气候变化领域集成服务门户(CCPortal): Compaction Banding in High-Porosity Carbonate Rocks: 1. Experimental Observations

CCPortal

DOI	10.1029/2020JB020538
	Compaction Banding in High-Porosity Carbonate Rocks: 1. Experimental Observations
	Abdallah Y.; Sulem J.; Bornert M.; Ghabezloo S.; Stefanou I.
发表日期	2021
ISSN	21699313
卷号	126 期号:1
英文摘要	Identifying the mechanisms that control the formation of compaction bands is of high interest in reservoir mechanics since these structures may drastically affect the performance of geosystems operations. Considering the difficulty to identify compaction bands in carbonate samples tested in the laboratory, the Digital Volume Correlation technique is applied here and proves to be a relevant method. X-Ray Computed Tomography (XRCT) images of Saint-Maximin limestone centimetric samples are recorded before and after several triaxial loading stages and deformation maps are built. A new postprocessing method based on the analysis of the kinematics throughout the observed localization bands is proposed to identify their type. Compaction bands are identified at relatively high-confining pressures, while shear bands are observed at lower confinements. The brittle-ductile transitional regime reveals the formation of compactive shear bands, while a diffuse compaction is observed under hydrostatic loading. The effect of porosity heterogeneities on strain localization is explored by computing 3D porosity maps from calibrated XRCT images. Compaction bands are found to dominantly lay inside high-porosity zones, while shear bands can cross both high- and low-porosity zones. The band orientation is found to be controlled primarily by the confining pressure. Moreover, the porosity heterogeneity strongly affects the volumetric behavior inside the deformation bands, with a dilatant behavior identified in low-porosity zones in contrast to a compactive behavior observed in high-porosity zones. Finally, Scanning Electron Microscopy observations reveal that calcite grain crushing is dominant in high-porosity zones, while intergranular cement cracking occurs in denser zones. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	compaction; limestone; microstructure; strain localization; X-ray computed tomography
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/187437
作者单位	Laboratoire Navier, École des Ponts ParisTech, Univ. Gustave Eiffel, CNRS, Marne-la-Vallée, France; École Centrale de Nantes, Université de Nantes, CNRS, GeM (Institut de Recherche en Génie Civil et Mécanique), Nantes, France
推荐引用方式 GB/T 7714	Abdallah Y.,Sulem J.,Bornert M.,et al. Compaction Banding in High-Porosity Carbonate Rocks: 1. Experimental Observations[J],2021,126(1).
APA	Abdallah Y.,Sulem J.,Bornert M.,Ghabezloo S.,&Stefanou I..(2021).Compaction Banding in High-Porosity Carbonate Rocks: 1. Experimental Observations.Journal of Geophysical Research: Solid Earth,126(1).
MLA	Abdallah Y.,et al."Compaction Banding in High-Porosity Carbonate Rocks: 1. Experimental Observations".Journal of Geophysical Research: Solid Earth 126.1(2021).