首页|P-and SV-wave dispersion and attenuation in saturated microcracked porous rock with aligned penny-shaped fractures

P-and SV-wave dispersion and attenuation in saturated microcracked porous rock with aligned penny-shaped fractures

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P-and SV-wave dispersion and attenuation have been extensively investigated in saturated poroelastic media with aligned fractures.However,there are few existing models that incorporate the multiple wave attenuation mechanisms from the microscopic scale to the macroscopic scale.Hence,in this work,we developed a unified model to incorporate the wave attenuation mechanisms at different scales,which includes the microscopic squirt flow between the microcracks and pores,the mesoscopic wave-induced fluid flow between fractures and background(FB-WIFF),and the macroscopic Biot's global flow and elastic scattering(ES)from the fractures.Using Tang's modified Biot's theory and the mixed-boundary conditions,we derived the exact frequency-dependent solutions of the scattering problem for a single penny-shaped fracture with oblique incident P-and SV-waves.We then developed theoretical models for a set of aligned fractures and randomly oriented fractures using the Foldy approximation.The results indicated that microcrack squirt flow considerably influences the dispersion and attenuation of P-and SV-wave velocities.The coupling effects of microcrack squirt flow with the FB-WIFF and ES of fractures cause much higher velocity dispersion and attenuation for P waves than for SV waves.Randomly ori-ented fractures substantially reduce the attenuation caused by the FB-WIFF and ES,particularly for the ES attenuation of SV waves.Through a comparison with existing models in the limiting cases and previous experimental measurements,we validated our model.

Aligned fracturesP-and SV-waveDispersion and attenuationMicrocracked porous backgroundFB-WIFFElastic scatteringSquirt flow

Sheng-Qing Li、Wen-Hao Wang、Yuan-Da Su、Jun-Xin Guo、Xiao-Ming Tang

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School of Geosciences,China University of Petroleum(East China),Qingdao 266580,Shandong,China

Laoshan National Laboratory,Qingdao 266071,Shangdong,China

Guangdong Provincial Key Laboratory of Geophysical High-resolution Imaging Technology,Southern University of Science and Technology,Shenzhen 518055,Guangdong China

Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen 518055,Guangdong China

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Laoshan National Laboratory Science and Technology Innovation Project国家自然科学基金国家自然科学基金国家自然科学基金Guangdong Provincial Key Laboratory of Geophysical Highresolution Imaging TechnologyShenzhen Stable Support Plan Program for Higher Education Institutions

LSKJ2022034074217414541821002422741462022B121201000220220815110144003

2024

10.1016/j.petsci.2023.08.029

石油科学(英文版)
中国石油大学（北京）

石油科学(英文版)

EI
影响因子：0.88
ISSN：1672-5107
年,卷(期)：2024.21(1)
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