Experimental Investigation of Shale Wettability and Its Alteration Mechanisms in Supercritical CO<sub>2</sub>-Brine-Oil Systems: Implications for CO<sub>2</sub> Storage and Enhanced Oil Recovery.

The water-wet Si–OH group content in the shale showed a decreasing trend, while the hydrophobic C–O group content showed an increasing and decreasing trend.

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Under constant temperature conditions, the area of the Si–O absorption peak showed a trend of initially decreasing and then increasing with increasing pressure (turning point at 12 MPa), which was attributed to the formation of new silicate minerals such as Illite in a high concentration of H + environment.

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