全反射SH地震波的Goos-Hinchen效应动校正时差  

The influence on normal moveout of total reflected SH-wave by Goos-Hnchen effect at an interface of strata

作　　者：刘福平[1,2] 王安玲[1] 李瑞忠[3] 陈辉国[2] 杨长春[2] 

机构地区：[1]北京印刷学院,北京102600 [2]中国科学院地质与地球物理研究所,北京100029 [3]中国石油化工集团公司经济技术研究院,北京100029

出　　处：《地球物理学报》2009年第8期2128-2134,共7页Chinese Journal of Geophysics

基　　金：国家自然科学基金(10705049);北京市自然科学基金(1083011);北京市属市管高等学校人才强教计划项目资助

摘　　要：利用SH地震波(偏振化方向垂直入射面的横波)在地层界面反射系数的附加相角导出了SH波GoosHnchen效应所引起的横向偏移和横向偏移渡越时间,给出了Goos-Hnchen效应正常时差公式,讨论了Goos-Hnchen效应对反射SH波正常时差的影响,绘出了横向偏移、横向偏移渡越时间、Goos-Hnchen效应正常时差及Goos-Hnchen效应正常时差校正量曲线.数值算例表明:对掠入射波或入射角在临界角附近的入射波,SH反射波的横向偏移、横向偏移渡越时间非常大,Goos-Hnchen效应对正常时差会产生较大的测量误差,在其他角度的入射波,横向偏移(横向偏移渡越时间)与波长(周期)为同一个数量级.横向偏移效应对SH反射波的传播走时影响是不可忽略的,因此在实际的地震资料处理中应进行横向偏移效应误差校正.Using the phase shift of reflection coefficient of SH seismic wave at the interface of strata, we derived the lateral shift and group time delay of total reflected SH seismic wave, given formulae of normal moveout of Goos-Hanchen effect, discussed the influence of Goos-Hanchen effect on normal moveout of SH-wave, and drawn the curves of lateral shift, group time delay, normal moveout of Goos-Hanchen effect and error of normal moveout caused by Goos-Hanchen effect with respect to the angle of incidence. The results show that for glancing wave or angle of incidence being near the critical angle, the lateral shift and group time delay are very large. A large error can be caused by Goos-Hanchen effect; In other angle of incidence the lateral shift（group time delay） is the same order of magnitude as the wavelength （period）; So Goos-Hanchen effect can bring about large influence on the travel time of SH-wave. The error correction of Goos-Hanchen effect should be made before seismic data processing.

关 键 词：Goos-Hnchen效应 SH地震波 横向偏移 正常时差 横向偏移渡越时间 

分 类 号：P631[天文地球—地质矿产勘探]