Experimental system and experimental method for combined measurement of convection and dispersion of overburden pore permeability nuclides

The invention discloses an experiment system and an experiment method for combined measurement of convection and dispersion of overburden pore permeability nuclides. The experiment system is mainly divided into a penetration diffusion method experiment module and a stratum simulation method experiment module. The penetration diffusion method experiment module drives a solution to form liquid films at the two ends of a rock core through a multi-channel micro peristaltic pump, the dispersion condition is simulated, a collection bottle is replaced regularly, and the diffusion coefficient and the capacity factor are calculated by fitting the nuclide concentration in the collection bottle; the simulated formation method experiment module is used for vacuumizing and saturating a rock core through a vacuum pump, measuring the mass before and after saturation, calculating the porosity, driving a solution to one end of a clamp holder under simulated formation temperature and pressure conditions, and measuring the liqu