<p>To characterize the microcomponents and pore structure of high-rank coals under supercritical CO₂ (SC-CO₂) pulsation, the effects of SC-CO₂ pulsation on the mineral composition, organic functional groups, pore structure and pore fractal characteristics of high-rank coals were investigated on the basis of a combination of X-ray diffraction (XRD), Fourier transform infrared (FTIR), Mercury intrusion porosimetry, low-temperature liquid nitrogen, and low-field nuclear magnetic resonance experiments. The results showed that after SC-CO₂ pulsation, the mineral compositions and organic functional group contents of the coals changed to different degrees, among which the contents of calcite, ilmenite and illite decreased, the contents of ferro-dolomite and kaolinite increased, and the characteristic peaks of oxygen-containing, benzene-ring-five-substituted H, and aliphatic functional groups decreased. The pore and fractal structure of the coals after SC-CO₂ pulsation significantly altered, the total pore volume of the coal increased by 88%, the percentage of seepage pore volume increased by 13 times, and the porosity increased by 8.272%. The fractal dimensions of the coal samples after SC-CO₂ pulsation all showed a decreasing trend, and the pore structure complexity and surface roughness of the coal samples decreased. This will be highly important for increasing the permeability of coal, sequestering CO₂, and improving the effect of coalbed methane extraction by using SC-CO₂.</p>