盖层厚度是评价盖层的一个重要参数。盖层厚度虽然与盖层封闭能力之间没有直接关系 ,但在很大程度上却控制着盖层的各种封闭能力。从理论和油田实例两方面阐述了盖层厚度与其各种封闭能力之间的关系 ,认为盖层厚度与毛细管封闭能力、压力封闭能力和浓度封闭能力之间均为正相关关系 :盖层厚度越大 ,毛细管封闭能力越强 ,压力封闭能力越强 ,浓度封闭能力越强 ;反之亦然。

Thickness is an important parameter in evaluating caprock. There is not direct relation between thickness and seal abilities of caprock,but it controls each seal ability of caprock in fixed degreen. There is direct proportion relation between thickness and capillary seal ability of caprock or pressure seal ability of caprock, or concentration seal ability of caprock. This paper discussed the relation between thickness and each seal ability of caprock from theory and actual data in oil or gas field.