F-K反偏移中的插值映射  

Interpolation Mapping in F-K Demigration

作　　者：张东良[1] 孙建国[1] 

机构地区：[1]吉林大学地球探测科学与技术学院/应用地球物理综合解释理论开放实验室,长春130026

出　　处：《吉林大学学报（地球科学版）》2009年第4期749-754,共6页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(40574052)

摘　　要：均匀介质中的F-K反偏移是实现一般介质下F-K反偏移的基础,而均匀介质中的F-K反偏移的实质是一个插值映射过程。根据插值对象为复函数的特点,采用了实部虚部分别插值、去振荡因子法、模和相位分别插值、直接频率域插值4种插值方法对点脉冲模型进行了试算。结果表明:截断的直接频率域插值在适应性和精度综合衡量下为最佳;去振荡因子法精度虽高,但可应用的模型太具理想,不适合一般模型中的应用;实部虚部分别插值与模和相位分别插值两者精度较低。F- K demigration in media with constant velocity is the basis of the F- K demigration in inhomogeneous media. The essential of F - K demigration in constant velocity media is a process of mapping by interpolation. Since the function to be interpolated is a complex function, the authors present four interpolation methods, namely separate interpolation for the real and the imaginary part, interpolation after removing the oscillatory factor, separate interpolation for the module and phase, and interpolation directly in the frequency domain. Numerical results show that interpolation directly in the frequency domain gives the optimal results. Although the interpolation after removing the oscillatory factor has a high accuracy, it can be used only for models with ideal parameters. Both the method of separate interpolation for the real and the imaginary part and the method of separate interpolation for the module and phase have low accuracy.

关 键 词：F-K反偏移 插值映射 频率域插值 

分 类 号：P631.4[天文地球—地质矿产勘探]