济阳断陷盆地油气运移优势方向研究

济阳断陷盆地不同区带油气运移的控制因素、输导体系和运聚方向各异。洼陷带深部,油气沿“应压双控”作用产生的裂缝系统———隐蔽输导体系侧向或向上充注于泥岩裂缝圈闭或砂岩透镜体,油气运移的优势方向与成藏期北东向最大水平主应力方向一致;洼陷带上部或两侧,油气通过断裂型输导体系向上运移,平面上亦平行于北东向断裂运移;陡坡带和缓坡带,油气输导体系主要为断裂-砂体复合型,油气运移优势方向为垂直于盆地边缘边界断层的鼻状构造带的展布方向。

A study on dominant directions of hydrocarbon migration in Jiyang rifted-basin

In Jiyang rifted-basin,there are different factors to control hydrocarbon migration,carrier systems and migration-accumulation directions in various zones.For the lower part of sag zone,(hydrocarbon) could be charged laterally or upward into fractured mudstone traps or sandstone lenses through a fracture-subtle carrier system produced by "dual controlling of stress and pressure",and the dominant direction of hydrocarbon migration was parallel to the NE direction of horizontal principal stress during hydrocarbon accumulation.For the upper part of sag zone or its two sides,(hydrocarbon) could migrate through a fault-type carrier system,in which the areal migration direction was also parallel to the NE-trending faults.For the(abrupt) slope and ramp zones,there was a carrier system dominated by fault-sand body combination,and the dominant direction of migration was along the nose trend vertical to the basin boundary fault.