Method and device for determining pore throat radius based on nuclear magnetic resonance T2 spectrum curve

The invention provides a method and a device for determining a pore throat radius based on a nuclear magnetic resonance T2 spectrum curve. The method comprises the following steps: acquiring physical property data and a first nuclear magnetic resonance T2 spectrum curve of a rock sample to be detected; inputting the physical property data into a statistical relationship model to obtain a first conversion multiplier, the statistical relationship model being obtained by training according to a second conversion multiplier of the training rock sample and the physical property data, the second conversion multiplier represents a conversion relation between relaxation time in a second nuclear magnetic resonance T2 spectrum curve of the training rock sample and capillary pressure in a high-pressure mercury injection curve; and determining the pore throat radius distribution of the rock sample to be measured according to the first conversion multiplier and the first nuclear magnetic resonance T2 spectrum curve. The c