A study on FEM modeling of anomalies of 3-D high-density E-SCAN resistivity survey
三维高密度电阻率ESCAN法有限元模拟异常特征研究

Geological bodies of small buried depths,small sizes,and complex distribution are often needed to be explored in engineering electric prospecting.Higher accuracy of detective methods is required.Using the(3-D) high-density resistivity method,which is one of the normal methods in engineering prospecting,we can get plenty of data and detect the bodies in many bearings.A study of anomaly features in 3-D high-density E-SCAN resistivity survey is done in this paper.Several classical models are designed and calculated using the finite element method to study their anomalous features.The results show that,the resolving power of E-SCAN on low resistivity bodies is stronger than on high resistivity bodies.It dispenses with setting power on all electrodes and can distinguish geologic body's electrical properties and positions.But it is difficult to identify the downward extention of geological bodies by the measurements.