水平两层均匀介质中井下电阻率观测信噪比的理论计算

在点电源水平两层均匀介质模型下计算了在不同地电断面中观测时地表干扰电流源对观测的影响。得到:地表干扰电流源对地电阻率观测电势差的影响取决于地电断面类型和参数、供电电极和测量电极的埋深以及避开干扰源的距离。本文研究结果对实施井下电阻率观测中台址电性结构选择、电极埋深、干扰源避让有参考意义。

Theoretical Calculation for the Signal Noise Ratio of the Underground Electric Resistivity Observation in the Two-layered Horizontal Homogeneous Medium

In the model of homogeneous medium of two horizontal layers,the effect caused by disturb current on surface when observing the geo-electric resistivity in different geo-electric sections is calculated.The result shows that the effect caused by disturb current is determined by the type and parameters of geo-electric section,the distance from electrodes to disturb current and the depth of electrodes.The result of this article may be used as a reference when choosing the electric structure under stations,determining the depth of electrodes and escaping from disturb current.