Based on analyses of the gravity and 3D seismic data of the Beidagang area, the authors recognized a sinistral strike-slip fault (Hong 7-1) in the Beidagang buried hill, the Hong 7-1 occurs as a NW striking curved fault in-between the Dazhangtuo and Gangxi faults. This fault was active in the early and mid-Paleogene, and controlled obviously the Paleogenic sand distribution. Heavy minerals analysis and incised channel tracking show that the NW strike-slip fault in the Beidagang buried hill led to the formation of the incised channels and channel ways for sediment transportation. It can be inferred that the Banqiao and Qibei sags were somewhat controlled by the same provenance system, the Cangxian uplift.