In recent years, condensate gas reservoirs with large resources have been discovered in the central and western regions of China, several condensate gas reservoirs around Shawan sag also show the potential of deep exploration. In this paper, the physical properties and geochemical analysis of crude oil are used, and the empirical statistical method is used to identify the types of oil and gas reservoirs and analyze the phase characteristics and sources of oil and gas. The main understanding is as follows：① There are mainly condensate gas reservoirs with oil ring in the Permian in Shawan Sag. Zhongjia 2- H well is a typical gas condensate well with oil ring. In the study area, there is a secondary condensate gas reservoir formed by the Fengcheng Formation, which is the primary type of hydrocarbon source—fault vertical transport—temperature and pressure control and natural gas invasion；② Combined with P—V—T phase diagram, it is analyzed that the proportion of hydrocarbon C7 + in Permian condensate gas reservoirs in Shawan sag is relatively small. The formation temperature of volatile reservoir is obviously lower than the critical temperature, and the ground saturation pressure difference is small. The critical temperature and critical condensate temperature of formation fluid in black oil reservoir are higher and the critical pressure is lower；③ According to the fact that the gas—oil ratio of condensate gas reservoir in Xinguang well area is higher than that of 13000 m3/m3, and the condensate gas reservoir of Xinguang 1 well belongs to non- oil ring condensate gas reservoir, it can be judged that Xinguang 1 well is a primary condensate gas reservoir. The origin of condensate gas proposed in this article can provide a reference for the next step of oil and gas exploration in the study area, and can also provide methodological support for the research on condensate gas accumulation and resource evaluation in the Junggar Basin.