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Sensitivity of seismic attenuation and dispersion to dynamic elastic interactions of connected fractures: Quasi-static finite element modeling study

摘要:Prediction of seismic attenuation and dispersion that are inherently sensitive to hydraulic and elastic properties of the medium of interest in the presence of mesoscopic fractures and pores, is of great in-terest in the characterization of fractured formations. This has been very difficult, however, considering that stress interactions between fractures and pores, related to their spatial distributions, tend to play a crucial role on affecting overall dynamic elastic properties that are largely unexplored. We thus choose to quantitatively investigate frequency-dependent P-wave characteristics in fractured porous rocks at the scale of a representative sample using a numerical scale-up procedure via performing finite element modelling. Based on 2-D numerical quasi-static experiments, effects of fracture and fluid properties on energy dissipation in response to wave-induced fluid flow at the mesoscopic scale are quantified via solving Biot's equations of consolidation. We show that numerical results are sensitive to some key characteristics of probed synthetic rocks containing unconnected and connected fractures, demon-strating that connectivity, aperture and inclination of fractures as well as fracture infills exhibit strong impacts on the two manifestations of WIFF mechanisms in the connected scenario, and on resulting total wave attenuation and phase velocity. This, in turn, illustrates the importance of these two WIFF mechanisms in fractured rocks and thus, a deeper understanding of them may eventually allow for a better characterization of fracture systems using seismic methods. Moreover, this presented work combines rock physics predictions with seismic numerical simulations in frequency domain to illustrate the sensitivity of seismic signatures on the monitoring of an idealized geologic CO2 sequestration in fractured reservoirs. The simulation demonstrates that these two WIFF mechanisms can strongly modify seismic records and hence, indicating that incorporating the two energy dissipation mechanisms in the geophysical interpretation can potentially improving the monitoring and surveying of fluid variations in fractured formations.(c) 2022 The Authors. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/ 4.0/).

关键字:Attenuation and dispersion; Rock physics; Fractured media; Frequency dependence; Numerical study

ISSN号:1672-5107

卷、期、页:卷20期1: 177-198

发表日期:2023-02-01

影响因子:0.000000

期刊分区(SCI为中科院分区):二区

收录情况:SCI(科学引文索引印刷版),CSCD(中国科技引文期刊)(核心),EI(工程索引),SCIE(科学引文索引网络版)

发表期刊名称:Petroleum Science

参与作者:何文涛,张家良,刘卫华,马宵一,刘俊洲,Song, Xiang -Long

通讯作者:张孟凡

第一作者:贺艳晓,唐跟阳,王尚旭,李国发

论文类型:期刊论文

论文概要:贺艳晓,何文涛,张孟凡,张家良,刘卫华,马宵一,唐跟阳,王尚旭,李国发,刘俊洲,Song, Xiang -Long,Sensitivity of seismic attenuation and dispersion to dynamic elastic interactions of connected fractures: Quasi-static finite element modeling study,Petroleum Science,2023,卷20期1: 177-198

论文题目:Sensitivity of seismic attenuation and dispersion to dynamic elastic interactions of connected fractures: Quasi-static finite element modeling study

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