Silurian Kepingtage Ke three sections is an important group of oil layer in Tahe area, based on anatomy of reservoir to the S112-2 Well area, clearing Silurian oil reservoir controlling factors in this area, early reservoir damage and late accumulation coexist, structural-stratigraphic erosion unconformity control reservoir. The results show that stratigraphic erosion unconformity is an important role in divert oil and gas, the formation of secondary porosity.