Characteristics of seismic wave field in frequency-space domain in strong attenuation media

被引：0
|
作者：
Zhang Y. [1 ]
Wang Y. [1 ]
Chen B. [2 ]
Wang X.-C. [1 ]
机构：
[1] School of Geophysics and Information Technology, China University of Geosciences(Beijing), Beijing
[2] Sinopec Science & Technology Department, Beijing
来源：
Shiyou Diqiu Wuli Kantan/Oil Geophysical Prospecting | 2020年 / 55卷 / 05期
关键词：
Finite difference algorithm; Fluid viscosity; Frequency-space domain; Porosity; Strong attenuation model; Viscoelasticity;
D O I：
10.13810/j.cnki.issn.1000-7210.2020.05.010
中图分类号：
学科分类号：
摘要：
As a viscoelastic medium model, the strong attenuation model applies Biot's basic idea to modify the viscous dissipation coefficient, and describes the absorption and attenuation characteristics of the medium through the equation of motion.Compared with some conventional viscoeastic medium models and viscoelastic-porous medium models, the strong attenuation model can more easily and accurately describe the strong attenuation properties of media such as heavy oil reservoirs and loose sediments near the surface.In this paper, we implement a method of 25-point frequency-space domain finite difference to simulate the wave field characteristics of a strong attenuation model medium, and study the attenuation mechanism of seismic waves caused by three physical factors including porosity, fluid viscosity and viscoelasticity of medium.From the numerical simulation results, we can find that porosity, fluid viscosity and viscoelasticity are all important factors on inducing strong attenuation and high-velocity dispersion of seismic waves, and their influence on attenuation of S-wave is more obvious than that of P-wave.Of which, viscoelasticity is the key factor on affecting the attenuation of high-frequency component of seismic waves, and both porosity and fluid viscosity can cause the attenuation of energy in the effective frequency range of seismic waves, especially porosity has the strongest attenuation effect.We also study the influence of the shallow medium with strong attenuation on the deep wave field, and find that the strong attenuation model is more practical in describing the low-velocity medium by comparing the wave field simulation results under the complete elasticity theory and general viscoelasticity.These results provide a reference to the study of strong attenuation media involving different attenuation mechanisms, and also lay a foundation for the establishment of the comprehensive strong attenuation compensation theory. © 2020, Editorial Department OIL GEOPHYSICAL PROSPECTING. All right reserved.
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页码：1016 / 1028and1046
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