| Summary: | Supercritical CO<sub>2</sub> can reduce formation fracture pressure, form more complex fractures in the near-well zone, and replace methane to complete carbon sequestration, which is an important direction for the efficient development of deep shale gas with carbon sequestration. In this paper, based on the scCO<sub>2</sub> fracturing field test parameters and the characteristics of common shale calcite filled natural fractures, we simulated the porosity change in shale with three kinds of fractures (no fracture, named NF; axial natural fracture, named AF; and transversal natural fracture, named TF) under scCO<sub>2</sub> seepage, and carried out the experimental verification of shale under supercritical CO<sub>2</sub> seepage. It was found that: (1) At the same pressure, when the temperature is greater than the critical temperature, the shale porosity of three kinds of fractures gradually increases with the injection of CO<sub>2</sub>, and the higher the temperature, the more obvious the increase in porosity. (2) At the same temperature and different pressures, the effect of pressure change on the porosity of shale specimens was more obvious than that of temperature. (3) Multi-field coupling experiments of shale under supercritical CO<sub>2</sub> seepage revealed that the porosity of all three shale specimens at the same temperature and pressure increased after CO<sub>2</sub> injection, and the relative increase in shale porosity measured experimentally was basically consistent with the numerical simulation results. This paper reveals the mechanism of the effect of different temperatures and pressures of scCO<sub>2</sub> and different natural fractures on the change in shale porosity, which can be used to optimize the CO<sub>2</sub> injection in supercritical CO<sub>2</sub> fracturing and carbon sequestration.
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