碳酸盐中的毛细压力比砂岩大七倍。这些不同的位移模式主要由润湿性的差异决定。