GEOPHYSICAL RESEARCH, 2016, vol.17, no.4, pp.37-46. DOI: 10.21455/gr2016.4-3

Abstract  References  Full text (in Russian)


E.I. Suetnova

Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia

Abstract. The presented mathematical model is developed as a theoretical basis of the mechanism of gas hydrate accumulation in vicinity of marine mud volcano. The model accounts for gas hydrate forming in the PT stability zone due to filtration of gas saturated pore fluid in the vicinity of mud volcano above high pressure mud source layer. The model calculations show that hydrate accumulation rate depends on hydrodynamic properties of sediments above mud source layer, their porosity, thermal gradient, and physical properties. Also hydrate accumulation rate depends on the depth of the source layer and the pressure inside it. It is shown that a time to reach the steady state filtration depends on the same parameters.

In frames of the model, the influence of permeability and mud source depth on the accumulation rate was analyzed. The calculations show that the maximum rate of gas hydrate accumulation is 2.6 % of the porous space during 100 years with permeability equal to k=10–14 m2, temperature gradient 0.05⁰Km–1, mud source depth 1000 m, and sea depth 1200 m. Such a high hydrate accumulation rate during centuries can provide significant gas hydrate saturation in vicinity of mud volcano, which is consistent with experimental data.

The process of gas hydrate accumulation associated with mud volcanoes is qualitatively characterized. The dependence of maximum rate of accumulation on the filtration characteristics of sediments and geophysical parameters of medium is obtained. It can be applied to model the gas hydrate saturation in vicinity of mud volcanoes  during a time period between eruptions.

Keywords: gas hydrate, mud volcano, mathematical and numerical modeling.



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