Effect of $$\hbox {CO}_2$$ CO 2 solubility on dissolution rate of calcite in saline aquifers for temperature range of 50–100 $$^{\circ } \hbox {C}$$ ∘ C and pressures up to 600 bar: alterations of fractures geometry in carbonate rocks by $$\hbox {CO}_2$$ CO 2 -acidified brines