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首页> 外文期刊>Geochemistry, geophysics, geosystems >The change in contact angle at unsaturated CO2-water conditions: Implication on geological carbon dioxide sequestration
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The change in contact angle at unsaturated CO2-water conditions: Implication on geological carbon dioxide sequestration

机译：非饱和二氧化碳水条件下接触角的变化：对地质二氧化碳固存的意义

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摘要

The performance of a geologic carbon storage site strongly depends on the capillary pressure of sealing rock and formations. While wettability of minerals is a key factor in capillary pressure, published contact angles are inconsistent. This study explores the discrepancy of published contact angles in order to reduce the uncertainty of measured laboratory contact angles, and understand the variation of contact angles at unsaturated CO2-water conditions. A ratio of droplet dimension and triple line (or contact line) are used to explain the observed wide range of contact angles and the variation of contact angle at unsaturated conditions. Results show that the shape factor has a good agreement with contact angle change during CO2 dissolution in water. Silica substrate has clear two pinned and slip stages of triple line during CO2 droplet dissolution, which cause contact angle on silica substrate to increase from 34.58 to 42.18. However, mica substrate has the repeated pinned and slip stages due to the heterogeneity of mica surface, which cause contact angle to increase dramatically from 25.48 to 68.18. Thus, both the impact of the unsaturated CO2-water conditions on the wide range of contact angle and the heterogeneity of mineral surface should be considered when one estimates capillary pressure based on contact angle in geological CO2 sequestration.
机译：地质碳储藏点的性能在很大程度上取决于密封岩石和地层的毛细压力。尽管矿物的润湿性是毛细血管压力的关键因素，但公开的接触角却不一致。这项研究探索了已公开的接触角的差异，以减少所测量的实验室接触角的不确定性，并了解在不饱和CO2水条件下接触角的变化。液滴尺寸与三重线（或接触线）之比用于解释观察到的宽接触角范围以及在不饱和条件下接触角的变化。结果表明，形状因子与二氧化碳在水中溶解过程中的接触角变化具有良好的一致性。二氧化硅基材在溶解CO2液滴期间具有清晰的三个线的两个固定和滑动阶段，这导致二氧化硅基材上的接触角从34.58增加到42.18。然而，由于云母表面的异质性，云母基底具有重复的钉扎和滑动阶段，这导致接触角从25.48急剧增加到68.18。因此，在地质封存中根据接触角估算毛细管压力时，应考虑不饱和CO2水条件对宽范围接触角的影响以及矿物表面的不均匀性。

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