为了明确CO₂咸水层封存过程中岩心润湿性对渗流过程的影响，本文基于与核磁共振(NMR)技术相结合的孔隙级渗流模型的方法，研究了咸水层润湿性变化对渗流过程的影响，为揭示润湿性作用下的两相渗流规律提供了理论支撑。本文首先通过NMR技术测得了渗流过程中的饱和度参数，定量分析得到了平均弛豫时间和咸水饱和度的二次函数耦合关系。之后，在二维层面基于水平集法，通过将润湿性设置为不同润湿水平及空间位置函数，模拟CO₂在多孔介质中驱替咸水中储层不同润湿性对渗流过程的影响。研究发现，基于核磁共振纵向弛豫时间(T₁)及横向弛豫时间(T₂)与咸水饱和度(S)的函数耦合关系，可以较好表征CO₂驱替咸水过程中的岩心润湿性变化。基于孔隙级渗流模型表征孔隙尺度下的润湿性各向同性，发现当岩心润湿性处于极端情况，如强亲水(θ=0°)、中性润湿(θ=90°)或者强疏水(θ=180°)状态时，残余水饱和度较低，驱替效果较好。对于润湿性各向异性，驱替过程较为复杂，其对相对渗透率和残余咸水饱和度的影响各异，尤其入口端和出口端的不同润湿性表现会直接影响两相渗流过程，入口端越亲水且出口端越疏水时，咸水渗流速度越快；这可能是由于润湿性各向异性会导致渗流行为的不均匀分布，从而导致渗流速率和驱替效率在空间上和时间上的差异；可见，渗流通道的物性特征对渗流过程的影响较大。未来研究除了关注咸水层空间尺度下的相关变化外，还需注重时间尺度下的不同影响。

To clarify the influence of core wettability on the seepage process during the CO₂ saline aquifer storage, this paper studies the influence of wettability change in the saline aquifer on the seepage process based on the pore-level seepage model combined with nuclear magnetic resonance (NMR) technology, providing theoretical support for revealing the two-phase seepage law under the effect of wettability. Firstly, the saturation parameters during the seepage process are measured by NMR technology in this paper, and the quadratic function coupling relationship between wettability and brine saturation is quantitatively analyzed. Later, based on the level set method at the two-dimensional level, by setting wettability as different wetting levels and spatial position functions, the influence of different wettability of the reservoir in displacing brine in the porous medium by CO₂ on the seepage process is simulated. It was found that based on the functional coupling relationship between nuclear magnetic resonance longitudinal relaxation time (T₁) and transverse relaxation time (T₂) and saline water saturation (S), the core wettability changes during CO₂ displacement of saline water could be well characterized. Based on the pore-scale seepage model representing the isotropy of wettability at the pore scale, it was discovered that when the core wettability was in extreme conditions, such as strongly hydrophilic (θ = 0°), neutrally wetted (θ = 90°), or strongly hydrophobic (θ = 180°), the residual water saturation was lower and the displacement effect was better. For anisotropic wettability, the displacement process was more complex, and its influence on relative permeability and residual saline water saturation varied. Especially, different wettability manifestations at the inlet and outlet ends would directly affect the two-phase seepage process. When the inlet end was more hydrophilic and the outlet end was more hydrophobic, the saline water seepage velocity was faster; this might be due to the anisotropic wettability causing the uneven distribution of seepage behavior, thereby resulting in spatial and temporal differences in seepage rate and displacement efficiency; it can be seen that the physical characteristics of the seepage channel have a significant influence on the seepage process. Future research needs to focus on the different effects at time scales in addition to the associated changes at spatial scales in the saline aquifer.