http://www.sciencedirect.com/science/article/pii/S1674987111000272

We present here a thermodynamic model for predicting multi-phase equilibrium of methanehydrate liquid and vapor phases under conditions of different temperature, pressure, salinity and poresizes. The model is based on the 1959 van der WaalsePlatteeuw model, angle-dependent ab initio intermolecularpotentials, the DMW-92 equation of state and Pitzer theory. Comparison with all availableexperimental 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 calculationsof the peT conditions for the formation of methane hydrate at given salinities and pore sizes of sedimentsare available on: www.geochem-model.org/models.htm.