Abstract
This study investigates the influence of supercritical CO2 (scCO2) injection on minerals in high-rank coal under the temperature, pressure, and hydrologic conditions of a deep coalbed. A typical high-rank coal reservoir in the Qinshui basin, the #3 coal seam, is the focus of this research. A coal–scCO2 geochemical reaction experiment is conducted to simulate the 2000 m burial depth of the coal seam. Field emission scanning electron microscopy is used to determine the locations of specific minerals and observe the effects of scCO2–H2O on these minerals at the micrometer scale. These results are combined with X-ray diffraction and inductively coupled plasma-atomic emission spectrometry and mass spectrometry analysis results, and the effects of the scCO2–H2O fluid on minerals in the high-rank coal over a short period are discussed. In addition, the influence on coal reservoir structure was studied based on intrusive mercury and liquid nitrogen adsorption experiment. The results suggest that instantaneous CO2...
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