摘要：Oscillatory fluid movements due to passing seismic waves in heterogeneous poroelastic rocks cause wave energy dissipation. We calculate in this study the complex and frequency-dependent P wave modulus in porous media exhibiting mesoscopic-scale heterogeneities, via numerically solving the two-dimensional (2-D) Biot's quasi-static equations of consolidation in the displacement-pressure (u-p) formulation in the time domain to model the stress-strain relations using the finite element technique. Upon employing a variable time step in stress to samples having regions saturated with different fluids, the quasi-static finite element procedure computes the efficient and accurate 2-D simulations of the poroelastic response, e.g., the solid displacement u and fluid pressure p, and thus the average strain throughout the sample. The frequency-dependent wave attenuation and dispersion of phase velocity is then obtained from the P wave modulus. Our numerical results show good agreements with the Gassmann Hill (i.e., at very high frequencies) and Gassmann Wood (i.e., at very low frequencies) predictions. We further investigate the role of rock permeability on seismic attenuation and elastic modulus dispersion. The results of this simulating study also show that the characteristic frequency of elastic moduli is approximately proportional to the rock permeability variations, and thus providing a potential means to estimate the rock permeability from the seismic dispersion behaviors.
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卷、期、页：p890-895

发表日期：2021-01-01

收录情况：EI（工程索引）,国际学术会议论文集

发表期刊名称：Proceedings of the 8th Academic Conference of Geology Resource Management and Sustainable Development

通讯作者：何文涛

第一作者：贺艳晓,唐跟阳,王尚旭

论文类型：会议论文

论文概要：何文涛,贺艳晓,唐跟阳,王尚旭，Poroelastic finite element modeling of seismic wave attenuation and dispersion due to wave-induced fluid flow in partially saturated media，Proceedings of the 8th Academic Conference of Geology Resource Management and Sustainable Development，2021，p890-895

论文题目：Poroelastic finite element modeling of seismic wave attenuation and dispersion due to wave-induced fluid flow in partially saturated media