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Title: Phase equilibria modeling applied to fluid inclusions: Liquid-vapor equilibria and calculation of the molar volume in the CO[sub 2]-CH[sub 4]-N[sub 2] system

Abstract

Quantitative use of fluid inclusions requires the determination of composition and molar volume. The molar volume can be calculated in the CO[sub 2]-CH[sub 4]N[sub 2] system from both the determination of the temperature of a L + V [yields] 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[sub CO2] + L + V [yields] L + V [yields] L (or V) at increasing temperature. The molar volume is determined by following a two-step algorithm: (1) the pressure is calculated from a two-parameter cubic EOS with interaction parameters optimized along experimental L-V isotherms (2) the molar volume is then calculated by the correlation of LEE and KESLER (1975) with the pressure calculated in the first step. Projections of polybaric L-V isotherms in [upsilon]-X diagrams of the CO[sub 2]-CH[sub 4], CO[sub 2]-N[sub 2], and CH[sub 4]-N[sub 2] systems can be directly applied to fluid inclusion studies. In addition, it is shown that the molar volume of CO[sub 2]-rich fluids (X[sub CO2] > 0.6) in the ternary system can be estimated withmore » sufficient accuracy using empirical formulae relating to the [upsilon]-X diagrams of the CO[sub 2]-CH[sub 4] and CO[sub 2]-N[sub 2] binary systems.« less

Authors:
;  [1];  [2]
  1. Centre de Recherche sur la Geologie des Matieres Minerales et Energetiques, Vandoeuvre-les-Nancy (France)
  2. Laboratoire de thermodynamique, Rueil Malmaison (France)
Publication Date:
OSTI Identifier:
7164911
Resource Type:
Journal Article
Journal Name:
Geochimica et Cosmochimica Acta; (United States)
Additional Journal Information:
Journal Volume: 58:3; Journal ID: ISSN 0016-7037
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 03 NATURAL GAS; 02 PETROLEUM; CARBON DIOXIDE; EQUILIBRIUM; MIXING; PHASE TRANSFORMATIONS; METHANE; NITROGEN; COMPUTERIZED SIMULATION; INCLUSIONS; VOLUME; ALKANES; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; ELEMENTS; HYDROCARBONS; NONMETALS; ORGANIC COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; SIMULATION; 400201* - Chemical & Physicochemical Properties; 030200 - Natural Gas- Reserves, Geology, & Exploration; 020200 - Petroleum- Reserves, Geology, & Exploration

Citation Formats

Thiery, R, Dubessy, J, and Vidal, J. Phase equilibria modeling applied to fluid inclusions: Liquid-vapor equilibria and calculation of the molar volume in the CO[sub 2]-CH[sub 4]-N[sub 2] system. United States: N. p., 1994. Web. doi:10.1016/0016-7037(94)90573-8.
Thiery, R, Dubessy, J, & Vidal, J. Phase equilibria modeling applied to fluid inclusions: Liquid-vapor equilibria and calculation of the molar volume in the CO[sub 2]-CH[sub 4]-N[sub 2] system. United States. https://doi.org/10.1016/0016-7037(94)90573-8
Thiery, R, Dubessy, J, and Vidal, J. 1994. "Phase equilibria modeling applied to fluid inclusions: Liquid-vapor equilibria and calculation of the molar volume in the CO[sub 2]-CH[sub 4]-N[sub 2] system". United States. https://doi.org/10.1016/0016-7037(94)90573-8.
@article{osti_7164911,
title = {Phase equilibria modeling applied to fluid inclusions: Liquid-vapor equilibria and calculation of the molar volume in the CO[sub 2]-CH[sub 4]-N[sub 2] system},
author = {Thiery, R and Dubessy, J and Vidal, J},
abstractNote = {Quantitative use of fluid inclusions requires the determination of composition and molar volume. The molar volume can be calculated in the CO[sub 2]-CH[sub 4]N[sub 2] system from both the determination of the temperature of a L + V [yields] 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[sub CO2] + L + V [yields] L + V [yields] L (or V) at increasing temperature. The molar volume is determined by following a two-step algorithm: (1) the pressure is calculated from a two-parameter cubic EOS with interaction parameters optimized along experimental L-V isotherms (2) the molar volume is then calculated by the correlation of LEE and KESLER (1975) with the pressure calculated in the first step. Projections of polybaric L-V isotherms in [upsilon]-X diagrams of the CO[sub 2]-CH[sub 4], CO[sub 2]-N[sub 2], and CH[sub 4]-N[sub 2] systems can be directly applied to fluid inclusion studies. In addition, it is shown that the molar volume of CO[sub 2]-rich fluids (X[sub CO2] > 0.6) in the ternary system can be estimated with sufficient accuracy using empirical formulae relating to the [upsilon]-X diagrams of the CO[sub 2]-CH[sub 4] and CO[sub 2]-N[sub 2] binary systems.},
doi = {10.1016/0016-7037(94)90573-8},
url = {https://www.osti.gov/biblio/7164911}, journal = {Geochimica et Cosmochimica Acta; (United States)},
issn = {0016-7037},
number = ,
volume = 58:3,
place = {United States},
year = {Tue Feb 01 00:00:00 EST 1994},
month = {Tue Feb 01 00:00:00 EST 1994}
}