Characteristics of faults and their control to hydrocarbon accumulation in the western tectonic zone of Laizhou Bay Sag

Faults were well developed in the western tectonic zone of Laizhou Bay Sag affected by rift of Laizhou Bay Sag in Peleogene period, Tanlu dextral strike-slip fault and large scale rise of Kendong uplift.Two kind of faults including strike-slip fault and extensional faults are identified based on faults nature and developed scale, which affected hydrocarbon migration, accumulation and preservation.Based on hydrocarbon accumulation in Laizhou Bay area and exploration result in other area of Bohai Sea, 3 kind of faults make a good effect to hydrocarbon accumulation in the western tectonic zone including Laibei No.1, reverse normal fault with E-W trending in slope area and echelon faults in the distal end of strike-slip fault.The traps controlled by these 3 kind of faults are the favorable regions in Laizhou Bay Sag and its surrounding areas.