2 . the variation of formation compression during subsidence during the subsidence there are hydrostatic pressure and abnormal pressure zones in vertical 2盆地沉降过程中地层压力的变化盆地沉降过程中,地层压力在垂向上大致分为静水压力带和异常超压带。
It is possible to form abnormal pressure in the fleet stratum because the fluid of sandstone can not be expelled effectively in the sandstone lens closed down by mudstone 在被泥岩封闭的砂岩透镜体中,砂岩中的流体无法有效排出,导致在较浅的深度就可能产生异常超压。
Abnormal pressure is also formed in the thickness mudstone because the permeability of mudstone meet with sandstone decrease sharply which make the inner fluid not be expelled effectively 厚层泥岩中,与砂岩接触部位的泥岩的渗透率急剧降低,使内部的流体无法有效排出,形成异常超压。
Although there is not steadily distributed thicker shaly rock in the deep part of songliao basin , we believe that the deep part is better than shallower part when considering the geologic conditions of forming abnormal pressure 松辽盆地深层虽然没有稳定分布的较厚泥岩层,但从形成压力异常的地质条件看,深层要优于浅层。
According to oil - gas accumulation mechanism under abnormal pressure , the hydrocarbon accumulation phases are classified , and the elects of the abnormal overpressure on reservoir type awl distribution are analyzed 依据异常压力成效机制对柴西南油气成藏阶段进行了划分,并分析了异常压力对油气藏类型和油气藏分布的控制作用。