关键词: 松辽盆地, 晚侏罗世—早白垩世, 断陷, 构造演化, 油气聚集

Abstract: Songliao Basin underwent active rifting in the Late Jurassic Huoshiling to Early Cretaceous Yingcheng (J₃h-K₁ych),followed by a post-rift phase in the Early Cretaceous Denglouku-Nenjiang(K₁d-K₁n)and a reversion phase in the Late Cretaceous-Cenozoic (K₂-K_z).The Xujiaweizi fault-depression is a representative gas-bearing sub-basin in the lower part of Songliao Basin in the rifting phase.During the rifting phase,the two evolutive phases of Xujiaweizi fault-depression were found:the main faulting period in the Huoshiling-Shahezi (J₃h-K₁sh) along the NW-SE direction,and the asgging period in the Yingcheng (K₁ych).In the end of K₁sh,Xujiaweizi depression reversed.The resource (K₁sh) deposited in the NW extending sub-basin.This discussing is of great benefit to defining the Later Mesozoic stress-field in northeastern China and to finding the new gas-field in the lower part of Songliao Basin.

Key words: Songliao Basin, Late Jurassic-Early Cretaceous, fault-depression, structural evolution, hydrocarbon accumulation