Technique and Effect of Lithological Reservoir Prediction in the South of Biyang Depression

In the southern steep slope zone,the lithologic reservoir distribution was not noly controlled by tectonic unit,also controlled by lithologic assemblage,the allocation of source rocks,reservoirs and cap rocks.To identify the space distribution of lithologic reservoirs in Liyuan Area of Biyang Depression and provide accurate drilling targets,the control factors of shale fan growth and genetic mode of lithologic traps were analyzed and studied,sequence stratigraphy,techniques of seismic facies identification,seismic attribute analysis and seismic reverse were used for lithologic reservoir recognition and description on the bases of paleogeomorphic ditch-fan corresponding theory,3Dseismic data.Based on the studied result Wells B304,B315,B321,B325 AND B326 are arranged and thicker oil zones are drilled,newly increased reserves are 851×104t.