盖层封闭的最常见形式是毛管封闭和压力封闭。 这两种形式的封闭能力与岩层的孔隙度、渗透率、砂泥岩含量比以及流体压力有密切关系。
The sealing capability of cap rocks is closely related to the porosity, permeability, the ratio of sand to mud contents and fluid pressure of the rocks.
泥岩经压实固结成岩后，其孔隙度变小，从开始具有封闭能力，到封闭能力逐渐变好。
After its compaction into rock, mudstone has lower porosity and its sealing capability becomes better.
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