Method for jointly characterizing pore size distribution of pore fluids with different mobility in tight reservoir

The invention relates to a method for jointly characterizing pore size distribution of pore fluids with different mobility in a tight reservoir. The method comprises the following steps: obtaining a tight reservoir rock sample; obtaining a T2 spectrum under salt water saturation and a T2 spectrum under each centrifugal force by using a nuclear magnetic resonance experiment; obtaining a T2 cut-off value of the movable fluid of the tight reservoir; calculating the saturation of the movable fluid and the saturation of the bound fluid; combining high-pressure mercury injection and N2 adsorption experiments to obtain a full-aperture pore volume frequency distribution curve and an accumulated pore volume frequency distribution curve; calibrating the T2 spectrum under salt water saturation by using the full-aperture cumulative pore volume frequency distribution curve to obtain a full-aperture T2 spectrum aperture distribution curve; according to the T2 cutoff value of the movable fluid, the lower limit value of the