摘要
各向异性介质主要表现为横向各向同性特征，而具有倾斜对称轴的横向各向同性介质更具有一般性。本文首先对横向各向同性介质进行分类；然后根据势能与坐标系无关的原理，推导出在一般坐标系下TI介质的弹性参数，这种方法适用于建立不同坐标系下弹性参数之间的相互关系；最后从各向异性介质中的波动方程出发，进行TI介质的相速度分析和波场正演模拟。计算结果表明，当对称轴倾斜时，介质在沿测线方向的错直平面内，均呈现出各向异性；当测线方向与走向垂直时，波前面两个对称轴的方向分别指示着介质对称轴的倾斜方向和垂直于对称轴的方向.
Anisotropic media mainly show transverse isotropic characteristics, and thetransverse isotropic media with dipping symmetric axis have very universal charac-teristics. The transverse isotropic media are classed into some types first. Then e-lastic parameters of TI media in common coordinate system are obtained in terms ofprinciple that potential energy is independent of coordinate system, this way is suit-ed to establish relations between elastic parameters in different coordinate systems.Finally, phase velocity analysis and wave field forward modeling in TI medium areachieved on the basis of wave equation in anisotropic medium. The results indicatethat medium is anisotropic in vertical plane along seismic line when symmetric axisslants, and that two symmetric axes of wavefront point respectively the dip direc-tion of medium symrnetric-axis and its normal direction when seismic line is perpen-dicular to trend.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
1998年第2期161-169,共9页
Oil Geophysical Prospecting
关键词
横向各向同性
弹性波
倾斜对称轴
地震勘探
transverse isotropy, elastic wave, TI medium, wave equation,slant symmetric axis, phase velocity analysis, wave field, elastic parameter, forward
