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Effect of permafrost properties on gas hydrate petroleum system in the Qilian Mountains, Qinghai, Northwest China
Wang PK; Zhang XH(张旭辉); Zhu YH; Li B; Huang X; Pang SJ; ZhangS; Lua C; Xiao R; Wang, PK (reprint author), China Geol Survey, Oil & Gas Survey, Beijing 100029, Peoples R China.
Source PublicationEnvironmental Science Processes & Impacts
2014-12
Volume16Issue:12Pages:2711-2720
ISSN2050-7887
Abstract

The gas hydrate petroleum system in the permafrost of the Qilian Mountains, which exists as an epigenetic hydrocarbon reservoir above a deep-seated hydrocarbon reservoir, has been dynamic since the end of the Late Pleistocene because of climate change. The permafrost limits the occurrence of gas hydrate reservoirs by changing the pressure–temperature (PT) conditions, and it affects the migration of the underlying hydrocarbon gas because of its strong sealing ability. In this study, we reconstructed the permafrost structure of the Qilian Mountains using a combination of methods and measured methane permeability in ice-bearing sediment permafrost. A relationship between the ice saturation of permafrost and methane permeability was established, which permitted the quantitative evaluation of the sealing ability of permafrost with regard to methane migration. The test results showed that when ice saturation is >80%, methane gas can be completely sealed within the permafrost. Based on the permafrost properties and genesis of shallow gas, we suggest that a shallow “gas pool” occurred in the gas hydrate petroleum system in the Qilian Mountains. Its formation was related to a metastable gas hydrate reservoir controlled by the PT conditions, sealing ability of the permafrost, fault system, and climatic warming. From an energy perspective, the increasing volume of the gas pool means that it will likely become a shallow gas resource available for exploitation; however, for the environment, the gas pool is an underground “time bomb” that is a potential source of greenhouse gas.



Graphical abstract: Effect of permafrost properties on gas hydrate petroleum system in the Qilian Mountains, Qinghai, Northwest China
Subject Area渗流
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Indexed BySCI
Language英语
WOS IDWOS:000345454100005
Funding OrganizationWe thank the anonymous reviewers and publishing editor (Dr Jack Busby from Royal Society of Chemistry) for their many useful comments and suggestions, which helped improve the paper. This work was funded by the National Natural Science Foundation of China (Grant no.: 41102021, 41202099), National Special Research Fund (Gas Hydrate Resource Exploration and Production Testing Project) (Grant no.: GZHL20110308, GZH201400301), and Chinese Polar Environment Comprehensive Investigation & Assessment Programmes (Grant no.: CHI-NARE2014-04-05).
DepartmentLMFS海洋土力学(LHO)
Classification二类/Q2
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/49357
Collection流固耦合系统力学重点实验室
Corresponding AuthorWang, PK (reprint author), China Geol Survey, Oil & Gas Survey, Beijing 100029, Peoples R China.
Recommended Citation
GB/T 7714
Wang PK,Zhang XH,Zhu YH,et al. Effect of permafrost properties on gas hydrate petroleum system in the Qilian Mountains, Qinghai, Northwest China[J]. Environmental Science Processes & Impacts,2014,16(12):2711-2720
APA Wang PK.,Zhang XH.,Zhu YH.,Li B.,Huang X.,...&Wang, PK .(2014).Effect of permafrost properties on gas hydrate petroleum system in the Qilian Mountains, Qinghai, Northwest China.Environmental Science Processes & Impacts,16(12),2711-2720.
MLA Wang PK,et al."Effect of permafrost properties on gas hydrate petroleum system in the Qilian Mountains, Qinghai, Northwest China".Environmental Science Processes & Impacts 16.12(2014):2711-2720.
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