Abstract: The deep zone of Songliao basin is made up of a group of separated fault depressions. The volcanic rocks are the major reservoirs for deep gas exploration. Based on systematically analyses of the formation condition and the gas accumulation pattern, it is suggested that the deep volcanic gas reservoirs are characterized by the short distant migration, distribution around main trough and along the fault, and controlled by source rocks, reservoirs and faults. The areas with both developed source rocks and volcanic reservoirs are the favorable exploration zones. For exploration prospect, there are many fault depressions that have not yet made a breakthrough, such as Yingcheng formation and Huoshiling formation which are all exploration targets with potentials. The widespread deep clastic rocks where the source rocks directly connected with reservoirs in large area could be as important succeeding zones for deep exploration in this basin