cap rock

基本解释

The third parameter needed for an oil field to occur is the cap rock or seal .
形成油田所必须的第三个参数是盖层岩石或封闭层。
A type of positive gravity anomaly that results from the presence of a dense cap rock overlying a relatively low-density salt dome.
一种正的重力异常，是由上覆在相对低密度的盐丘上的致密的盖层岩石引起的。
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Pressure seal is only formed in mudstone cap rock with undercompaction and its seal capability can be computed by equivalent depth method and sonic moveout value.
压力封闭的形成仅存在于具有欠压实的泥岩盖层中，其封闭能力的大小可根据等效深度法和利用声波时差值计算得到。

They occur in nearly any complex environment and may be acting as source rock, reservoir or cap rock.
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Lastly, it needs to be covered with a layer of non-porous, non-cracked rock to provide a leakproof cap.
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a layer of rock that overlies a salt dome and consists of limestone, gypsum, etc