Method, apparatus, electronic device and medium for determining rock microscopic physical parameters

A method for determining rock microscopic physical parameters, the method comprising:

• acquiring macroscopic physical parameters of a rock, wherein the macroscopic physical parameters includes an apparent volume, a pore volume, a porosity, a permeability and a fluid saturation of the rock;
• acquiring capillary pressure curve experimental data of the rock, wherein the capillary pressure curve experimental data includes a capillary pressure, an accumulated volume of a nonwetting phase fluid, and/or a saturation of a nonwetting phase fluid;
• based on the capillary pressure curve experimental data of the rock, determining an accumulated volume of a nonwetting phase fluid at two end points of different pore radius distribution intervals of the rock, and/or determining a saturation of the nonwetting phase fluid at the two end points of the different pore radius distribution intervals of the rock;
• and
• calculating the rock microscopic physical parameters based on the macroscopic physical parameters of the rock, the accumulated volume of the nonwetting phase fluid at the two end points of the different pore radius distribution intervals of the rock, and/or the saturation of the nonwetting phase fluid at the two end points of the different pore radius distribution intervals of the rock, wherein the microscopic physical parameters includes a microscopic pore volume, a microscopic porosity, a microscopic tortuosity, a microscopic permeability, a microscopic fluid saturation, and/or a microscopic efficiency of mercury withdrawal of the rock, wherein microscopic pores include microscopic pores with saturated nonwetting phase fluid and microscopic pores with minimum unsaturated nonwetting phase fluid, and wherein the calculating of the rock microscopic physical parameters includes dividing the rock into a plurality of microscopic pores.