Based on the research of the organic inclusions in the Sinian Dengying carbonate reservoir of the Weiyuan gas field, it is sure that there are a great number of organic inclusions in filled minerals of three stages in pores, holes and fractures in the reservoir. It is thought that the pores, holes and fractures in the reservoir are chief channels of migration and accumulation of oil and gas. According to the characteristics and homogenization temperatures of the organic inclusions and gas composition of individual organic inclusions, the paper analyzes the oil-gas evolution history, stages, depth and temperature of oil-gas migration and accumulation. Result shows that there are three stages of oil-gas migration and accumulation in the Weiyuan gas field. They are different in evolution history, and depth and temperature of oil-gas migration and accumulation.