中文摘要：

根据准静态极限条件下，水平电偶极源在均匀半空间表面产生的r方向电场分量Er 表达式，分别在一维和三维条件下，对Er 进行数值模拟并迭代计算出相应视电阻率，讨论Er 的观测范围和应用优势。在一维条件下，通过对四种典型层状模型（两层D、G，三层H、K）的数值计算，并与相同条件下的Ex 视电阻率进行对比，结果表明：Er比Ex 受测量方位的影响更小；在三维条件下，选取均匀半空间存在异常体的模型，采用积分方程法对Er 进行数值计算，与相同条件下的Ex 视电阻率进行对比，结果表明：当均匀半空间存在低阻异常体时，Er 对低阻体y方向边界的反应比Ex 效果较好。

英文摘要：

Depending on the formula of electromagnetic field data from horizontal electric dipole under the quasi-static conditions, this paper deals with the measurement sector and advantages of electric field r-direction. Through numerical calculation of several typical layered models such as D, G, H and K, the Er apparent resistivity is compared with the Ex apparent resistivity under 1-D conditions. The result shows that the measuring position has less effect on Er apparent resistivity. Through numerical calculation of a single anoma-lous body existent in half-space by using the integral equation method, the Er apparent resistivity is compared with the Ex apparent re-sistivity under 3-D conditions. The result shows that the Er apparent resistivity has a better effect on the edge of the low-resistivity anom-alous body.