Abstract
Experimental studies on clay sample saturation by methane hydrates proved that clay particles play an important role in the hydrate accumulation and decomposition processes in sediments. Depending on water content, the same clay mineral can serve as inhibitor, neutral component and promoter of hydrate formation. Wet clay is a good mineral surface for hydrate formation, but clays represent the worst media for hydrate accumulation and existence. Nevertheless, there are many observations of hydrate presence in clay-containing sediments, especially offshore. Experimental modelling of metastable hydrate decomposition in sediment samples recovered from permafrost in “Yamal crater” in the Russian Arctic has shown that metastable hydrates located in frozen, salted clays can generate huge volumes of gas, even with a negligible (tenth and hundredth of a degree) temperature rise.
Highlights
It is well-known at the present time that the main volume of gas in natural gas hydrates is situated in the marine clay-enriched sediments [1]
Some clay-enriched permafrost drill cores recovered in the Russian Arctic released great volumes of gas when thawed in warm liquid
View, it would be interesting to study the impact clay particles on gas it would be interesting to study the impact of clayof particles on gas hydrate hydrate formation conditions, especially at subzero temperatures
Summary
It is well-known at the present time that the main volume of gas in natural gas hydrates is situated in the marine clay-enriched sediments [1]. Some clay-enriched permafrost drill cores recovered in the Russian Arctic released great volumes of gas when thawed in warm liquid. These volumes exceeded the possible free gas volume able to be kept in pore space, indicating the presence of gas hydrates [2]. The majority of these drill cores were recovered from shallow permafrost (down to depth 150 m).
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