基于随机各向同性背景的单斜介质二维三分量正演模拟  

2-D Three-Component Seismic Modeling for Monoclinic Media with Background of Random Isotropic Media

作　　者：王恩利[1] 韩立国[1] 唐启军[1] 刘乾坤[1] 廉玉广[1] 巩向博[1] 

机构地区：[1]吉林大学地球探测科学与技术学院,长春130026

出　　处：《吉林大学学报（地球科学版）》2008年第5期873-878,共6页Journal of Jilin University：Earth Science Edition

基　　金：国家"973"计划子课题(2007CB209603);国家"863"项目(2006AA062108)

摘　　要：针对满足Von Karman型椭圆自相关函数条件的随机各向同性背景下的单斜介质理论模型,应用交错网格技术对快照和地震记录进行模拟,所得结果清晰明了,发现在这种复合介质中波场特性既体现了规律性较强的单斜各向异性性质,又体现了介质的随机性特点。具体表现为:裂隙填充物的性质决定了qP波与qS波的各向异性特征,即干裂隙对qP波的影响显著大于qS波,而含水裂隙的情况则相反;相同方差条件下,尺度越小,随机介质干扰强度越大。The snap-shots and synthetic seismograms in monoclinic media with the background of the random isotropic media of Von Kraman pattern autocorrelation function are simulated by staggered grid finite difference.Numerical results show that wave field in the complex media reveals the characteristics of both monoclinic media and random media.And the properties of crack-filled materials determine the anisotropy of qP wave and qS wave;dry crack impacts qP wave more remarkably than qS wave,while opposite case for water-saturated crack;in the case of same variance,when the scale length became smaller,the disturbance caused by random media became stronger.

关 键 词：随机介质 单斜介质 尺度 方差 

分 类 号：P631.4[天文地球—地质矿产勘探]