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。
Abstract:
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.
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