The Sichuan Basin harbors vast natural gas resources within its deep carbonate gas reservoirs, exhibiting significant development potential. The fourth section of the Dengying Formation gas reservoir in the Anyue Gas Field, situated in the central Sichuan Basin within the moderate anticline and oblique structural zone, possesses a burial depth of 5200 m, an average reservoir temperature of 150 °C, and an original formation pressure of 56 MPa, classifying it as a deep, high-temperature, high-pressure carbonate gas reservoir. Characterized by its multi-scale storage spaces and high heterogeneity in fracture-cavity reservoirs, horizontal wells have been predominantly employed in the region to enhance development effectiveness. However, conventional testing techniques encounter challenges such as instrument jamming, complex operational processes, high testing costs, and difficulties in achieving long-term and sustained reservoir monitoring. Consequently, dynamic downhole monitoring experiments using slow-release intelligent tracers have been conducted in multiple gas wells within the work area. By analyzing tracer reflux concentrations, variations in gas well production capacity during the production process are discerned. This study, leveraging tracer monitoring technology and long-acting slow-release mechanisms, commences with the screening of slow-release materials encapsulating tracers to further elucidate the suitability of slow-release tracers in high-temperature, high-pressure reservoirs. Through a series of indoor evaluation experiments, the release patterns and diffusion kinetics of slow-release solid tracers under the influence of formation factors are explored, clarifying the relationship between gas well production capacity changes and tracer slow-release patterns. This provides valuable guidance for the selection and dynamic analysis of slow-release tracers in such deep carbonate gas reservoirs.