吸收介质中射线路径,走时与振幅计算——基于一阶扰动方法  

Calculation of ray path,travel time and amplitude in absorbing medium based on the first-order perturbation method

作　　者：姜盼盼[1,2] 孙建国[1,2] 石秀林[1,2] 徐杨杨[1,2] 

机构地区：[1]吉林大学地球探测科学与技术学院,长春130026 [2]国土资源部应用地球物理综合解释理论实验室,长春130026

出　　处：《世界地质》2016年第1期250-255,共6页World Geology

基　　金：国家自然科学基金项目(41274120;41504084)资助

摘　　要：实际地层由于波前扩散、地层吸收和散射等原因发生衰减,为得到更加详细的地下信息和分辨率更高的图像,基于波前构建法的射线追踪,实现了吸收介质中对射线路径,走时与振幅的计算。计算表明吸收介质中的波动属性是复值;当Q为5~20时,衰减是可见的,明显的;而当Q〉30时,衰减微弱,为弱衰减介质。对吸收介质中的射线追踪进行计算,可提高地震波的分辨率,得到更清晰的地震记录。Because of the wavefront diffusion,formation absorption and scattering,the attenuation occurs in the actual formation. In order to get the detailed subsurface information and the higher resolution images from seismic data,based on wavefront construction method,the ray tracing in absorbing medium is realized,where the ray path,travel time and amplitude are calculated. The calculation shows that the volatility attributes in absorbing medium are complex values. When Q is 5 ~ 20,the attenuation is visible and obvious. When Q is greater than 30,the attenuation is weak,which is the weak attenuation medium. Consequently,it is important to calculate the ray tracing in absorbing medium for improving the resolution of seismic waves and obtaining clearer seismic records.

关 键 词：衰减 复值 波前构建 吸收介质 射线追踪 

分 类 号：P631.44[天文地球—地质矿产勘探]