含油污水污染地下介质的电性异常模拟及实例分析

为了提高电阻率法对地下介质污染问题的探测能力，分析了含油污水污染地下介质后引起的导电性变化，建立了适用于该问题分析的地电模型。利用2.5维有限元的方法正演模拟了采用温纳、施龙贝格、偶极和二极装置监测时所得的典型电异常剖面。正演模拟结果显示不同装置对污染区的反映能力不同，相对而言施龙贝格和温纳装置对污染区分布的反映较为直观。饱和粘土的含油污染区用温纳装置测量,剖面上表现为相对高阻异常特征，异常区域分布和污染通道相吻合。应用实例也证实了这一分析。

The Electrical Resistivity Anomaly Simulation of Soil Layer Contaminated with Oil Sewage and a Case Study

In order to improve the detecting capability for soil layer contaminated with oil sewage, the resistivity changes of soil layer, prior to and after the contamination, were analyzed. A geoelectrical resistivity model is established for such resistivity change analysis. The resistivity anomaly sections of Wenner, Schlumbeger, dipole-dipole and pole-pole array were calculated with 2.5-D finite element method (FEM). The forward results show that the detecting capabilities of different arrays are different from each other. Comparatively, Wenner and Schlumbeger array image better the contaminated area. The calculated results also show that the electrical resistivity of the contaminated saturation soil is higher in Wenner array, and the resistivity anomaly area matches the contaminated area. The field study also favors this analysis.