Shale gas reservoir is an “artificial reservoir” with complex flow mechanism and many factors affecting well productivity. The key to develop the shale gas field in a scientific and efficient way is to determine the factors influencing gas well productivity and further establish productivity evaluation model. Based on the geological background and fracturing effect of shale wells in the Jiaoshiba Block

Fuling Gas Field

the factors influencing the productivity of multi-stage fractured horizontal shale gas wells are systematically analyzed. Then

the radar chart and fuzzy analytic hierarchy process （FAHP） are used to analyze the eight main factors affecting the productivity. Results show that there are obvious differences in terms of the degree various factors influencing on well productivity in different regions. Specifically

since the reservoir physical properties in the northern of the main area and western areas are favorable

the horizontal section parameters and fracturing scale are the main control factors of gas well productivity; the productivity of gas wells in the eastern area is highly related to the preservation conditions; due to the increase of buried depth in the south of the main area

the compressibility parameters and fracturing scale jointly determine the gas well productivity. In contrast

the compressibility parameters of gas wells in the southwest of the Jiaoshiba are the controlling factor. In this paper

fuzzy analytic hierarchy process （FAHP） is applied to determine the weight of various factors affecting productivity in different areas

and then a comprehensive productivity evaluation model suitable for shale gas wells is established. The results of numerical simulation and practical application show that the gas well productivity predicted by fuzzy comprehensive evaluation model is applicable to the infill wells in the Jiaoshiba Block

and the model is effective to analyze and predict the productivity and development effect of shale gas well.