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Salt precipitation is generated near the injection well when dry supercritical carbon dioxide (scCO 2 ) is injected into saline aquifers, and it can seriously impair the CO 2 injectivity of the well. We used solid saturation ( ) to map CO 2 injectivity. was used as the response variable for the sensitivity analysis, and the input variables included the CO 2 injection rate ( CO 2 ), salinity of the aquifer ( NaCl ), empirical parameter , air entry pressure ( 0 ), maximum capillary pressure ( max ), and liquid residual saturation ( plr and clr ). Global sensitivity analysis methods, namely, the Morris method and Sobol method, were used. A significant increase in was observed near the injection well, and the results of the two methods were similar: NaCl had the greatest effect on ; the effect of 0 and max on was negligible. On the other hand, with these two methods, CO 2 had various effects on : CO 2 had a large effect on in the Morris method, but it had little effect on in the Sobol method. We also found that a low CO 2 had a profound effect on but that a high CO 2 had almost no effect on the value.

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