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A viscoelastic representation of seismic wave attenuation and dispersion caused by wave-induced fluid flow in fractured porous media

HUITIAN LAN1 ,  SHUMIN CHEN1 ,  HUANZHAO CHI2* ,  JIANGYUN PEI1 ,  WEN LIN1 ,  JIAGANG SHEN1
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1 Exploration and Development Research Institute of Daqing Oil Company, Daqing 163712, P.R. China,
2 School of Prospecting and Surveying Engineering, Changchun Institute of Technology, Changchun 130021, P.R. China,
JSE 2020, 29(6), 587–601;
Submitted: 8 May 2019 | Accepted: 16 May 2020 | Published: 1 December 2020
© 2020 by the Authors. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution -Noncommercial 4.0 International License (CC-by the license) ( https://creativecommons.org/licenses/by-nc/4.0/ )
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Abstract

Lan, H.T., Chen, S.M., Chi, H.Z., Pei, J.Y., Lin, W. and Shen, J.G., 2020. A viscoelastic representation of seismic wave attenuation and dispersion caused by wave-induced fluid flow in fractured porous media. Journal of Seismic Exploration, 29: 587-601. Analyzing and understanding the seismic response from fractured reservoirs is vital to reservoirs characterization and the production optimization of hydrocarbons. Fractured reservoirs can be modeled as fractured porous media. When seismic waves propagate in fractured porous media, fluid exchange occurs between the fractures and the pore space. As a consequence, the seismic waves are subject to attenuation and dispersion, the media behave viscoelasticity, and the components of the effective stiffness tensor involved in the stress-strain relation become complex-valued and frequency dependent. In order to compute synthetic seismograms in the time domain with the purpose of studying seismic response of the media, an efficient approach is to approximate the stiffnesses by suitable viscoelastic models and then solve viscoelastic differential equations. In this paper, based on the Chapman's model of fractured porous media, we use the Zener model to approximate each component of the effective stiffness tensor, and use the Christoffel equation to obtain the seismic attenuation and velocity dispersion curves and their corresponding Zener model best fits. We focused on three models, each with two different fracture sizes and filled with different fluids. Our results indicate that the Zener model provides a good representation for Chapman's model of fractured porous media.

Keywords
velocity dispersion
wave attenuation
fractured porous media
Zener model
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Journal of Seismic Exploration, Print ISSN: 0963-0651, Published by AccScience Publishing
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