1. College of Earth Sciences��Jilin University��Changchun 130061��China; 2. Key Laboratory for Oil Shale and Coexistent Energy Minerals of Jilin Province of Jilin University��Changchun 130061��China

Seismic��drilling and testing data analyses indicate that the gas reservoir types of Wangfu Fault Depression mainly include the volcanic dome- lithological type��sandstone on the tip off type and lens type�� The volcanic dome inside which has reservoir section together with the source- rock of Huoshiling or Shahezi Formation constituted beneficial source- reservoir- seal assemblage��which is the basis of volcanic dome structural- lithologic gas reservoir�� The finger- like interaction between fan delta updip pinchout lobate sand body of synsedimentary fault boundary and high- quality source rock is essential to the formation of updip pinchout lithologic gas reservoirs�� The source- rock of Shahezi Formation which enveloped the collapsed gravity flow of loose volcanic cone in Huoshiling Formation is the key factor of forming lens- shaped lithologic gas reservoirs�� Furthermore��this paper summarized the gas accumulation mode of Wangfu Fault Depression��and points out that the faulted slope area is the favorable accumulation region of updip pinchout lithologic reservoirs��and the secondary uplift area is superimposed accumu- lation zones of volcanic dome structure- lithologic gas reservoirs of Huoshiling Formation and lens lithologic gas res- ervoirs of Shahezi Formation�� It is the adjacent raised edge zone of the secondary depression groove that tends to form volcanic dome gas reservoirs��