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Geological Society, London, Special Publications; 1998; v. 137; p. 75-105;
DOI: 10.1144/GSL.SP.1998.137.01.06
© 1998 Geological Society of London

Analysis and Modelling of Hydrate Formation

Improvements in clathrate modelling II: the H2O-CO2-CH4-N2-C2H6 fluid system

R. J. Bakker

Geologisch-Paläontologisches Institut, Universität Heidelberg, Im Neuenheimer Feld 234, D-69120 Heidelberg, Germany

Clathrate stability conditions have been modelled for the H2O-CO2-CH4-N2-C2H6 fluid system based on all available experimental data. Optimum Kihara parameters are estimated for pure CO2, CH4, N2 and C2H6 gas hydrates from using the most accurate calculation of other parameters involved in clathrate modelling, like fugacities, gas solubilities in H2O and thermodynamic constants. For mixed gas hydrates of CO2-CH4, CH4-N2, and CH4-C2H6 excess Gibbs free energy functions are introduced to obtain a good fit to experimental data. The excess Gibbs free energy is described according a modified Margules equation, which depends on mole fraction and temperature.