Journal
CHEMICAL GEOLOGY
Volume 347, Issue -, Pages 43-58Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chemgeo.2013.03.010
Keywords
Equation of state; Solubility; CO2-H2O-NaCI; Fluid inclusion; Isochore; Homogenization pressure
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Funding
- National Natural Science Foundation of China [41173072, 90914010]
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To determine compositions, homogenization pressures and isopleths of CO2-H2O-NaCI fluid inclusions, an improved activity-fugacity model is developed to calculate CO2 solubility in aqueous NaCI solutions. The model can predict the CO2 solubility in aqueous NaCl solutions from 273.15 K to 723.15 K, from 1 bar to 1500 bar and from 0 to 4.5 mol kg-1 of NaCI, within or close to experimental uncertainties. Compared to a large number of reliable experimental solubility data available, the average absolute deviation is 4.62% for the CO2 solubility in aqueous NaCl solutions. In the near-critical region, the calculated CO2 solubility deviations increase to over 10%. The CO2 solubility model, together with the updated volumetric model of CO2-H2O-NaCI fluid mixtures, is applied to calculate the CO2 contents, homogenization pressures, molar volumes and volume fractions of the CO2-H2O-NaCI fluid inclusions by an iterative method based on the assumption that the volume of an inclusion keeps constant during heating and cooling. Calculation program code of the CO2 solubility in aqueous NaCI solutions can be obtained from Chemical Geology or the correspondence author (maoshide@163.com). (C) 2013 Elsevier B.V. All rights reserved.
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