气候变化领域集成服务门户(CCPortal): Fractures in Low-Permeability Rocks: Can Poroelastic Effects Associated With Damage Zones Enhance Their Seismic Visibility?

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DOI	10.1029/2020JB021155
	Fractures in Low-Permeability Rocks: Can Poroelastic Effects Associated With Damage Zones Enhance Their Seismic Visibility?
	Sotelo E.; Rubino J.G.; Solazzi S.G.; Barbosa N.D.; Holliger K.
发表日期	2021
ISSN	21699313
卷号	126 期号:5
英文摘要	Fluid pressure diffusion (FPD) between a fracture and a porous permeable background can increase the normal compliance of the fracture and, thus, its reflectivity. However, many fractured environments of interest are associated with background rocks that can be regarded as largely impermeable for the the typical frequencies employed in seismic surveys. Nonetheless, there is evidence to suggest that the seemingly ubiquitous presence of damaged zones (DZs) associated with fractures may provide the necessary hydraulic communication between fractures and their immediate surroundings for FPD to occur. Here, we assess the pertinence of this phenomenon. To this end, we consider a 1D elastic-poroelastic model, which comprises a poroelastic system consisting of a fracture embedded in adjacent DZ layers. This system is enclosed in an impermeable background represented by two elastic half-spaces. We calculate the frequency-dependent P-wave reflectivity at normal incidence at the background-DZ interface for different permeabilities, thicknesses, and porosities of the DZ. We also evaluate the corresponding normal fracture compliance. Our results show that, when accounting for the presence of a DZ surrounding an individual fracture, FPD effects between these regions induce a higher seismic reflectivity and a higher normal compliance compared to that of a hydraulically isolated fracture. This, in turn, implies that, even in largely impermeable environments, the seismic visibility of fractures can be enhanced through FPD enabled by the presence of DZs. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	fracture compliance; fracture reflectivity; poroelasticity; semi-analytical modeling
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/187124
作者单位	Institute of Earth Sciences, University of Lausanne, Lausanne, Switzerland; CONICET, Centro Atómico Bariloche – CNEA, San Carlos de Bariloche, Argentina; Department of Earth Sciences, University of Geneva, Geneva, Switzerland
推荐引用方式 GB/T 7714	Sotelo E.,Rubino J.G.,Solazzi S.G.,et al. Fractures in Low-Permeability Rocks: Can Poroelastic Effects Associated With Damage Zones Enhance Their Seismic Visibility?[J],2021,126(5).
APA	Sotelo E.,Rubino J.G.,Solazzi S.G.,Barbosa N.D.,&Holliger K..(2021).Fractures in Low-Permeability Rocks: Can Poroelastic Effects Associated With Damage Zones Enhance Their Seismic Visibility?.Journal of Geophysical Research: Solid Earth,126(5).
MLA	Sotelo E.,et al."Fractures in Low-Permeability Rocks: Can Poroelastic Effects Associated With Damage Zones Enhance Their Seismic Visibility?".Journal of Geophysical Research: Solid Earth 126.5(2021).