水平电偶源r方向电场值应用的理论研究

THE THEORETICAL STUDY OF r-DIRECTION ELECTRIC FIELD VALUE APPLICATION OF THE HORIZONTAL ELECTRIC DIPOLE

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E r表达式,分别在一维和三维条件下,对E r进行数值模拟并迭代计算出相应视电阻率,讨论E r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E x视电阻率进行对比,结果表明:E r比E x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E r进行数值计算,与相同条件下的E x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,E r对低阻体y方向边界的反应比E x效果较好。

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.