Mathematical model of hydrate formation from microbial methane in marine sediments |
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Authors: | A V Egorov G G Tsypkin |
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Institution: | (1) Marine Science and Technology, University of Newcastle upon Tyne, Newcastle upon Tyne, NE1 7RU, UK |
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Abstract: | A mathematical model of gas hydrate formation from microbial methane in marine sediments is proposed. An analytical solution
of the problem is obtained, determining dimensionless parameters are distinguished, and numerical investigation is performed.
In the region of main parameters a critical diagram of hydrate existence is plotted. It is shown that at small sediment accumulation
rates microbial methane disperses due to diffusion of dissolved gas which does not reach saturation. If the sediment accumulation
is intense, the region of possible hydrate formation falls within the region of stable thermodynamic states only at large
depths. Correspondingly, in these cases, the probability of formation of hydrate-containing sediment layers is small. The
most probable hydrate formation regime is realized at moderate sediment accumulation rates corresponding to Péclet numbers
of the order of unity. |
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Keywords: | |
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