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
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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. |
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