气候变化领域集成服务门户(CCPortal): Tectonic and Anthropogenic Microseismic Activity While Drilling Toward Supercritical Conditions in the Larderello-Travale Geothermal Field, Italy

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DOI	10.1029/2019JB018618
	Tectonic and Anthropogenic Microseismic Activity While Drilling Toward Supercritical Conditions in the Larderello-Travale Geothermal Field, Italy
	Minetto R.; Montanari D.; Planès T.; Bonini M.; Del Ventisette C.; Antunes V.; Lupi M.
发表日期	2020
ISSN	21699313
卷号	125 期号:2
英文摘要	This study investigates the seismic activity occurring at the Larderello-Travale geothermal field, central Italy, from June 2017 to January 2018. We deployed a network composed of nine broadband stations around the Venelle 2 well drilling for supercritical fluids. During the experiment, we recognize two types of seismic events (type 1 and type 2). Type-1 events have clear (Formula presented.) and (Formula presented.) wave arrivals and occur in clusters both above and below the K-horizon, which is a seismic reflector marking a debated transition zone at depth. The distribution and evolution of the seismic sequences suggest that the K-horizon could be interpreted as a fluid-rich region at near-lithostatic pressures. Type-2 events usually occur in swarms and show a periodic pattern, a narrow frequency band, and almost identical waveforms. Their source is estimated to be located near the well, and their occurrence ceases after about 3 weeks from the conclusion of the drilling. We propose a causal link with the drilling operations where pressure fronts inside the well may promote phase changes and fluid flow across the drilled formations. Our study sheds light on the fluid-driven tectonic and anthropogenic seismic activity at the Larderello-Travale geothermal field. More generally, we show that microseismic activity occurring during drilling in high-pressure and high-temperature conditions can remain at low magnitudes and that geothermal wells targeting geothermal fluids in such systems may be handled safely despite the critical conditions encountered at depth. The drilling of the Venelle 2 well is an encouraging example for the development of geothermal energy in critical conditions. ©2020. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187982
作者单位	Department of Earth Sciences, University of Geneva, Geneva, Switzerland; Université Grenoble Alpes, Université Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, Grenoble, France; Institute of Geosciences and Earth Resources, National Research Council of Italy (CNR), Florence, Italy; Department of Earth Sciences, University of Florence, Florence, Italy
推荐引用方式 GB/T 7714	Minetto R.,Montanari D.,Planès T.,et al. Tectonic and Anthropogenic Microseismic Activity While Drilling Toward Supercritical Conditions in the Larderello-Travale Geothermal Field, Italy[J],2020,125(2).
APA	Minetto R..,Montanari D..,Planès T..,Bonini M..,Del Ventisette C..,...&Lupi M..(2020).Tectonic and Anthropogenic Microseismic Activity While Drilling Toward Supercritical Conditions in the Larderello-Travale Geothermal Field, Italy.Journal of Geophysical Research: Solid Earth,125(2).
MLA	Minetto R.,et al."Tectonic and Anthropogenic Microseismic Activity While Drilling Toward Supercritical Conditions in the Larderello-Travale Geothermal Field, Italy".Journal of Geophysical Research: Solid Earth 125.2(2020).