液-固界面反射纵波的虚拟横向位移  

Virtual lateral displacement of primary waves reflected by a liquid-solid interface

作　　者：法林 席冰洁 张晓琳 张琦 王毛毛 范瑾 FA Lin, XI Bingjie, ZHANG Xiaolin, ZHANG Qi, WANG Maomao, FAN Jin(School of Electronic Engineering, Xi＇an University of Posts and Telecommunications, Xi＇an 710121, China)

机构地区：[1]西安邮电大学电子工程学院,陕西西安710121

出　　处：《西安邮电大学学报》2018年第2期71-77,共7页Journal of Xi’an University of Posts and Telecommunications

基　　金：国家自然科学基金资助项目(40974078)

摘　　要：通过对光学中Goos-Hnchen效应的类比,建立虚拟横向位移模型,推导反射纵波在液-固界面上的传播速度的数学表达式。数值模拟结果表明:在声波测井中测量到的声波首波信号是在液-固界面产生的具有渡越时间/横向位移的反射纵波,而不是通常声波测井模型所认为的以固定传播速度在液-固界面(或井壁)传播的滑行折射纵波。这个反射纵波在界面上的有效传播速度不仅与界面两侧介质的物理参数有关,而且与入射角有关。By analogy with the Goos-Hnchen effect in optics,a virtual lateral displacement model is established,and the mathematical expression of the propagation velocity of reflected primary wave at the liquid-solid interface is derived.Numerical simulation results show that,the first arrival of sonic logging signal is a reflection primary wave with transition-time/lateral-displacement produced at the liquid-solid interface,rather than the refraction primary wave which propagates on liquid-solid interface/borehole-wall at a fixed propagation velocity.The effective propagation velocity of this reflected primary wave at the interface is not only related to the physical parameters of the medium on both sides of the interface,but also to the incident angle of the wave.

关 键 词：液-固界面 纵波(P-波) 横向位移 渡越时间 有效传播速度 

分 类 号：P631.4[天文地球—地质矿产勘探]