| Citation: | GAO Qirong，LEI Hongwu，CAI Yuna，et al. In situ pH measurement and prediction modelling of the impure CO2-water system under high-temperature and high-pressure conditions[J]. Bulletin of Geological Science and Technology，2025，44（4）：116-128 doi: 10.19509/j.cnki.dzkq.tb20240421
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The dissolution of CO2-containing gases into deep aquifers results in the formation of carbonic acid, which lowers the pH value of the aquifer and may cause the dissolution or precipitation of minerals, thereby affecting the safety and effectiveness of CO2 geological utilization and storage.
pH is a key parameter for characterizing the chemical properties of a solution. Experimental measurement and model prediction of the pH values of pure and impure CO2-saturated systems can be used to evaluate the chemical changes under CO2 geological storage conditions.
In this study, the pH values of pure and impure CO2-water systems were measured in situ using potentiometric and spectroscopic methods, under temperatures conditions ranging from 35 to 93℃ and pressure condictions raging from 0.38 to 18 MPa. A component chemical equilibrium model calibrated using solubility data, was developed to calculate and predict the pH values of pure and impure CO2-water systems.
The results show that that N2 and CH4 influence the CO2-saturated systems by reducing CO2 solubility in water and increasing the pH value, with CH4 having a greater effect than N2. The model can accurately predict the pH values of pure CO2-water systems, with a maximum deviation within 0.05 pH units. In impure CO2-water systems, deviations are mainly observed under the condition of 50℃ and a CO2-to-impurity gas ratio of 1∶9, with deviations within 0.15 pH units.
The potentiometric and spectroscopic methods are applicable for in situ pH measurements under high-temperature and high-pressure conditions, and the pH prediction model for pure and impure CO2-water systems shows good accuracy. The findings provide theoretical support for understanding the chemical changes induced by the injection of impure CO2 into geological formations, which is of great significance for enhancing the safety and effectiveness of carbon storage.
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