http://www.sciencedirect.com/science/article/pii/S1674987111000272 |
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Authors: | Zhenhao Duan Ding Li Yali Chen and Rui Sun |
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Institution: | Zhenhao Duan~(a,*),Ding Li~a,Yali Chen~b,Rui Sun~c a Key Laboratory of the Earth's Deep Interior,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China b School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China c Northwest University,Xi'an 710069,China |
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Abstract: | 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 WaalsePlatteeuw 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 peT 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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Keywords: | Methane hydrate ab initio potential Salinity Porous sediment Forming conditions Phase equilibria |
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