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.
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
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)
关键词
随机介质
单斜介质
尺度
方差
random media
monoclinic media
scale
variance
