影响泥岩盖层封闭能力主控因素的物理模拟

为定量研究影响泥岩盖层封闭能力的主控因素,采取物理模拟实验方法,利用不同压实成岩埋深和泥质质量分数的人造泥岩盖层样品,对其排替压力进行测试.结果表明:泥岩盖层排替压力与其泥质质量分数和压实成岩埋深之间具有正比关系,即泥质质量分数越大,压实成岩埋深越大,泥质盖层排替压力越大,封闭能力越强;反之,封闭能力越弱.该关系在大港油田沙一段中部盖层排替压力预测中的成功应用,证明其对预测泥岩盖层封闭能力分布具有指导意义.

Physical simulating of main controlling factor influencing sealing ability of mudstone caprock

To study main controlling factors influencing sealing ability of mudstone caprock,using manmade mudstone caprock sample with different compaction diagenetic depth and mudstone constant,their displacement pressures were measured by physical simulating experiment method.It is considered that displacement pressure of mudstone caprock has direct proportion relation with mudstone content,compaction diagenetic depth,the bigger mudstone content is,the bigger the compaction diagenetic depth is,the bigger displacement pressure of mudstone caprock is,and the stronger sealing ability of mudstone caprock is;on the contrary,the weaker sealing ability of mudstone caprock is.Applying results that the quantitative relation was used to forecast displacement pressure of the Middle of Es1zmudstone caprock in Dagang oilfield indicates that the quantitative relationship is of important significance to forecast sealing ability of mudstone caprock in plane.