Gas hydrate occurrences in the Qilian Mountain permafrost, Qinghai Province, China

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	Gas hydrate occurrences in the Qilian Mountain permafrost, Qinghai Province, China
	Lu, ZQ (Lu, Zhengquan); Zhu, YH (Zhu, Youhai); Zhang, YQ (Zhang, Yongqin); Wen, HJ (Wen, Huaijun); Li, YH (Li, Yonghong); Liu, CL (Liu, Changling)
刊名	COLD REGIONS SCIENCE AND TECHNOLOGY
	2011
卷号	66 期号:2-3 页码:93-104
关键词	Gas hydrate Permafrost Characteristics Qilian Mountain China
ISSN号	0165-232X
英文摘要	Four scientific experimental wells were drilled in the Qilian Mountain permafrost of Qinghai Province, China, in 2008 and 2009. Gas hydrate was obtained from three of four wells and its related anomalous phenomena were observed in all the four wells. Raman spectroscopy was used in the laboratory to evaluate the type of clathrates recovered from these sites, including structures containing large and small cages of hydrocarbon gases. Gas hydrate and associated anomalies occur mainly in fractured mudstone, oily shale, siltstone, and fine-grained sandstone. Secondary occurrences were also present in the pore space of fine to medium grained sandstone in a zone between 133 and 396 mbs. This interval was vertically discontinuous and horizontally did not appear to correlate between wells. Gas hydrate occurrences in these wells are not solely related to lithology and are strongly controlled by fissures in the Qilian Mountain permafrost. Gas geochemical characteristics reveal that gas hydrate is primarily composed of CH(4), with secondary components of C(2)H(5), C(3)H(8), and CO(2). Raman spectra analysis indicates a sll gas hydrate structure. Gas composition and carbon and hydrogen isotope geochemistry show that gases from gas hydrate are mainly thermogenic with a biogenic fraction. In the study area, gas hydrate and its related anomalous phenomena are confined to the gas hydrate stability zone which is constrained by permafrost pressure and temperature conditions. Core observations indicate that individual gas hydrate occurrences are controlled by fissures. It is speculated that, when hydrocarbon gases reach the gas hydrate stability zone, they form into gas hydrate that occurred preferably in fissures beneath the permafrost. (C) 2011 Elsevier B.V. All rights reserved.
学科主题	油气地质
WOS关键词	GULF-OF-MEXICO ; TIBET PLATEAU PERMAFROST ; GEOCHEMISTRY ; OCEAN
WOS研究方向	Engineering ; Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000289544400005
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39319]
专题	中国地质调查局
作者单位	China Geol Survey, Qingdao Inst Marine Geol, Qingdao 266071, Shandong, Peoples R China
推荐引用方式 GB/T 7714	Lu, ZQ ,Zhu, YH ,Zhang, YQ ,et al. Gas hydrate occurrences in the Qilian Mountain permafrost, Qinghai Province, China[J]. COLD REGIONS SCIENCE AND TECHNOLOGY,2011,66(2-3):93-104.
APA	Lu, ZQ ,Zhu, YH ,Zhang, YQ ,Wen, HJ ,Li, YH ,&Liu, CL .(2011).Gas hydrate occurrences in the Qilian Mountain permafrost, Qinghai Province, China.COLD REGIONS SCIENCE AND TECHNOLOGY,66(2-3),93-104.
MLA	Lu, ZQ ,et al."Gas hydrate occurrences in the Qilian Mountain permafrost, Qinghai Province, China".COLD REGIONS SCIENCE AND TECHNOLOGY 66.2-3(2011):93-104.