The evaluation of the dynamic characteristics of carbonate karst reservoir seepage is extremely important for the efficient development of gas reservoirs. The combination of pores, karst caves, and fractures in the fourth member of the Dengying Formation of the Gaoshiti to Moxi Sinian in the Sichuan Basin is complex, with strong heterogeneity. The well test curves have diverse shapes, and accurate identification and division of pressure transient characteristics under different geological units can help to have a clearer understanding of gas reservoir characteristics. This article is based on different geological units and uses numerical well testing combined with static and dynamic data to study the pressure transient characteristics under different reservoir modes, clarifying the seepage characteristics of different reservoir development modes. Research has shown that: ① The well testing curve characteristics of the Sinian Dengying Formation gas reservoir in the Gaomo area can be divided into four categories: homogeneous fracture development type, matrix pore type, locally weakly developed fracture and cave type, and locally strongly developed fracture and cave type; ② The high-quality reservoirs in the Moxi block are mainly dominated by karst controlled by faults, with multiple wells exhibiting bilinear flow characteristics. The high-quality reservoirs in the Gaoshiti block are mainly characterized by the development of pores, which are characterized by long duration and good physical properties of planar radial flow. Overall, the pore permeability distribution in the Gaoshiti block of the Moxi block is more uniform ③ Dynamic data can be used to further modify the reservoir combination patterns in different regions, thereby identifying more accurate geological units and evaluating the high and stable production capacity of gas wells. Provide technical references for the zoning and layered development of similar gas reservoirs, and improve reservoir physical property prediction.