Wettability of CO₂/brine/clay is one of the most important parameters in assessing CO₂ storage capacities and containment security. Despite its importance, the literature data in this context are very limited. We thus systematically measured montmorillonite, illite, and kaolinite wettability for CO₂/brine, nitrogen/brine, and nitrogen/oil systems at various pressures (5, 10, 15, and 20 MPa) and temperatures (305 and 333 K). The zeta potential of each clay mineral was also measured to investigate its link to the macroscopic contact angle. The results show that both advancing and receding water contact angles for CO₂/brine, nitrogen/brine, and nitrogen/oil systems increase with an increase in pressure. However, they are only slightly reduced by increasing temperature. It was also shown that montmorillonite has a higher water contact angle in the presence of CO₂, followed by illite and kaolinite. The same trend was measured for nitrogen/brine and brine/oil systems. Consequently, montmorillonite is strongly oil-wet; kaolinite and illite, however, are strongly water-wet at typical storage conditions (high pressure and elevated temperature). This has important implications for CO₂ geostorage in determining the flow of CO₂ and its entrapment, fluid spreading, and dynamics in the reservoir.

中文翻译：

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高温高压下蒙脱石，伊利石和高岭石的二氧化碳/盐水，氮/盐水和油/盐水的润湿性

CO ₂ /盐水/粘土的润湿性是评估CO ₂储存能力和安全性的最重要参数之一。尽管很重要，但在这种情况下的文献数据非常有限。因此，我们系统地测量了在各种压力（5、10、15和20 MPa）和温度（305和333 K）下，CO ₂ /盐水，氮气/盐水和氮气/油体系中的蒙脱石，伊利石和高岭石的润湿性。还测量了每种粘土矿物的ζ电位，以研究其与宏观接触角的联系。结果表明，CO _2的前进和后退水接触角盐水，氮气/盐水和氮气/油体系随压力的增加而增加。然而，它们仅通过升高温度而稍微降低。还表明，在CO ₂存在下，蒙脱石具有更高的水接触角，其次是伊利石和高岭石。对于氮气/盐水和盐水/油系统，也测出了相同的趋势。因此，蒙脱石是高度油湿的。但是，高岭石和伊利石在典型的存储条件（高压和高温）下会被水强力润湿。这具有对CO重要的影响₂ geostorage在确定CO的流₂和它的截留，流体铺展在贮存器，和动力学。