气候变化领域集成服务门户(CCPortal): Pressure Solution Compaction During Creep Deformation of Tournemire Shale: Implications for Temporal Sealing in Shales

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DOI	10.1029/2020JB021370
	Pressure Solution Compaction During Creep Deformation of Tournemire Shale: Implications for Temporal Sealing in Shales
	Geng Z.; Bonnelye A.; David C.; Dick P.; Wang Y.; Schubnel A.
发表日期	2021
ISSN	21699313
卷号	126 期号:3
英文摘要	The temporal evolution of gouge compaction determines fluid transfer and rock rupture dynamics. Thus, studies on the time-dependent creep compaction processes of shale materials may elucidate the chemo-mechanical behavior of shallow clay-rich zones. We investigated this problem by combining creep experiments conducted in triaxial compression under upper crustal conditions with modeled pressure solution processes in Tournemire shale. The shale samples were deformed parallel and perpendicular to the bedding at low (10 MPa, 26°C, this study) and high (80 MPa, 26°C, published by Geng et al., 2018, https://doi.org/10.1029/2018JB016169) pressures. We monitored the deformation during stepping creep experiments until sample failure. Our results differ from those of traditional creep experiments and show that the creep failure strength of Tournemire shale samples increased significantly (by ∼64%) at both pressures. Our experiments suggest that at appropriate temperatures, the pressure solution is highly active and is the dominant temporal sealing mechanism in the shale. Using our experimental data and the statistical rock physics method, we modeled the temporal reduction of effective porosity in terms of depth and temperature. Our thermal-stress coupled modeling results suggest that the pressure solution induced sealing is the most active at middle-shallow depths (∼3.8 km). We believe that the sealing capacity and creep failure strength of dolomite-rich shales may change significantly at middle-shallow depths, indicating an important influence on reservoir fluids transfer and fault gouge strength. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	clay rich material; creep deformation; fault gouge; pressure solution; shale; strength gain
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/187265
作者单位	Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; Laboratoire de Géologie de l'ENS (UMR 8538)–PSL Research University, Paris, France; Helmholtz Center Potsdam GFZ German Research Center for Geosciences, Section 4.2 Geomechanics and Scientific Drilling, Telegrafeberg, Potsdam, Germany; Département Géosciences & Environnement, Université de Cergy Pontoise, Cergy-Pontoise, France; Institut de Radioprotection et de Sûreté Nucléaire (IRSN), France; University of Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Geng Z.,Bonnelye A.,David C.,et al. Pressure Solution Compaction During Creep Deformation of Tournemire Shale: Implications for Temporal Sealing in Shales[J],2021,126(3).
APA	Geng Z.,Bonnelye A.,David C.,Dick P.,Wang Y.,&Schubnel A..(2021).Pressure Solution Compaction During Creep Deformation of Tournemire Shale: Implications for Temporal Sealing in Shales.Journal of Geophysical Research: Solid Earth,126(3).
MLA	Geng Z.,et al."Pressure Solution Compaction During Creep Deformation of Tournemire Shale: Implications for Temporal Sealing in Shales".Journal of Geophysical Research: Solid Earth 126.3(2021).