摘要
本文用各向异性反射率法计算爆破源反射地震的理论地震图。对比了各向同性介质的反射记录，讨论了水平叠层各向异性和裂隙各向异性对体波三分量记录特征的影响。结果表明，裂隙各向异性导致转换横波分裂，并使横向记录分量出现波动。这种转换横波的分裂和快渡偏振方向的定向性难以用各向同性和水平横向各向同性传播来模拟。由此提出，爆破源反射地震三分量记录中横向记录剖面上出现的可连续追踪的转换波是探测介质方位各向异性的一个重要标志。
Theoretical reflection seismograms in dynamite source condition are formed by using anisotropic reflectivity method. By comparing them with the reflection seismograms in isotropic medium, authors analyse how characters of three-component body wave record are affected by horizontal lamination anisotropy and fracture anisotropy. It is shown that fracture anisotropy results in splitting of converted shear wave and brings wave in transverse component record. Both splitting of converted shear wave and directionality of fast wave polarization can hardly be modeled by isotropy and horizontal transverse isotropic propagation. We can say then that the continuous converted shear wave appearing in transverse component of threecomponent reflection records in dynamite source condition is an important indication for knowing azimuthal anisotropy of medium.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
1999年第2期210-217,共8页
Oil Geophysical Prospecting
基金
国家自然科学基金
中国石油天然气总公司重点科技项目
关键词
爆破源
地震勘探
三分量记录
地震反射波
地震图
dynamite source, azimuthal anisotropy, fracture anisotropy,three-component record, reflective converted wave, polarization
