气候变化领域集成服务门户(CCPortal): Seismic Signatures of Fractured Porous Rocks: The Partially Saturated Case

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DOI	10.1029/2020JB019960
	Seismic Signatures of Fractured Porous Rocks: The Partially Saturated Case
	Solazzi S.G.; Hunziker J.; Caspari E.; Rubino J.G.; Favino M.; Holliger K.
发表日期	2020
ISSN	21699313
卷号	125 期号:8
英文摘要	Seismic attenuation and phase velocity dispersion due to mesoscopic fluid pressure diffusion (FPD) have received increasing attention due to their inherent sensitivity to the hydromechanical properties of monosaturated fractured porous media. While FPD processes are directly affected by key macroscopic properties of fractured rocks, such as fracture density and fracture connectivity, there is, as of yet, a lack of comprehension of the associated characteristics when multiple immiscible phases saturate the probed fractured medium. In this work, we analyze the variations experienced by P and S wave attenuation and phase velocity dispersion when CO2 percolates into an initially brine-saturated fractured porous rock. We study such variations considering a simple model of a porous rock containing intersecting orthogonal fractures as well as a more complex model comprising a fracture network. In the latter, we simulate the flow of a CO2 plume into the medium using an invasion percolation procedure. Representative samples are subjected to numerical upscaling experiments, consisting of compression and shear tests, prior to and after the CO2 invasion process. Results show that fracture-to-background FPD is only sensitive to the presence of CO2, which decreases its effects. However, fracture-to-fracture FPD depends on both the overall CO2 saturation and the fluid distribution within the fracture network. While the former modulates the magnitude of the dissipation, the latter can give rise to a novel FPD process occurring between CO2-saturated and brine-saturated regions of the fracture network. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	fractured media; numerical modeling; partial saturation; porous media; seismic attenuation
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/187651
作者单位	Institute of Earth Sciences, University of Lausanne, Lausanne, Switzerland; Chair of Applied Geophysics, University of Leoben, Leoben, Austria; CONICET, Centro Atómico Bariloche-CNEA, San Carlos de Bariloche, Argentina; School of Earth Sciences, Zhejiang University, Hangzhou, China
推荐引用方式 GB/T 7714	Solazzi S.G.,Hunziker J.,Caspari E.,et al. Seismic Signatures of Fractured Porous Rocks: The Partially Saturated Case[J],2020,125(8).
APA	Solazzi S.G.,Hunziker J.,Caspari E.,Rubino J.G.,Favino M.,&Holliger K..(2020).Seismic Signatures of Fractured Porous Rocks: The Partially Saturated Case.Journal of Geophysical Research: Solid Earth,125(8).
MLA	Solazzi S.G.,et al."Seismic Signatures of Fractured Porous Rocks: The Partially Saturated Case".Journal of Geophysical Research: Solid Earth 125.8(2020).