Goos-Hanchen效应的声学模拟及在地球物理中的应用

Acoustic simulation of Goos-Hanchen effect and its application on geophysics

在概述古斯-汉森效应(Goos-Hanchen)的声学模拟的基础上,提出反射P波在液体-固体(液-固)界面上产生的横向位移的新物理模型。以水-有机玻璃界面为例,对反射P波的一些物理特性进行数值计算和分析。结果表明,对于过入射临界角区域,反射P波在液-固界面上会产生一个横向位移;反射P波在界面上的传播速度不但与界面两侧介质的物理参数有关,还与入射P波的入射角有关。因此可以预测,在声波测井中测量到的首波信号可能是反射P波,而不是传统声波测井模型中描述的"滑行折射P波";将液-固界面上的声学横向位移的物理模型推广到固体-固体(固-固)界面上,可建立一种大角度(过入射临界角)入射的地震勘探数据的精确时-深转换算法。

Based on the summarising of the acoustic simulation of the Goos-Hanchen effect,a new physical model for the lateral displacement of the reflection P wave induced at the liquid-solid interface is proposed.Using water-plexiglass interface as an example,some physical properties of the reflection P wave are numerically calculated and analyzed.Results show that for the post-critical angle incidence region,the reflection P wave will create a lateral displacement at the interface,and the propagation velocity of the reflection P wave at the interface is related to not only the physical parameters of the media at both sides of the interface but also the incident angle of the wave.Therefore,it can be predicted that the first arrive of measured wave signal in acoustic logging may be reflection P wave rather than ’ the sliding refraction P wave ’ described by traditional acoustic logging model,and that an accurate time-depth conversion algorithm for seismic exploration data with a large angle incidence can be established by extending the physical model of the lateral displacement of the liquid-solid interface to the solid-solid interface.