气候变化领域集成服务门户(CCPortal): Induced Earthquakes Before and After Cessation of Long-Term Injections in Rongchang Gas Field

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DOI	10.1029/2020GL089569
	Induced Earthquakes Before and After Cessation of Long-Term Injections in Rongchang Gas Field
	Wang Z.; Lei X.; Ma S.; Wang X.; Wan Y.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:22
英文摘要	For more than three decades, the depleted Rongchang gas reservoir in China's Sichuan Basin was used for the disposal of unwanted water, which resulted in induced earthquakes, with magnitudes as high as 5.2. After all wells were closed, the frequency of seismic activity was observed to decay following a modified Omori law, and since April 2015, seismic activity again began to increase, and a M4.9 earthquake occurred on 27 December. The results of an epidemic-type aftershock sequence (ETAS) model analysis show that forced seismicity accounted for more than 70% of the total events. For most M ≥ 3.5 earthquakes, including two M ≥ 4 events, the estimated overpressure was lower than the maximum injection pressure. These results, coupled with the fact that postinjection seismic activity has similar characteristics to seismicity during injection, indicate that the injected overpressure fluid was still the driving factor for postinjection seismic activity. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Petroleum reservoirs; Driving factors; Epidemic-type aftershock sequences; Gas reservoir; Injection pressures; Model analysis; Post injection; Seismic activity; Sichuan Basin; Earthquakes; aftershock; earthquake event; fluid injection; gas field; mining-induced seismicity; overpressure; China; Chongqing; Rongchang Gas Field; Sichuan Basin
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169419
作者单位	State Key Laboratory of Earthquake Dynamics, Institute of Geology, CEA, Beijing, China; Geological Survey of Japan, AIST, Ibaraki, Japan; Chongqing Earthquake Agency, Chongqing, China; Institute of Disaster Prevention, CEA, Hebei, China
推荐引用方式 GB/T 7714	Wang Z.,Lei X.,Ma S.,et al. Induced Earthquakes Before and After Cessation of Long-Term Injections in Rongchang Gas Field[J],2020,47(22).
APA	Wang Z.,Lei X.,Ma S.,Wang X.,&Wan Y..(2020).Induced Earthquakes Before and After Cessation of Long-Term Injections in Rongchang Gas Field.Geophysical Research Letters,47(22).
MLA	Wang Z.,et al."Induced Earthquakes Before and After Cessation of Long-Term Injections in Rongchang Gas Field".Geophysical Research Letters 47.22(2020).