Major Evidence for Gas Hydrate Existence in the Qilian Permafrost, Qinghai

Abstract

Abstract:

Gas hydrate was discovered for the first time on the continent of China, namely in the Qilian Mountain permafrost of Qinghai Province in the winter of 2008 and the summer of 2009. In the field, white icelike gas hydrate and the burning phenomenon were directly observed. Its obvious relevant anomalies were also recorded. These anomalies include phenomena of strongly bubbling and water seeping on the fresh surface of gas hydrate bearing cores, a chain of bubbles coming from under water when gas hydrate bearing cores are submerged, extraordinary gases coming from the well when gas hydrate bearing layers are drilled through, a large amount of gases when gas hydrate bearing cores are extracted under airtight conditions, heavy hydrocarbon traces and residual cellular textures over the surface of gas hydrate bearing cores, concomitant rhombic autogenetic calcite crystals, relatively low temperature signals indicated by infrared camera, etc. Indoor Raman spectrometry excellently detected normal peaks of hydrate water and its caged hydrocarbons. Macroscopically gas hydrate bearing layers corresponded to high electrical resistivity and sonic velocity in the log profile. Generally gas hydrate and its related anomalies occurred either in the pore and fissure of fine sandstone or in the fissure of mudstone, oily shale, siltstone at the 130-400 m interval of the Qilian Mountain permafrost.

Key words: gas hydrate, major evidence, permafrost, Qilian Mountain, Qinghai

CLC Number:

TE132.2

LU Zhen-Quan, ZHU You-Hai, ZHANG Yong-Qin, WEN Huai-Jun, Jia Zhi-Yao. Major Evidence for Gas Hydrate Existence in the Qilian Permafrost, Qinghai[J]. Geoscience, 2010, 24(2): 329-336.

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