Abstract: Guided by the theories of sequence stratigraphy, petroleum system, and based on the analysis of structural feature, stratigraphic structure and sedimentary systems of deep layer systems in Biyang sag, through the analysis of developing characteristics of source rocks, reservoir petrology, reservoir performance, porosity development and the features of oil and gas reservoir, the paper analyzed the reservoir formation conditions and distribution rules of oil and gas reservoirs, established reservoir formation patterns. According to distribution features of reservoirs and reservoir characteristics in different structural belts, the paper pointed out several advantages exploration target and put forward some proposals for the next exploration for reference.