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

• 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

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.