江宁地电台的电性结构及关于地电阻率观测值的解释

Electrical structure and its application to the explanation of georesistivity observations at Jiangning geoeletric station

为了探究地表和井下观测的地电阻率值存在的明显差异,本文首先对江宁地电台电性结构进行了探测,并建立了水平层状电性结构模型;然后基于该模型计算了地表和井下观测装置的理论视电阻率值;最后对比分析计算值与观测值。结果表明,地表大供电极距观测装置和井下观测装置的观测值均可以由地下电性结构进行合理解释,即地表与井下观测值的差异是合理的,是由地下电性结构所决定的。

In order to probe the significant difference between the surface and deep well georesistivity observations,the electrical structure beneath Jiangning geoelectric station was detected,and a horizontally layered electrical structure model was proposed in this paper. Subsequently,we used the model to calculate the apparent resistivity for each configuration of surface and deep-well observation systems. Comparison of calculated georesistivities,with observed ones shows that the observations of the surface configurations with a long-distance current electrodes and those of deep-well configurations can be reasonably interpreted,that is to say,the difference between the surface and deep-well observations is reasonable,which is resulted from the different electrical structure beneath Jiangning station.