A THERMODYNAMIC MODEL FOR CALCULATING METHANE SOLUBILITY, DENSITY AND GAS PHASE COMPOSITION OF METHANE-BEARING AQUEOUS FLUIDS FROM 273 TO 523 K AND FROM 1 TO 2000 BAR
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dc.contributor.author | Duan Z. | |
dc.contributor.author | Mao S. | |
dc.date.accessioned | 2024-05-05T03:46:11Z | |
dc.date.available | 2024-05-05T03:46:11Z | |
dc.date.issued | 2006 | |
dc.identifier | https://elibrary.ru/item.asp?id=12091769 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2006, 70, 13, 3369-3386 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/43814 | |
dc.description.abstract | A thermodynamic model is presented to calculate methane solubility, liquid phase density and gas phase composition of the H2O-CH4 and H2O-CH4-NaCl systems from 273 to 523 K (possibly up to 573 K), from 1 to 2000 bar and from 0 to 6 mol kg-1 of NaCl with experimental accuracy. By a more strict theoretical approach and using updated experimental data, this model made substantial improvements over previous models: (1) the accuracy of methane solubility in pure water in the temperature range between 273 and 283 K is increased from about 10% to about 5%, but confirms the accuracy of the Duan model [Duan Z., Moller N., Weare J.H., 1992a. Prediction of methane solubilities in natural waters to high ionic strength from 0 to 250 °C and from 0 to 1600 bar. Geochim. Cosmochim. Acta 56, 1451-1460] above 283 K up to 2000 bar; (2) the accuracy of methane solubility in the NaCl aqueous solutions is increased from >12% to about 6% on average from 273 K and 1 bar to 523 K and 2000 bar; (3) this model is able to calculate water content in the gas phase and liquid phase density, which cannot be calculated by previous models; and (4) it covers a wider range of temperature and pressure space. With a simple approach, this model is extended to predict CH4 solubility in other aqueous salt solutions containing Na+, K+, Mg2+, Ca2+, Cl- and SO42 -, such as seawater and geothermal brines, with excellent accuracy. This model is also able to calculate homogenization pressure of fluid inclusions (CH4-H2O-NaCl) and CH4 solubility in water at gas-liquid-hydrate phase equilibrium. A computer code is developed for this model and can be downloaded from the website: www.geochem-model.org/programs.htm. ? 2006 Elsevier Inc. All rights reserved. | |
dc.subject | CHEMICAL COMPOSITION | |
dc.subject | DENSITY | |
dc.subject | METHANE | |
dc.subject | SOLUBILITY | |
dc.subject | THERMODYNAMICS | |
dc.title | A THERMODYNAMIC MODEL FOR CALCULATING METHANE SOLUBILITY, DENSITY AND GAS PHASE COMPOSITION OF METHANE-BEARING AQUEOUS FLUIDS FROM 273 TO 523 K AND FROM 1 TO 2000 BAR | |
dc.type | Статья | |
dc.identifier.doi | 10.1016/j.gca.2006.03.018 |
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