摘要
压力封闭是与毛细管封闭明显不同的盖层封油气机理，主要是靠盖层与储集层之间孔隙流体压力差来封闭油气的，它既可封闭游离相的油气，又可封闭水溶相的油气。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。松辽盆地三肇凹陷下白垩统青山口组和嫩江组一、二段泥岩盖层普遍欠压实，孔隙流体具异常高压，最大可分别达到１５ＭＰａ和１０ＭＰａ，具有与毛细管封闭能力基本相当的压力封闭能力，对该区油气的聚集与保存起到了十分重要的控制作用。
Pressure seal, a different mechanisnl of enclosing oil-gas by cap rock from capillary seal,ellcloscs oil-gas mainly by the Pore fluid pressure differential between cap rock and reservoir.It not only can seal free phase oil-gas but also does aqueous phase oil-gas. 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. The mudstone cap rock of Qingshan formation and the member 1 and member 2 of Nenjiang formation of Lower Cretaceous Series in Sanzhao sag of Songliao Basin are undercompgntion and its pore fluid is of 15 Mad or 10 MPa abnormal high Pressure. The mudstone cap rock has the same pressure seal capability as capillary seal,which plays a very important role in oil-gas accumulation and preservation in the area.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
1995年第3期12-15,共4页
Natural Gas Industry
关键词
封闭压力
毛细管压力
油气聚集
早白垩世
Confining pasture,capillary pressure,Abnormal pressure,Oil and gss accumulating,Sanzhao sag,Early Cretuceous Epoch.
