气候变化领域集成服务门户(CCPortal): Evidence for massive emission of methane from a deep‐water gas field during the Pliocene

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DOI	10.1073/pnas.2001904117
	Evidence for massive emission of methane from a deep‐water gas field during the Pliocene
	Foschi M.; Cartwright J.A.; MacMinn C.W.; Etiope G.
发表日期	2020
ISSN	0027-8424
起始页码	27869
结束页码	27876
卷号	117 期号:45
英文摘要	Geologic hydrocarbon seepage is considered to be the dominant natural source of atmospheric methane in terrestrial and shallow-water areas; in deep‐water areas, in contrast, hydrocarbon seepage is expected to have no atmospheric impact because the gas is typically consumed throughout the water column. Here, we present evidence for a sudden expulsion of a reservoir‐size quantity of methane from a deep‐water seep during the Pliocene, resulting from natural reservoir overpressure. Combining three-dimensional seismic data, borehole data and fluid‐flow modeling, we estimate that 18–27 of the 23–31 Tg of methane released at the seafloor could have reached the atmosphere over 39–241 days. This emission is ∼10% and ∼28% of present‐day, annual natural and petroleum‐industry methane emissions, respectively. While no such ultraseepage events have been documented in modern times and their frequency is unknown, seismic data suggest they were not rare in the past and may potentially occur at present in critically pressurized reservoirs. This neglected phenomenon can influence decadal changes in atmospheric methane. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Carbon budget; Climate change; Methane emission; Seepage; Topseal failure
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160733
作者单位	Foschi, M., Department of Earth Sciences, University of Oxford, Oxford, OX1 3AN, United Kingdom; Cartwright, J.A., Department of Earth Sciences, University of Oxford, Oxford, OX1 3AN, United Kingdom; MacMinn, C.W., Department of Engineering Science, University of Oxford, Oxford, OX1 3PJ, United Kingdom; Etiope, G., Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma 2, Rome, 00143, Italy, Faculty of Environmental Science and Engineering, Babes-Bolyai University, Cluj‐Napoca, 4002949, Romania
推荐引用方式 GB/T 7714	Foschi M.,Cartwright J.A.,MacMinn C.W.,等. Evidence for massive emission of methane from a deep‐water gas field during the Pliocene[J],2020,117(45).
APA	Foschi M.,Cartwright J.A.,MacMinn C.W.,&Etiope G..(2020).Evidence for massive emission of methane from a deep‐water gas field during the Pliocene.Proceedings of the National Academy of Sciences of the United States of America,117(45).
MLA	Foschi M.,et al."Evidence for massive emission of methane from a deep‐water gas field during the Pliocene".Proceedings of the National Academy of Sciences of the United States of America 117.45(2020).