Abstract: Through fine seismic interpretation,the structural characteristics of Banshen 5-1 block in Dagang oil field were made clear.Combined with regional sedimentary background analysis,the study of reservoir fine inversion and sand body prediction by formation was carried out,which described sand body distribution characteristics of the target block.On the basis of the implementation of the structural characteristics and distribution characteristics of sand bodies,the vertical and horizontal distribution characteristics and reservoir type of oil reservoir were determined.And therefore,based on the research results,the well location deployment was proposed.