弹性各向异性介质速度特征分析  

The Analyse of Velocity Feature of Elastic Anisotropic Media

作　　者：韩颜颜[1,2] 郭智奇[1] 刘财[1] 冯晅[1] 丁大军[2] 

机构地区：[1]吉林大学地球探测科学与技术学院,长春130026 [2]吉林大学原子与分子物理研究所,长春130012

出　　处：《吉林大学学报（地球科学版）》2008年第S1期80-84,共5页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(40574042);国家油气专项(XQ-2004-07-05)

摘　　要：通过理论模型计算,分析Thomsen各向异性参数ε和δ对弹性各向异性VTI介质中qP和qSV波的相速度和群速度的影响,结果表明,qP波大角度和中小角度传播时的各向异性性质分别由参数ε和δ来决定,qSV波中等角度传播时的各向异性性质主要由(ε-δ)决定。各向异性参数变化时,群速度的各向异性要比相速度的各向异性更明显,qSV波的群速度比qP波形态复杂,呈现复杂的交会区。The effects of Thomsen anisotropic parameters ε、δ on phase and group velocities of qP-wave and qSV-wave in the elastic anisotropic VTI media have been investigated by computing according to models.The result reveals the characters of qP-wave at larger,intermediate and smaller angles depend on ε、δ,respectively,and that of qSV-wave at intermediate angles are mainly decided by(ε-δ).The anisotropy of group velocity which may represent cusps is more obvious than that of phase velocity according to different anisotropy parameters.

关 键 词：各向异性 相速度 群速度 

分 类 号：P631.4[天文地球—地质矿产勘探]