Abstract: The work is carried out in marine sedimentary shale gas reservoirs in Sichuan Basin. Based on core analysis, comprehensively combining with drilling, logging, geology, gas testing and core data, an evaluation model which takes organic carbon content (TOC), porosity (POR), gas content (GAS), brittleness index (BI), fracture pressure (PF) as key parameters of shale gas reservoirs is established. This paper preferentially takes TOC, POR, GAS and BI as parameters, establishing different log interpretation standards in different blocks, suggesting some principles of optimizing preferred perforating and fracturing layers of horizontal wells in shale gas reservoir. The model is applied in thirty wells of two national shale gas demonstration zones in Sichuan Basin. The results turned out that the maximum relative error of shale gas reservoir′s key parameters is 7.6% and the accuracy of shale gas reservoir logging identification is 95.0%. This suggests the model strongly promotes the exploration and development of shale gas in southern China.