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The reservoir of Late Cretaceous Yaojia-Nengjiang Formation in Songliao Basin was a large-scale delta complex formed in the transgression and regression period, which had the characteristics of sand body in distributary channel, mouth bar and sheet sand. The sand bodies extended to the lacustrine center and wedged into lacustrine mudstone and mature source rock, and formed a good combination of source, reservoir and cap rock. The large-scale delta complexes developed in the major axis direction of the material source of basin were favorable places for centrally developed oil reservoir, which is an important geological condition for mega continental petroliferous basin. Moreover, the gravity flow channel and slump fan, which are important exploration areas, are also favorable for lithological hydrocarbon reservoir.

Yaojia-Nenjiang Formation Hydrocarbon Accumulation Characteristics in Songliao Basin, Northeastern China