1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. Jilin Institute of Geological Survey, Changchun 130051, China

Volcanic gas reservoir is the important deep gas reservoir type of Changling fault depression in Songliao Basin. Based on the drilling core, SEM, porosity-permeability test and the analysis of plane porosity, the authors studied the types and characteristics of volcanic rock reservoirs, depicted the spatial distribution characteristics of volcanic rock reservoirs and gas accumulation by seismic data and production data, and explored the controlling effects of different volcanic rock reservoirs on gas accumulation. The results show that the study area mainly developed three types of volcanic rock reservoirs:porous rhyolite, rhyolitic tuff lava and blocky rhyolite reservoirs. The porous rhyolite reservoir is mainly with primary porosity and micro fractures, belonging to higher-highest porosity and low-higher permeability reservoir. The rhyolite tuff lava reservoir mainly developed devitrified pore and structural fractures, belonging to medium porosity and very low permeability reservoir. The blocky rhyolite reservoir mainly developed fractures, belonging to very low porosity and very low permeability reservoir. The porous rhyolite reservoir is characterized by superposition of commercial gas reservoirs vertically and horizontally, forming large reservoir with high production rate. The rhyolite tuff lava reservoir is blocky gas reservoir with moderate gas production. The rhyolite reservoir has blocky gas reservoir and lower production rate, and can only reach commercial production after fracturing.