Dynamic Effect of Carbonated Water on Pore Structure in Shale

Under reservoir conditions (354K, 37MPa), the rock samples were soaked with carbonized water. X-ray diffraction (XRD), scanning electron microscope (SEM), wettability test and permeability test were carried out to analyze the changes of pore structure and connectivity of rock samples with different soaking time. The results of XRD test showed that some minerals dissolved. The results of SEM and permeability tests show that the pore structure of rock samples is a dynamic changing process, and the pore connectivity increases first and then decreases. The wettability test results show that the hydrophilicity of the rock increases with the prolonging of soaking time.