Elastic wave propagation and scattering in prestressed porous rocks

作     者：Li-Yun FU Bo-Ye FU Weijia SUN Tongcheng HAN Jianlin LIU Li-Yun FU;Bo-Ye FU;Weijia SUN;Tongcheng HAN;Jianlin LIU

作者机构：Key Laboratory of Deep Oil and GasChina University of Petroleum(East China)Qingdao 266580China Laboratory for Marine Mineral ResourcesQingdao National Laboratory for Marine Science and TechnologyQingdao 266071China Key Laboratory of Earth and Planetary PhysicsInstitute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Institutions of Earth ScienceChinese Academy of SciencesBeijing 100029China College of Earth and Planetary SciencesUniversity of Chinese Academy of SciencesBeijing 100049China 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2020年第63卷第9期

页      面：1309-1329页

核心收录：

学科分类：08[工学] 0824[工学-船舶与海洋工程] 

基　　金：supported by National Natural Science Foundation of China(Grant No.41821002) National Major Project of China(Grant No.2017ZX05008007) Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA14010303) 

主　　题：Poro-acoustoelasticity with compliant pores Elastic waves Prestressed porous rocks Numerical modeling Stressinduced scattering attenuation 

摘      要：Poro-acoustoelastic theory has made a great progress in both theoretical and experimental aspects,but with no publications on the joint research from theoretical analyses,experimental measurements,and numerical *** key issues challenge the joint research with comparisons of experimental and numerical results,such as digital imaging of heterogeneous poroelastic properties,estimation of acoustoelastic constants,numerical dispersion at high frequencies and strong heterogeneities,elastic nonlinearity due to compliant pores,and contamination by boundary *** poroacoustoelastic theory,valid for the linear elastic deformation of rock grains and stiff pores,is modified by incorporating a dualporosity model to account for elastic nonlinearity due to compliant pores subject to high-magnitude loading stresses.A modified finite-element method is employed to simulate the subtle effect of microstructures on wave propagation in prestressed digital *** measure the heterogeneity of samples by extracting the autocorrelation length of digital cores for a rough estimation of scattering *** conductexperimental measurements with a fluid-saturated sandstone sample under a constant confining pressure of 65 MPa and increasing pore pressures from 5 to 60 *** simulations for ultrasound propagation in the prestressed fluid-saturated digital core of the sample are followed based on the proposed poro-acoustoelastic model with compliant *** results demonstrate a general agreement between experimental and numerical waveforms for different stresses,validating the performance of the presented modeling *** excellent agreement between experimental and numerical coda quality factors demonstrates the applicability for the numerical investigation of the stress-associated scattering attenuation in prestressed porous rocks.