Abstract：As one of the main oil-rich depressions in the Hailar Basin, Beier Depression has experienced “three periods of filling and three periods of transformation”, with complex geological structures. It is of great significance to study the controlling effects of tectonic evolution on source rocks. Therefore, after studying tectonic evolution cha-racteristics, this paper analyzes the evolution of sedimentary centers in different evolution stages and clarifies the distribution range of mature source rocks. The results show that the distribution of source rocks in the Nantun Formation is controlled by three rows of sedimentary centers developed in the fault depression stage of the Beier Depression. The rapid basin subsidence in the fault depression stage promotes the maturation of source rocks. The source rocks of the Nantun Formation in the middle and north of the Beixi subsag, and the Beizhong subsag have been in the mature stage of hydrocarbon generation, which makes them the main hydrocarbon generation subsags in Beier Depression. The results can provide a basis for the further exploration of oil and gas in the Beier Depression.
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