STUDY OF CONTROL MECHANISM OF OIL AND GAS BY THE TRANSFER ZONE IN THE GAOYOU SAG OF THE NORTH JIANGSU BASIN

Transfer zone is a kind of adjusted structure to keep the conservation of deformation during the evolution of rift-basin.It exists in extensional tectonic system as well as in strike-slip tectonic system.The transfer zone in each system has different control mechanism of oil and gas.The transfer faults in extensional tectonic system have better seal capacity than that in strike-slip tectonic system.So it requires heavy-mud contents in corresponding wall to form a pool for a transfer fault related to strike-slip tectonic system.The paper has applied the theory of transfer zone to study the reasons of success and failure of exploration in the Zhenwu and the Wubao fault zone of the Gaoyou Sag,and concludes that Xuzhuang area has better seal capacity for developing extensional tectonic system than that in Chenbao area for developing strikeslip tectonic system.It helps to reveal the essence of hydrocarbon accumulation mechanism in the given area.All in all,the theory of transfer zone can greatly promote the further exploration and development of the area,and also can promote to choose advantageous traps of exploration.