气候变化领域集成服务门户(CCPortal): Layering in Shales Controls Microfracturing at the Onset of Primary Migration in Source Rocks

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DOI	10.1029/2020JB019444
	Layering in Shales Controls Microfracturing at the Onset of Primary Migration in Source Rocks
	Chauve T.; Scholtès L.; Donzé F.-V.; Haque Mondol N.; Renard F.
发表日期	2020
ISSN	21699313
卷号	125 期号:5
英文摘要	The process of primary migration, which controls the transfer of hydrocarbons from source to reservoir rocks, necessitates the existence of fluid pathways in low permeability sedimentary formations. Primary migration starts with the maturation of organic matter which produces fluids that increase the effective stress locally. The interactions between local fluid production, microfracturing, stress conditions, and transport remain difficult to apprehend in shale source rocks. Here, we analyze these interactions using a coupled hydro-mechanical numerical model based on the discrete element method. The model is used to simulate the effects of fluid production emanating from kerogen patches contained within a shale rock alternating kerogen-poor and kerogen-rich layers. We identify two microfracturing mechanisms that control fluid migration: (i) propagation of hydraulically driven fractures induced by kerogen maturation in kerogen-rich layers and (ii) compression-induced fracturing in kerogen-poor layers caused by fluid overpressurization of the surrounding kerogen-rich layers. The relative importance of these two mechanisms is discussed considering different elastic properties contrasts between the shale layers, as well as various stress conditions encountered in sedimentary basins, from normal to reverse faulting regimes. The layering in shales causes local stress redistribution that controls the prevalence of each mechanism over the other and the onset of microfracturing during kerogen maturation. The approach is applied to the Draupne formation, a major source rock in the Norwegian continental shelf in the North Sea. ©2020. The Authors.
英文关键词	discrete element method; fracturing; layering; primary migration; shales
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/187863
作者单位	The Njord Centre, PGP, Department of Geosciences, University of Oslo, Blindern, Oslo, Norway; Université de Lorraine, CNRS, GeoRessources, Nancy, France; Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, Grenoble, France; Department of Geosciences, University of Oslo (UiO), Oslo, Norway; Norwegian Geotechnical Institute (NGI), Oslo, Norway
推荐引用方式 GB/T 7714	Chauve T.,Scholtès L.,Donzé F.-V.,et al. Layering in Shales Controls Microfracturing at the Onset of Primary Migration in Source Rocks[J],2020,125(5).
APA	Chauve T.,Scholtès L.,Donzé F.-V.,Haque Mondol N.,&Renard F..(2020).Layering in Shales Controls Microfracturing at the Onset of Primary Migration in Source Rocks.Journal of Geophysical Research: Solid Earth,125(5).
MLA	Chauve T.,et al."Layering in Shales Controls Microfracturing at the Onset of Primary Migration in Source Rocks".Journal of Geophysical Research: Solid Earth 125.5(2020).