基于经验模态分解的大地电磁静校正方法  

MAGNETOTELLURIC STATIC CORRECTING METHOD BASED ON THE DECOMPOSITION OF EMPIRICAL MODALITY

作　　者：蔡剑华[1] 龚玉蓉[2] 

机构地区：[1]湖南文理学院信息研究所,湖南常德415000 [2]中南大学信息物理学院,湖南长沙423000

出　　处：《大庆石油地质与开发》2012年第1期163-166,共4页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家“863”计划（2006AA062105）、湖南文理学院博士启动基金、湖南文理学院优秀青年项目资助.

摘　　要：大地电磁测深法中的静态效应使实测的视电阻率和相位曲线发生畸变而导致反演解释错误，因此提出了基于经验模态分解（EMD）的大地电磁静校正方法。基于经验模态分解的多分辨特征分析得到电阻率或相位曲线的系列模式分量，再通过浅部（或局部）不均匀体和深部有一定规模的地质体在频率域选择曲线响应的不同模式分量进行重构，从而达到分离、抑制静态效应的目的。模型试算结果表明，经验模态分解校正静态效应能够消除视电阻率和相位曲线产生的畸变现象。In views of the wrong inversion interpretations resulted from the distortions of both actually tested apparent resistivity and phase curves caused by the static effect in the course of magnetotellurie depth measurement, the maguetotelluric correcting method is presented on the basis of empirical modal decomposition （ EMD）. The series pattern components of both resistivity and phase curves are obtained from the multiple identifying characteristic analysis of the EMD. And furthermore through reconstructing of different pattern components of the curve response chosen in frequency domain for both shallow （partial） heterogeneous bodies and deep geologic bodies, the aim of separating and attenuating the static effects can be realized. The trail calculation results of the model show that the static effect corrected by EMD can eliminate the distortions caused by apparent resistivity and phase curves.

关 键 词：静态效应 经验模态分解 大地电磁 静态校正 

分 类 号：P631[天文地球—地质矿产勘探]