气候变化领域集成服务门户(CCPortal): Estimates of Individual Fracture Compliances Along Boreholes From Full-Waveform Sonic Log Data

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DOI	10.1029/2021JB022015
	Estimates of Individual Fracture Compliances Along Boreholes From Full-Waveform Sonic Log Data
	Barbosa N.D.; Greenwood A.; Caspari E.; Dutler N.; Holliger K.
发表日期	2021
ISSN	21699313
卷号	126 期号:5
英文摘要	An important seismic attenuation mechanism in fractured environments is related to energy conversion into reflected and transmitted waves at fracture interfaces. Using full-waveform sonic (FWS) log data, we show that it is possible to quantify transmission losses across a set of fractures from time delays and amplitude differences of the critically refracted P-wave as compared to intact sections along the borehole. In the presence of fractures, the transmission coefficient associated with a given fracture is obtained by combining information on transmission losses from multiple receivers and source positions into a linear system of equations for all fractures intersecting the borehole. Fracture compliance is computed from the inferred transmission coefficient based on a linear slip model. For validation, we use synthetic FWS log data obtained from numerical simulations of wave propagation in a water-filled borehole surrounded by low-permeability rocks with discrete fractures. The methodology is then applied to field data acquired along boreholes penetrating multiple fractures in a granodioritic host rock. We show that our estimations of mechanical compliance are consistent with previously reported values, which were estimated for individual fractures intersecting one of the boreholes with a related method valid only for isolated single fractures. Comparison between our estimates of fracture compliance and transmissivity profiles from previous hydraulic characterizations of the fractures suggests that the proposed method may also allow to locate the most permeable fractures along a borehole, which, in turn, opens the perspective of enhancing the design and effectiveness of subsequent hydraulic testing and fracturing experiments. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	borehole geophysics; fracture compliance; hydromechanical coupling; seismic transmission losses
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/187127
作者单位	Department of Earth Sciences, University of Geneva, Geneva, Switzerland; Now at Institute of Earth Sciences, University of Lausanne, Lausanne, Switzerland; Chair of Applied Geophysics, University of Leoben, Leoben, Austria; Center for Hydrogeology and Geothermics, University of Neuchâtel, Neuchâtel, Switzerland; Applied and Environmental Geophysics Group, Institute of Earth Sciences, University of Lausanne, Lausanne, Switzerland
推荐引用方式 GB/T 7714	Barbosa N.D.,Greenwood A.,Caspari E.,et al. Estimates of Individual Fracture Compliances Along Boreholes From Full-Waveform Sonic Log Data[J],2021,126(5).
APA	Barbosa N.D.,Greenwood A.,Caspari E.,Dutler N.,&Holliger K..(2021).Estimates of Individual Fracture Compliances Along Boreholes From Full-Waveform Sonic Log Data.Journal of Geophysical Research: Solid Earth,126(5).
MLA	Barbosa N.D.,et al."Estimates of Individual Fracture Compliances Along Boreholes From Full-Waveform Sonic Log Data".Journal of Geophysical Research: Solid Earth 126.5(2021).