摘要
为了了解可控源音频大地电磁法中磁探头摆放位置对卡尼亚视电阻率的影响特征,在均匀半空间地面水平电偶极子源的波区电磁场中,推导出了卡尼亚视电阻率的相对误差公式。在给定参数的情况下,分磁探头仅存在水平方向偏差、垂直方向偏差和综合方向偏差三种情况讨论了对卡尼亚视电阻率的影响特征,通过计算,上述三种情况的卡尼亚视电阻率的相对误差最大值分别为170%、7%和190%,且磁探头仅存在水平方向偏差对卡尼亚视电阻率的影响比磁探头仅存在垂直方向偏差对卡尼亚视电阻率的影响显著。
The relative error formula of the Cagniard resistivity was calculated so as to know the influence of the the location of the an- tenna laid in CSAMT on the Cagniard resistivity, which was based on the wave zone of the electromagnetic fields in the homogeneous half-space ground caused by the horizontal electric dipole source. In the case of given parameter, three models of the antenna devia- tions, i.e. , horizontal deviation, vertical deviation and comprehensive deviation, were built, and the characteristics of the influence of each model on Cagniard resistivity were discussed. The maximum relative errors of these models on Cagniard resistivity are 170%, 7% and 190% respectively. In addition, the influence of the antenna horizontal deviation of the antenna on Cagniard resistivity is more ob- vious than that of the vertical deviation.
出处
《物探与化探》
CAS
CSCD
2013年第3期521-523,共3页
Geophysical and Geochemical Exploration
