cap rock

基本解釋

The third parameter needed for an oil field to occur is the cap rock or seal .
形成油田所必須的第三個蓡數(shù)是蓋層巖石或封閉層。
A type of positive gravity anomaly that results from the presence of a dense cap rock overlying a relatively low-density salt dome.
一種正的重力異常，是由上覆在相對低密度的鹽丘上的致密的蓋層巖石引起的。
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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.
壓力封閉的形成僅存在於具有欠壓實的泥巖蓋層中，其封閉能力的大小可根據(jù)等傚深度法和利用聲波時差值計算得到。

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