Method for nondestructive characterization of pore structure of rock sample, device, medium, and product

A method for nondestructive characterization of a pore structure of a rock sample, comprising:

• preparing a shale sample to be tested;
• conducting a micro-computed tomography (CT) experiment on the shale sample to be tested to extract a first pore volume distribution and a first pore volume percentage of the shale sample to be tested;
• conducting an ultra-small-angle neutron scattering experiment on the shale sample to be tested after the micro-CT experiment to extract a second pore volume distribution and a second pore volume percentage of the shale sample to be tested;
• conducting a small-angle neutron scattering experiment on the shale sample to be tested after the ultra-small-angle neutron scattering experiment to extract a third pore volume distribution and a third pore volume percentage of the shale sample to be tested;
• and
• generating a full-scale pore size distribution curve of the shale sample to be tested based on the first pore volume distribution and the first pore volume percentage, the second pore volume distribution and the second pore volume percentage, and the third pore volume distribution and the third pore volume percentage of the shale sample to be tested.