Based on high vertical resolution of well logging data

we used ΔlgR method to identify the high-quality hydrocarbon source rocks in Wudong slope zone of Hailer Basin and explored its relationship with hydrocarbon accumulation.Research showed that the high-quality hydrocarbon source rocks identified by logging in the vicinity of Wudong reservoir occur in stripped shape in the area from Wu 31 to Wu 108-112 wellblocks in Wu-dong slope zone.The crude oil in this area can be divided into two types.The first type of crude oil correlate well with the high quality source rocks in Wunan subsag in the downdip direction of Wudong reservoir

as they all show obvious characteristics of Ts>Tm and low gammacerane.The second type of crude oil correlate well with the high quality source rocks in Wudong slope zone as they all obviously featured in Ts