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Utilizing core logging��grain size analysis and thin section analysis��the authors identified front delta as the major sub-facies type of Chang 6 oil-bearing formation��including the microfacies of subaqueous distributary channel��river mouth bar��subaqueous interdistributary bay��subaqueous crevasse splay��and subaqueous natural levee�� The planar distribution regulation of each layer and the control action of sedimentary microfacies to reservoirs have been analyzed��which show that the high quality reservoirs of Chang 6 oil-bearing formation were mainly hosted in subaqueous distributary channel sand and combination sand between subaqueous distributary channel and mouth bar�� In general��the high quality reservoirs of Chang 621 ��Chang 612 and Chang 622 were wider distributed with better continuity in plane and superimposition in vertical��which are the target layers for the next work��