Earth`s Cryosphere, 2019, Vol. XXIII, № 2, p. 44-52
HYDRATE FORMATION IN FROZEN AND THAWING METHANE-SATURATED SEDIMENTS
E.M. Chuvilin1, D.A. Davletshina1,2, M.V. Lupachik3
1 Skolkovo Institute of Science and Technology, Skolkovo Innovation Center,
3, Nobel str., Moscow, 143026, Russia; chuviline@msn.com
2 Lomonosov Moscow State University, Faculty of Geology, 1, Leninskie Gory, Moscow, 119991, Russia
3 IHS Market, 2, Tsvetnoy blv., Moscow, 127051, Russia
The formation of pore gas hydrates in frozen and thawing sand and silt sampled in permafrost areas has been studied in experiments using a special system. As demonstrated by the experimental results, gas hydrates form rapidly in gas-saturated sediments at constant negative temperatures from 0 to –8 °C. The accumulation kinetics of pore gas hydrates in permafrost has multiple controls: temperature, initial ice saturation, and salinity of soils, as well as type of hydrate-forming gas. The process can resume after its decay due to melting of residual pore ice not yet converted to hydrate.
Gas hydrate, sediments, hydrate formation, kinetics, frozen soil, thawing soil, hydrate saturation