洪泽凹陷管镇次凹断裂发育与油气成藏

Fractural Development in Guanzhen Secondary Depression of Hongze Depression and Its Hydrocarbon Accumulation

管镇次凹的断裂非常发育,这些断裂主要形成于早第三纪,断裂剖面形态以铲式正断层和非旋转平面式正断层为主,断裂剖面组合形态以"Y"字型和多米诺式组合为主。这些断裂以伸展构造样式为主,具体主要有以下3种,分别是与边界铲式正断层相关的断阶,掀斜断块和斜坡上的堑-垒组合。这些断裂对工区内的油气运聚有较大影响。表现为边界断裂对储集相带分布的控制作用、断裂对构造圈闭形成具有控制作用和断裂对油气运移的控制作用;此外,断裂对油气的侧向运移具有封堵作用,促进油气成藏。

Fractures were grown substantially in Guanzhen Secondary Depression,they were formed in early Tertiary system,its sectional styles were mainly shovel-like and non-rotating normal faults,their combination styles were mainly 'Y' type and Domino type.These faults were expending structural types,including 3 types,such as fault step related with boundary shovel-like normal fault,tilt fault block and graben-host block combination of slope.The fractures have significant effects on hydrocarbon migration and accumulation,they also control the formation of traps and hydrocarbon migration,seal the lateral migration of oil and gas and promote the hydrocarbon accumulation.