Abstract: Abstract:The hydrocarbon in shallow groups including Zhuhai Formation,Zhujiang Formation,Hanjiang Formation in Zhu I Depression of Pearl River Mouth Basin mainly come from deeply buried source rock. The fault is oil source passage and plays an essential role in the formation and distribution of oil and gas reservoirs. In order to understand the control of faults on hydrocarbon accumulation in the Zhuhai Formation to Hanjiang Formation in Zhu I Depression of Pearl River Mouth Basin, fault distribution and anatomy of fault zone are studied. On the base of fault activity period and layer position broken by fault, different faults can be divided into five categories: early activity which cut deep, advanced activity which cut the shallow stratum, late activity which cut through deep and shallow strata, succession activity which cut through deep and shallow strata, bable type of fault. Based on the anatomy of the fault zone south of Enping, it is found fault controlling factors mainly include fault type, fault event rate, the size of the fault,and distance from the traps to fault. For the regions found reservoirs, the above factors are analyzed. The results show that: the fault that cut through deep and shallow strata controls hydrocarbon accumulation significantly. As the rate of fault activity is moderate, it is most favorable for hydrocarbon accumulation, which reach a maximum at 15 m/Ma; the larger the size of the fault is, the more favorable for hydrocarbon accumulation is; the closer the trap to the fault is, the better for reservoir hydrocarbon potential is. According to activity rate, fault scale and relative distance between trap and fault, an quantitative characterization of Tibetan formula is found out. It is found 978% of the current found oil and gas reservoirs are located in the probability of fracture controlled Tibetan region of 05. Southeastern Huidong low uplift and the north halfgraben, Enping in the northeastern part of the halfgraben are favorable areas of fracturecontrolled zone.

Key words: Pearl River Mouth Basin, Zhu I depression, faultcontrolling reservoir, probability of reservoir controlling, play fairway prediction