Reservoir heterogeneity at various length scales is a well-established fact. This includes reservoir wettability − a key factor influencing CO₂ geo-storage efficiency and containment security − which changes with depth, and is generally non-uniform due to different depositional environments and fluid flow paths over geological times. However, the effect of heterogeneous wettability distribution on CO₂ storage efficiency is not understood. Moreover, there is a knowledge gap in terms of how temperature affects capillary and dissolution trapping, CO₂ mobility and vertical CO₂ migration distance, particularly when coupled with wettability heterogeneity effects. Thus, in this work we studied the effect of wettability heterogeneity and reservoir temperature on the vertical CO₂ plume migration, and capillary and dissolution trapping capacities. Our results clearly show that both wettability heterogeneity and reservoir temperature have a significant effect on vertical CO₂ migration, and the associated capillary and dissolution trapping mechanisms: both heterogeneously distributed wettability and higher temperature significantly accelerated the vertical CO₂ migration, CO₂ mobility and solubility trapping, while it reduced residual trapping. We thus conclude that wettability heterogeneity and reservoir temperature are important factors in the context of CO₂ geo-storage, and that heterogeneous wettability and higher reservoir temperatures reduce storage capacity.

各种长度尺度的储层非均质性是公认的事实。这包括储层的润湿性-影响CO ₂地质存储效率和安全性的关键因素-随深度而变化，并且由于地质时期不同的沉积环境和流体流动路径而通常不均匀。但是，不均一的润湿性分布对CO ₂储存效率的影响尚不清楚。此外，在温度如何影响毛细管和溶出物捕获，CO ₂迁移率和垂直CO ₂方面存在知识差距。迁移距离，特别是与润湿性异质性效应相结合时。因此，在这项工作中，我们研究了润湿性非均质性和储层温度对垂直CO ₂羽流迁移以及毛细血管和溶存捕集能力的影响。我们的结果清楚地表明，润湿性非均质性和储层温度对CO ₂垂直运移都有显着影响，并且相关的毛细作用和溶蚀捕集机制：非均质分布的润湿性和较高的温度都显着加速了垂直CO ₂运移，CO ₂流动性和溶解性捕集，同时减少了残留的捕集。因此，我们得出结论，在CO ₂地层储藏的背景下，可湿性的非均质性和储层温度是重要的因素，而非均质的可湿性和较高的储层温度会降低储量。