The influence of temperature, pressure, salinity and capillary force on the formation of methane hydrate

We present here a thermodynamic model for predicting multi-phase equilibrium of methane hydrate liquid and vapor phases under conditions of different temperature, pressure, salinity and pore sizes. The model is based on the 1959 van der Waals–Platteeuw model, angle-dependent ab initio intermolecular...

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Bibliographic Details
Published in:Geoscience Frontiers
Main Authors: Zhenhao Duan, Ding Li, Yali Chen, Rui Sun
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier 2011
Subjects:
Methane hydrate
ab initio potential
Salinity
Porous sediment
Forming conditions
Phase equilibria
Geology
QE1-996.5
Online Access:https://doi.org/10.1016/j.gsf.2011.03.009
https://doaj.org/article/4a8a134545b1449a9620a543688c7349
Description
Summary:We present here a thermodynamic model for predicting multi-phase equilibrium of methane hydrate liquid and vapor phases under conditions of different temperature, pressure, salinity and pore sizes. The model is based on the 1959 van der Waals–Platteeuw model, angle-dependent ab initio intermolecular potentials, the DMW-92 equation of state and Pitzer theory. Comparison with all available experimental data shows that this model can accurately predict the effects of temperature, pressure, salinity and capillary radius on the formation and dissociation of methane hydrate. Online calculations of the p–T conditions for the formation of methane hydrate at given salinities and pore sizes of sediments are available on: www.geochem-model.org/models.htm.

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