Modeling and measurement of CO2 solubility in salty aqueous solutions and application in the Erdos Basin

摘要: Abstract Geological carbon storage (GCS) is recognized as an effective method for mitigating the greenhouse effect. Deep saline aquifers hold highest potential capacity CO 2 storage. solubility in salty aqueous solutions under geological sequestration conditions plays a key role GCS. However, most studies focus mainly on single-salt (NaCl and CaCl ), extrapolation of these to with mixed ions unavailable. To fill research gap, based collection data, semi-empirical thermodynamic model proposed this paper calculate containing K + , Na Ca 2+ Mg temperature pressure ranges from 313 K 378 K 50 bar 220 bar. describe –liquid phase equilibrium, Peng–Robinson equation state (PR EoS) Setschenov are applied. The former has been modified improve its performance studied T – P range, latter shows excellent accuracy only three optimized parameters. Before modeling was done, experimental were conducted. Brine sampling five reservoirs potentially chosen Erdos Basin carried out using monitoring well support Shenhua Group capture (CCS) site project. chemical composition samples determined, experiments measuring synthetic brine 64 valid data points reported. An analytical simplified technique chosen. In range studied, average absolute deviation between results 2.01%, maximum study less than 4.79%. therefore possess broad adaptability GCS satisfactory accuracy.