In order to identify the exploration prospect of shale gas in Longtan Formation in Zhina area, the mineral composition, organic geochemical characteristics, microscopic pore characteristics, thickness and distribution of bored mud shale and gas content characteristics of Z2 well Longtan Formation were analyzed, and the characteristics of shale gas reservoirs in Longtan Formation were studied and the exploration potential of shale gas was evaluated. The results showed that the organic matter type of shale was type II.2-III., and mainly II.2, the total organic carbon content was 1.34%~8.25%, the average was 3.68%, and the maturity of organic matter was 0.92%~3.24%, with an average of 2.45%, which belonged to the high-high maturity evolution stage and had good vitality potential. The results of scanning electron microscopy showed that the mud shale samples mainly developed four types of microscopic pores, including endogranular science, intergranular pores, organic matter pores and microfractures, and the internal pores were developed, which provided a good storage space for shale gas. The brittle mineral content of mud shale in Z2 well is 24.40%~63.08%, the average is 41.22%, the total thickness of mud shale is 170.74 m, accounting for 42%, and five mud shale layers with effective continuous thickness