气候变化领域集成服务门户(CCPortal): Seasonal Variation of Methane Microseepage in the Dawanqi Oilfield (China): A Possible Climatic Control

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DOI	10.1029/2021JD034637
	Seasonal Variation of Methane Microseepage in the Dawanqi Oilfield (China): A Possible Climatic Control
	Zhao Y.; Wang G.; Etiope G.; Wang Y.; Zhu Z.; Wang C.; Chen X.; Tang J.
发表日期	2021
ISSN	2169897X
卷号	126 期号:10
英文摘要	Natural gas microseepage in petroleum-bearing sedimentary basins is an important complement to geophysical methods in oil-gas exploration and a natural source of methane (CH4) for the atmosphere. Microseepage, typically occurring in correspondence with petroleum fields throughout the world, is generally lower in summer, due to temperature-driven methanotrophic consumption, and higher in winter. The global estimates of microseepage methane emission have, however, relatively high uncertainties because of limited amounts of flux data, leading to poor knowledge of the spatial distribution and temporal variability of the gas emission factors. We studied the seasonal variation of microseepage flux to the atmosphere from a petroleum field in China (the Dawanqi oilfield), through methane flux measurements performed in summer 2014, winter 2015, and summer 2019. Winter data refer to frozen soil conditions, with snow cover and ice thickness in the soil exceeding 60 cm. Gas concentration (CH4, CO2, C2+ alkanes) and stable C isotopic composition of CH4 and CO2 in shallow (4 m deep) boreholes confirmed the existence of thermogenic gas seepage. Methane microseepage is higher in summer and lower or nil in winter. This seasonal trend is opposite to what was observed in areas where winter soil is not or poorly frozen. Our data suggest that seasonal microseepage variation may not be univocal worldwide, being strongly dependent on the presence of ice and snow cover in winter. The regional increase of temperature due to climate change, already demonstrated for the Tarim Basin over the last 50 years, could, in the future, reduce winter ice and enhance annual methane emission to the atmosphere. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	iced soil; methane; microseepage; petroleum fields; seasonal variations
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185216
作者单位	College of Materials Science and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, China; Wuxi Research Institute of Petroleum Geology, Research Institute of Petroleum Exploration and Production, Wuxi, China; Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy; Faculty of Environmental Science and Engineering, Babes-Bolyai University, Cluj-Napoca, Romania; Department of Kela Oil and Gas Development, PetroChina Tarim Oilfield Company, Korla, China
推荐引用方式 GB/T 7714	Zhao Y.,Wang G.,Etiope G.,et al. Seasonal Variation of Methane Microseepage in the Dawanqi Oilfield (China): A Possible Climatic Control[J],2021,126(10).
APA	Zhao Y..,Wang G..,Etiope G..,Wang Y..,Zhu Z..,...&Tang J..(2021).Seasonal Variation of Methane Microseepage in the Dawanqi Oilfield (China): A Possible Climatic Control.Journal of Geophysical Research: Atmospheres,126(10).
MLA	Zhao Y.,et al."Seasonal Variation of Methane Microseepage in the Dawanqi Oilfield (China): A Possible Climatic Control".Journal of Geophysical Research: Atmospheres 126.10(2021).