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.