Porous medium steady-state seepage flow state discrimination method based on nanometer CT difference frequency scanning

The invention discloses a porous medium steady-state seepage flow state discrimination method based on nanometer CT difference frequency scanning, belongs to the technical field of petroleum and carbon dioxide geological storage scientific research, and comprises a discrimination method composed of a gas-liquid seepage process nanometer CT difference frequency imaging method and an image analysis calculation method. According to the method, the CT image and the nanometer CT imaging time in the steady-state seepage stage are obtained through two times of difference frequency scanning, and data are obtained through calculation by establishing a formula; on the basis of the CT image gray scale, the pore positions where continuous flow and intermittent cutoff occur in the steady-state seepage process can be directly judged, and on the basis of the calculation result of the gas-liquid flowing time in pores, the time scale and the space scale of gas-liquid intermittent cutoff occurring under different pore physical