According to the seismic section, we have divided Beier depression with the recovery method of balance section, ie 4 forming stages: fault depression stage (Tongbomiao Formation, sag stage (Damoguaihe Formation, Yimin Formation) ; sinking stage ( Qingyuangang stage (Cenozoic) 4 reforming stages: tension -torsion deformation stage of end period Nantun Formation) ; fault Formation) and shrinkage of Nantun Formation Mem- ber 1 and Member 2 Sedimentation ; tension - torsion deformation stage of end period of Yimin Formation sedimen- tation and reversal deformation stage of end period of Qingyuangang Formation sedimentation.
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