Phase equilibria modelling applied to fluid inclusions: Liquid-vapour equilibria and calculation of the molar volume in the CO 2 ---CH 4 ---N 2 system

Details Phase equilibria modelling applied to fluid inclusions: Liquid-vapour equilibria and calculation of the molar volume in the CO 2 ---CH 4 ---N 2 system Phase equilibria modelling applied to fluid inclusions: Liquid-vapour equilibria and calculation of the molar volume in the CO 2 ---CH 4 ---N 2 system

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.1073t&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 58, Issue 3, pp.1073-1082

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Quantitative use of fluid inclusions requires the determination of composition and molar volume. The molar volume can be calculated in the CO 2 ---CH 4 ---N 2 system from both the determination of the temperature of a L + V L ( or V ) equilibrium if the composition is known independently, provided an equation of state (EOS) reproduces the P - V - T - X properties of each phase at equilibrium. This study is applicable to fluids for which the sequence of phase transition is S co 2 + L + V L + V L ( or V ) at increasing temperature. The molar volume is determined by following a two-step algorithm: 1. (1) the pressure is calculated from a two-parameter cubic EOS with interaction parameters optimised along experimental L - V isotherms; 2. (2) the molar volume is then calculated by the correlation of and (1975) with the pressure calculated in the first step. Projections of polybaric L - V isotherms in v - x diagrams of the CO 2 ---CH 4 , CO 2 ---N 2 , and CH 4 ---N 2 systems can be directly applied to fluid inclusion studies. In addition, it is shown that the molar volume of CO 2 -rich fluids ( X co 2 > 0.6) in the ternary system can be estimated with sufficient accuracy using empirical formulae relating to the v - x diagrams of the CO 2 ---CH 4 and CO 2 ---N 2 binary systems.

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