摘要
大地电磁测深法 (MT)中的静态效应使实测的视电阻率和相位曲线出现畸变 ,导致反演解释得出错误的结果 .基于大地电磁测深响应在高频时具有一维响应特征 ,作者提出了对阻抗张量或实测的电场分量实施静态校正的方法 ,由高频的实测数据求取电场畸变张量和静态校正张量 ,而后对全频域的实测阻抗张量进行校正 ,以获得无静态干扰的张量 .实践结果表明 ,通过校正静态效应 。
The static migration in magnetotelluric sounding(MT) affects the qualitative and quantitative interpretation. The authors discuss the effect law of static migration to MT ground response parameters. It indicates that even the electric field style static distortion also can change the form of appearance resistivity curve and phase curve. Phase curve even appears over phase. The static migration also affects electric major axes and two dimensional diverge degrees. This made it difficult to respond to the geological meaning that it represented. It′s a very important step to make static migration correction in MT data processing. Or else we′ll obtain wrong inversion interpretation results. Based on the understanding that high frequency response of magenetotelluric sounding has one dimensional response characteristics, the authors put forward a static correction method to impedance tensor or measured electric field component, which first extracts electric field distort tensor and static correction tensor from the high frequency measured data, then correct the measured impendance tensor in full frequency in order to obtain correct tensor component without static migration. It is an effective method in actual application. It can not only reduce the distortion of appearance resistivity curve and phase curve affected by static migration, but also restore other magnetotelluric parameters data to normal.
出处
《中南工业大学学报》
CSCD
北大核心
2002年第1期8-13,共6页
Journal of Central South University of Technology(Natural Science)
关键词
静态效应
张量
电场畸形
静态校正
超相位
各向异性
static migration
tensor
electric field distortion
static correction
over phase
nonidentity
