郯庐中段走滑断裂与新滩地区油气成藏关系

郯庐断裂带是一条北东向主干断裂带,是地壳断块差异运动的接合带。该断裂带经历了多期构造运动,不仅是一条以剪切运动为主的深断裂带,而且是一条继承着新构造运动方式、以左旋逆推为主的走滑活动断裂带。郯庐断裂带幕次性活动,控制走滑断裂带的发育和空间展布,而走滑断裂又是油气运移、聚集、成藏的场所。新滩地区处于郯庐断裂带中断,发育多条北北东和北东向雁行式走滑断裂。北北东方向的主走滑断裂主要沟通油源,是油气垂直运移的优势通道;而北东方向的派生断裂改变油气运移方向,影响油气的二次运移分配,即,主断裂控制油气运移层位及赋存深度,派生断裂控制油气平面分布及延伸距离。油气主要在走滑断裂带附近聚集成藏,形成构造、构造—岩性油气藏。 

Relationship between Middle Tanlu Strike Slip Fault Belt and oil-and-gas accumulation in Xintan area

Tanlu fault belt is a NE oriented main fault belt where different crustal blocks meet.The belt has experienced stages of tectonic movements.It is not only a deep fault mainly controlled by shearing movements,but also an active slip fault rotating left-hand and successing a new way of structure movement.Stages of movements of Tanlu fault belt have controlled development and distribution strike-slip fault belt,where hydrocarbon migrates and accumulates.Xintan locates in the middle of Tanlu fault belt.Some NNE and NE oriented flying-geese-style strike-slip faults generate.The NNE oriented main strike-slip faults lead to oil source and are favorable paths for vertical migration.The NE oriented induced faults change hydrocarbon migration direction and influence secondary migration.In other words,main faults control migration path and depth,and induced faults control plane distribution and extension distance.Hydrocarbon mainly accumulates along strike-slip faults and forms tectonic-lithologic reservoirs.