Evaluation method for multi-section fracturing transformation of shale gas well

The invention discloses an evaluation method for multi-section fracturing transformation of a shale gas well. The evaluation method comprises the following steps: step 1, establishing a fracturing seepage mathematical model by utilizing a point source function based on an injection pressure drop well testing theory; step 2, obtaining a bottom hole pressure response function through Laplace transformation according to the fracturing seepage mathematical model; step 3, obtaining a typical double logarithmic curve through Stehfest numerical inversion; 4, pump stop pressure drop data of fracturing of each section of the shale gas well to be analyzed are obtained, and an actual measurement double logarithmic curve is constructed; and 5, fitting the typical double logarithmic curve and the actually measured double logarithmic curve, determining parameters of the fracturing seepage mathematical model, and obtaining transformation parameters of each fracturing section of the shale gas well to be analyzed. According t