气候变化领域集成服务门户(CCPortal): Accumulation conditions and patterns of natural gas hydrate in the Muli permafrost area, northeastern margin of the Qinghai-Tibet Plateau, NW China

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DOI	10.1093/jge/gxad036
	Accumulation conditions and patterns of natural gas hydrate in the Muli permafrost area, northeastern margin of the Qinghai-Tibet Plateau, NW China
	Pei, Fagen; Wang, Xuben; Fang, Hui; He, Dashuang; He, Meixing; Du, Bingrui; Zhang, Penghui; Wang, Xiaojiang
发表日期	2023
ISSN	1742-2132
EISSN	1742-2140
起始页码	635
结束页码	660
卷号	20 期号:4
英文摘要	The Muli permafrost area is the only midlatitude permafrost area where natural gas hydrates (NGHs) have been drilled. Although a series of achievements has been made in studies on NGH accumulation conditions in the permafrost area, related studies on gas hydrate stability zones, gas sources and groundwater are still controversial and need further work. Based on geophysical, geological and geochemical data, this paper systematically elaborates the main NGH accumulation conditions in the Muli area in terms of the pressure-temperature stability conditions, fault structure, gas composition, gas source, reservoir characteristics, groundwater distribution and topographic characteristics. The results show that the thicknesses of the NGH stability zone range from 491.0 to 962.7 m. The fault structure can provide a pathway for hydrocarbon gas migration from deep to NGH stability zones, in which thrust faults can prevent the upwards migration of gas by sealing it below the hanging wall block. Rock fractures in the NGH stability zone can not only be gas migration channels, but also serve as a reservoir space for NGH accumulation. The hydrocarbon gas of NGHs shows multiple origins and is mainly composed of oil-associated gas. The formation of frost mounds related to the overpressured gas ejection caused by NGH decomposition may imply the existence of NGHs. Synthetically, similarities and differences in NGH accumulation conditions between the Muli permafrost area and other high-latitude permafrost areas are proposed, and the 'regression' NGH accumulation pattern in the Muli area is constructed. The study results can enrich theoretical knowledge of terrestrial NGH accumulation, and provide scientific guidance for NGH exploration in midlatitude permafrost areas.
关键词	natural gas hydrates Muli permafrost area gas hydrate stability zone accumulation condition accumulation pattern
英文关键词	QILIAN MOUNTAIN PERMAFROST; STRATIGRAPHIC TEST WELL; PETROLEUM SYSTEM; STABILITY ZONE; NORTH SLOPE; SEA; POCKMARKS; SHELF; BASIN
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:001025269200002
来源期刊	JOURNAL OF GEOPHYSICS AND ENGINEERING
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283540
作者单位	Chengdu University of Technology; China Geological Survey; Institute of Geophysical & Geochemical Exploration, Chinese Academy of Geological Sciences; Chinese Academy of Geological Sciences; Ministry of Natural Resources of the People's Republic of China
推荐引用方式 GB/T 7714	Pei, Fagen,Wang, Xuben,Fang, Hui,et al. Accumulation conditions and patterns of natural gas hydrate in the Muli permafrost area, northeastern margin of the Qinghai-Tibet Plateau, NW China[J],2023,20(4).
APA	Pei, Fagen.,Wang, Xuben.,Fang, Hui.,He, Dashuang.,He, Meixing.,...&Wang, Xiaojiang.(2023).Accumulation conditions and patterns of natural gas hydrate in the Muli permafrost area, northeastern margin of the Qinghai-Tibet Plateau, NW China.JOURNAL OF GEOPHYSICS AND ENGINEERING,20(4).
MLA	Pei, Fagen,et al."Accumulation conditions and patterns of natural gas hydrate in the Muli permafrost area, northeastern margin of the Qinghai-Tibet Plateau, NW China".JOURNAL OF GEOPHYSICS AND ENGINEERING 20.4(2023).