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Abstract

Sound field in fluid-saturated porous medium is closely related to the viscosity of fluid and the heterogeneity of porous medium. In order to improve the physical mechanism of wave propagation in porous medium and expand its application in borehole acoustic field, the shear stress of porous fluid and the heterogeneity of pore structure are considered. The wave theory in porous medium containing viscous fluid is deduced based on the Biot theory. The influence of porous medium parameters on slow shear wave is analyzed, and the dispersion and attenuation of elastic wave caused by shear stress balance in porous fluid under the influence of inhomogeneous pore structure are studied. The analytical solution of borehole acoustic field in porous medium containing viscous fluid is further derived. The phase velocity and attenuation of borehole mode waves in heterogeneous porous medium, and the waveform of borehole full wave are calculated. The influence of pore fluid viscosity on borehole full wave is analyzed. The results show that there are slow shear waves in the porous medium containing viscous fluid. The slow shear wave is characterized by low velocity and large attenuation. In heterogeneous porous medium, the balance process of shear stress related to slow shear wave not only leads to the dispersion and attenuation of fast P-wave, but also affects the propagation characteristics of borehole pseudo Rayleigh wave and Stoneley wave. In addition, the pore fluid viscosity has a great influence on the borehole Stoneley wave. The present work improves the physical mechanism of acoustic wave propagation in porous medium and provides theoretical guidance for the explanation and application of borehole acoustic waves in porous formations.

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Authors and contacts

Corresponding author:Zhang Xiu-Mei,zhangxiumei@mail.ioa.ac.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant Nos. 11974018, 11734017) and the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA14020303).

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参数	${\rho _{\rm{s}}}$/(kg·m^–3)	${\rho _{\rm{f}}}$/(kg·m^–3)	$ {k_0} $/D	$ \eta $/%	${\mu _{\rm{f}}}$/(Pa·s)	$ {S^\infty } $	${K_{\rm{f}}}$/GPa	$ {K_0} $/GPa	${K_{\rm{s}}}$/GPa	$ {\mu _0} $/GPa	${\mu _{\rm{s}}}$/GPa
值	2650	1000	1	20	10^–3	3	2.25	14.39	35.7	14	44

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温度/℃	20	50	150
黏度/(10^–3Pa·s)	1.00	0.55	0.21

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Vol. 72, Issue 5 - 2023-03-05

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