Establishment method of low-permeability reservoir staged fracturing horizontal well seepage model

The invention provides a method for establishing a low-permeability reservoir staged fracturing horizontal well seepage model. Comprising the following steps: step 1, establishing a low-permeability reservoir source function: step 1.1, describing a physical model and assuming conditions; step 1.2, establishing a seepage mathematical model; 1.3, a basic solution of a boundary point source function is closed; 2, a tight oil reservoir staged fracturing horizontal well seepage model is established. The method provided by the invention meets the requirement that the starting pressure gradient and the stress sensitivity effect simultaneously influence the low-permeability reservoir staged fracturing horizontal well seepage model, and overcomes the defect that the traditional method only considers the starting pressure gradient or the stress sensitivity, so that the calculation precision is low; the calculation precision is greatly improved; meanwhile, a theoretical basis is provided for understanding the seepage la