Method for evaluating development effect of low-permeability tight sandstone gas reservoir

The invention discloses a low-permeability tight sandstone gas reservoir development effect evaluation method. The method comprises the steps that S1, target gas reservoir types are divided according to stratum parameters; s2, establishing a gas-water relative permeability curve according to the type division condition of the gas reservoir; s3, respectively calculating wasteland layer pressure under different water saturations for various gas reservoir types; s4, calculating the function relationship between the yield and the formation pressure in the exploitation process of various gas reservoir types by adopting a material balance method; and S5, establishing a gas reservoir development effect evaluation chart. Aiming at the constant volume sealing characteristic that no external energy is supplemented in the development process of the low-permeability tight sandstone gas reservoir and the characteristic that the underground pore volume of reservoir rock is conservative, a gas-water two-phase seepage low-pe