To study the oil and gas distribution law of the fault—caprock configuration in the petroliferous basin.Methods: The sealing evolution stages of fault—caprock configuration was divided;the relationship between the faulted thickness of fault—caprock configuration and time was analyzed,and the maximum faulted thickness required for caprock sealing in the fracture failure was obtained;then the starting period of caprock sealing in the fracture failure was determined. According to the displacement pressure of fault rock and reservoir rock with time,the starting period of fault sealing was determined.Based on this,a set of restoration methods for the sealing evolution stage of fault—caprock configuration was established,and these methods were applied to the restoration of sealing evolution stage at measuring points 4, 6, 9, 10, 11, 12 and 14 in the F5 fault of the Huhenuoren Structure,Beier Sag, Hailaer Basin,and the caprock configuration in the Lower Submember,1st Member,Damoguaihe Formation,Lower Cretaceous(Da-1-L).Results: The results showed that the caprock sealing stage was not developed at measuring points 4, 6, 9, 10, 11, 12 and 14 in the F5 fault and the caprock configuration of the Da-1-L.The unsealing stage was from the late deposition of the Da-1-L to the early deposition of the Qingyuangang Formation,Upper Cretaceous,and the fault sealing stage was from the early deposition of the Qingyuangang Formation to the present.The stratigraphic trap in the study area was in unsealing stage during the hydrocarbon accumulation period,and the beginning of fault sealing was later than the period of oil and gas accumulation (the late deposition of the Yimin Formation,Lower Cretaceous).As a result,it was not conducive to the accumulation and preservation of oil and gas in the Second Member of the Nantun Formation,Lower Cretaceous.Conclusions: The results of the proposed methods are consistent with the current oil and gas distribution in the Second Member of the Nantun Formation,Lower Cretaceous,near the F5 fault,indicating that this method is feasible to restore the sealing evolution stage of fault—caprock configuration.