Abstract:

Based on the geological information derived from 14 gas hydrate drilling holes in Sanlutian of Muli，Qinghai, the basic features of gas hydrates’output, occurrence and spatial distribution are analyzed in this paper. According to the inner connection between inter-restriction and inter-stimulation of multivariate control factors, which is taken as a bridge, the gas hydrate reservoir is introduced as a study subject. From the aspects of reservoir analysis, it shows that the gas hydrate is controlled by lithofacies, which makes its spatial distribution appear to be selective, extensile and comparable to some extent, namely the relative stability of its reservoir appearance in Sanlutian. The gas hydrate distribution in the interior reservoir is also controlled by various occurrence of fracture besides the various occurrence of the reservoir in Sanlutian, leading to irregular distribution in space and frequently sudden disappearance or sudden appearance of gas hydrate.

Key words: permafrost area, natural gas hydrate, distribution characteristic, Sanlutian of Muli, Qinghai