Most of the production wells in the Sulige Gas Field are commingled production wells, including multi-layer commingling of Lower Paleozoic carbonate reservoirs and commingling of Upper Paleozoic tight sandstone gas reservoirs with Lower Paleozoic carbonate reservoirs, resulting in complex production conditions. Meanwhile, the “single point method” is generally used for initial production testing of gas wells, with short test durations, leading to significant discrepancies between calculated unrestricted flow rates and actual production conditions. In this study, based on the characteristics of multi-layer commingling in the study area, both dynamic and static data were combined. Gas well logging, well testing, gas production profiles, and production dynamic data were applied. A production splitting method based on the theory of sudden change was used to identify the longitudinal distribution characteristics of Lower Paleozoic production. Considering the characteristics of production tubing, a wellbore bottom flow pressure calculation model was selected to calculate the initial production rates and bottomhole pressures of each well, obtaining unrestricted flow rate parameters that are more consistent with actual production conditions. By applying the split production of small layers and new productivity evaluation results, the longitudinal and planar distribution characteristics of productivity and geological influencing factors were identified.