井地电法不同供电方法对地表电场的影响

Influence on surface electric field by different supply methods of borehole-surface electrical method

为研究线源和点源供电方法的差异,在实验室利用水槽建立物理模型。由于水相对于油层而言呈低阻特征,因此试验中用铜板模拟低阻体,用铜棒模拟线电源供电,铜柱模拟点电源供电,改变低阻体与供电电源的相对位置,测试表面电位的空间分布,从而分析驱油介质(水)的空间分布。实验结果表明,不同的电源供电方法可以表现出不同的电场特性,线电源供电方法对电场的影响较大,对低阻体的识别效果较差,而点电源供电方法用于低阻体的识别和监测效果较好。

In order to investigate the difference between the line power supply and the point power supply,the authors establish a physical model in the laboratory using a sink.Since the water has low resistance relative to the oil,in the experiment,copper plate is used to analog the low resistance body,copper rod is used to analog line power supply,copper column is used to analog point power supply.By changing the relative position of low resistance body and power supply,the spatial distribution of the surface potential is tested to analyze the spatial distribution of the oil displacing medium（water）.The experimental results show that different power supply methods illustrate different electric field characteristics,of which the line power supply method has a greater impact on the electric field,with poor recognition effect on the low resistance body,whereas the point power supply method shows better effect on identifying and monitoring the low resistance body.