Abstract: Commercial gas stream bas been discovered in the Jurassic volcanic rocks of the Yingshan Fault Depression.Deep volcanic rocks then become another target stratum for hydrocarbon exploration in the Songliao Basin.To predict the distribution of volcanic rocks by seismic information is an only effective way to find out gas reservoirs in volcanic rocks when with few drilling wells.By use of seismic data and combined with the geology of drilling wells,the distribution of volcanic rocks can be studied.The distributive range and thickness of volcanic rocks can be predicted by their seismic reflection features,and the distributive law can be analysed by strata whose geology is revealed through well drilling.Therefore the formation and distribution of volcanic rocks can be understood.This has very important significance for the gas reservoir research of the Jurassic volcanic rocks in the Yingshan Fault Depression of the Songliao Basin.