砂岩油藏沉积相带分布及其引发的储层非均质性已经成为制约油藏滚动勘探和开发生产的瓶颈。在系统观察岩心的基础上并结合钻井、测井资料研究了海拉尔盆地苏德尔特油田兴安岭群Ⅰ油层组的沉积微相特征和分布。结果表明，苏德尔特油田兴安岭群Ⅰ油层组主要发育辫状河三角洲前缘水下分流河道、河口坝、远砂坝以及湖底扇主沟道、主沟堤等沉积微相，其中水下分流河道为最主要的沉积微相。在此基础上，剖析了沉积微相与储层物性、油气分布的关系，指出水下分流河道和河口坝微相砂体为该区有利的油气聚集区。

The sedimentary facies distribution of sandstone reservoirs and heterogeneity become the bottle neck restricting the progressive exploration, development and production. According to core observation, well logging and drilling, the sedimentary microfacies and gas/oil distribution inⅠoil formation in Xing’anling Group are studied. The results show there are many sedimentary microfacies inⅠoil formation in Xing’anling Group, such as submerged branch channel, distributary mouth bar, and distal bar in braided river delta front and main groove and embankment in sublacustrine fan, and the submerged branch channel in braided\|river delta front is dominant. The relation among the sedimentary microfacies, the reservoir physical property, and the distribution of oil/gas are analysed, and it is shown that the favorable place for petroleum accumulation is the sandbody to submerged branch channel and distributary mouth bar in braided river delta front.