粘弹性VTI介质地震波模拟特征分析  

The analysis of the wave field characteristics in viscoelastic VTI medium

作　　者：谭未一[1] 赵兵[2] 张中杰[2] 

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院 [2]中国科学院地质与地球物理研究所,北京100029

出　　处：《地球物理学进展》2007年第4期1305-1311,共7页Progress in Geophysics

基　　金：中石化科技部项目(P05043)资助

摘　　要：本文首先利用有限差分法分别对弹性和粘弹性VTI介质进行地震波传播数值模拟,并针对波场快照和波场记录特征,分析不同品质因子组合对波场能量衰减和频率吸收作用的影响.结果表明:对应于膨胀滞弹性形变的品质因子变化主要影响qP波的能量衰减;对应于剪切滞弹性形变的品质因子变化主要影响qSV波的能量衰减;对于qSH波,两个品质因子分别对应于垂直和水平方向的能量衰减;品质因子较小时,qSV波和qSH波的频率向低频方向移动,qP波频率变化不明显.In this paper, we firstly simulate wave field propagation in elastic and viscoelastic VTI medium used by finite difference scheme, then analysis wave field snap and wave field record characteristics. Through comparing and analysis effects of energy attenuation and frequency absorption related to different Q factor pair, we obtained these resuits as follows： The Q factor related to dilation anelastic deformation affect energy attenuation of qP wavel The Q factor relation to shear anelastic deformation affects energy attenuation of qSV wave; To SH wave, the two Q factors indicate attenuation in vertical and horizontal direction respectively; The effect of Q factor to qSV wave and qSH wave is bigger compare to qP, when Q factor is small, the former frequency tend to low frequency, but the frequency various of the latter is not obvious.

关 键 词：VTI介质 有限差分 波场模拟 品质因子 

分 类 号：P315[天文地球—地震学] P631[天文地球—固体地球物理学]