润湿性为中性或弱水湿时，微观驱替效率达到最大。
When the wettability is neutrally and slightly water wet, the displacement efficiency is maximal.
第三，为了计算孔隙模型的微观波及效率，本文给出了驱替液波及边界的定义，并采用速度法确定其在流场中的位置。
Third, in order to calculate microscopic sweep efficiency in pore models, we define sweep boundary of displacement fluid, and determine it by velocity method.
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