فهرست نشریات علمی دسترسی آزاد ایران

Aqueous phase salinity has a major effect on the quantity of carbon dioxide trapped by solubility trapping and may also affect mineral dissolution and precipitation. While carbon dioxide storage through structural, residual, dissolution and partly mineral trapping modes have a wide investigation, the mineral trapping potential and its influencing factors have not been explored. In this work, the effects of variable aqueous phase salinity on carbon dioxide mineralization were investigated. Numerical simulations were done using a geochemical simulator and three-dimensional homogeneous aquifer model of dimensions 30×30×10 (9000 grid blocks) and block width of 70 m was built. The generated grid was populated with petrophysical, grid and rock properties. Four models with similar rock and fluid characteristics were simulated for pure water and different salinity of 0.01 wt (10000 ppm), 0.015 wt (15000 ppm) and 0.02 wt (20000 ppm) respectively. Result shows a decrease in the moles of carbon dioxide solubilized with an increase in brine salinity level. Increase in brine salinity decreases the moles of carbon dioxide converted to aqueous ions and dissolution in resident brine. There was an increase in the rate of Kaolinite precipitation, Calcite precipitation and a decrease in the rate of Anorthite dissolution with increase in duration of carbon dioxide injection. The mineral mole changes for Anorthite increases with level of salinity and decreases with duration of carbon dioxide injection. Moreover, Calcite and Kaolinite mineral moles changes decreases with level of salinity and with duration of carbon dioxide injection. Calcite and Kaolinite decreases as aqueous phase salinity increases. This work has shown that formation minerals has different reactivity to salinity concentration which decides carbon dioxide trapping and storage capacity.