摘要
根据松辽盆地断裂纵向导流机理及判别方法,由敖古拉断裂活动期、断穿地层流变性和断裂改造作用确定了其纵向开启性及明水组沉积后期和依安组沉积末期两个主要纵向导流期;提出敖古拉断裂在纵向开启期是油气向西运移的“中转站”,在纵向封闭期其横向封堵性取决于东盘输导层对置地层的输导比。并根据敖古拉断裂西盘地层输导比计算出其静止期横向封堵率达73.4％。由此确定敖古拉断裂阻挡了大部分由齐家—古龙凹陷向西运移的油气。
It is confirmed that Aogula fracture mainly had two phases of vertical oil/gas migration, which occurred respectively during position of upper Mingshui and top Yian formations, and Aogula fracture was the inter-transporting station when oil/gas migration to the western structures during its vertical opening stage. In the vertical sealing phase, its horizontal sealing ability was controlled by the flowing rate of east-wall strata to west-wall strata. It was concluded that horizontal sealing ratio of Aogula fracture was 73.4% during the stable stage, which was calculated from the west-wall strata flowing ratio, and Aogula fracture blocked most of the western-forwarding oil/gas which migrated from Qijia-Gulong depression.
关键词
松辽盆地
敖古拉断裂
封闭
油气运移
Songliao Basin. Aogula fracture, opening, sealing, oil/gas migration
