Abstract: According to core observation, well logging and boring, as well as the development performance data, reservoir sedimentary characteristics and heterogeneity and their effects on the flood development of block Bei 16, Xing’anling Group in Sudeerte oilfield were comprehensively studied. The results show that the Xing’anling Group was developed in a fan delta front in a depositional setting of coastal and shallow lake. And the physical properties of the reservoir consisting of non-equal grain size sandstones and gritstones in submerged branch channel are the best, of medium-grained sandstones in mouth bar are secondary, and of siltstones in distal bar are the worst. The heterogeneity of Ⅱ oil group is weak, but the heterogeneity of the other groups is strong. Then different development measures should be adopted based on the distribution characteristics of the sedimentary micro-facies and their differences in reservoir heterogeneity.

Key words: Sudeerte oilfield, Xing’anling Group, reservoir sedimentary characteristics, heterogeneity