The compaction constant is 1.0 for a completely compacted formation and less than 1.6 for an uncompacted formation.
对于完全压实的地层，压实常数为1.0；未压实的地层，压实常数小于1.6。
The study shows that the driving force of primary hydrocarbon migration in Yanchang formation is provided by the superfluous pressure produced when Chang-7 oil layer set was compacted.
研究认为，延长组长7油层组由压实作用产生的过剩压力提供了油气初次运移的动力。
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