测井技术2025，Vol.49Issue(4)：487-499,13.DOI:10.16489/j.issn.1004-1338.2025.04.001
黏性介质内部质点振动瞬态过程及其应用
Transient Vibrational Behavior of Particles Inside Viscous Media and Its Applications
摘要
Abstract
To explore the transient process of particle vibration inside viscous media and its spectral characteristics,and clarify the generation mechanism and application value of intrinsic noise,a damped oscillation spring oscillator model is adopted to derive the acoustic impulse response and system function of particles inside viscous solid media.Based on intrinsic noise elements and the principle of linear superposition,the motion state of particles under multi-frequency forces is analyzed,the concept of multi-frequency intrinsic noise and its extraction method are proposed,and numerical simulations are conducted with shale,T-Sandstone(Tayler Sandstone),and O-Shale(Oil Shale)as samples.The research results show that:①The spectra of the two transient processes,i.e.,a stationary particle transitioning from rest to steady vibration under a single-frequency harmonic force and from steady vibration to rest when the harmonic force disappears,are intrinsic noise,based on which the concepts of intrinsic noise element and multi-frequency intrinsic noise are proposed.②Under the action of a single-frequency harmonic force,particle vibration includes transient transition and steady sinusoidal vibration,with the amplitude spectrum containing the force frequency(impulse pulse)and intrinsic noise frequency(broadband),there is a 180° phase mutation at the center frequency,and the closer the frequency is to the center frequency,the shorter the transient duration and the larger the amplitude.③Under multi-frequency forces,each frequency component corresponds to different transient and steady states,when the frequency is far from the center frequency,the transient duration is long,and when equal to the center frequency,the transient duration is the shortest and the amplitude is the largest.④Different media have different center frequencies(2.129 MHz for O-Shale,1.695 MHz for T-Sandstone,1.382 MHz for shale),the greater the stiffness,the larger the center frequency,the increase in viscosity reduces the amplitude of the amplitude spectrum,single-frequency forces make it easier to extract intrinsic noise information.It is concluded that intrinsic noise is closely related to the physical properties(viscosity,stiffness,etc.)and internal structure of viscous solids.The extracted intrinsic noise can invert the physical properties and internal structural abnormalities of the medium,laying a foundation for establishing a new particle vibration transmission network model and having potential applications in fields such as logging while drilling.关键词
固体黏性/阻尼衰减/质点振动/瞬态过程/内在噪声/多频内在噪声/系统函数/冲激响应Key words
solid viscosity/damping attenuation/particle vibration/transient process/intrinsic noise/multi-frequency intrinsic noise/system function/impulse response分类
通用工业技术引用本文复制引用
法林,徐渝林,赵梅山,孟爽爽,陈文辉,时鹏,崔新豪,陈超,杨慧婷,邱杰,李瑾玥..黏性介质内部质点振动瞬态过程及其应用[J].测井技术,2025,49(4):487-499,13.基金项目
国家自然科学基金项目"声波反射/折射物理现象的理论研究、实验验证及其应用"(41974130) （41974130）
国家自然科学基金项目"岩石各向异性对地震勘探正演模型和反演解释的影响"(40974078) （40974078）
