高密度电阻率法三种不同装置应用效果对比研究

Comparative Study on the Application Effect of Three Different Devices of High Density Resistivity Method

高密度电阻率法作为一种阵列式电法勘探方法,通过改变供电、观测电极的排列方式,可实现多种排列装置进行数据采集的功能,具有低成本、高效率的特点,已广泛应用于环境地质、工程地质和矿产地质等领域。为探究在不同地质背景、勘探目标时,各排列装置应用效果的特点,本文选取温纳、偶极—偶极和施伦贝谢尔(剖面)三种装置,对其在水库坝体渗漏检测和地下水勘查中的应用效果进行对比,研究各排列装置的特点。结果表明,温纳装置在勘探深度方面有明显的优势,纵向分辨率高,施工效率高,数据拟合效果好,信噪比高,抗干扰能强;偶极—偶极装置横向分辨率高,水平方向异常更细化,施工效率较高;施伦贝谢尔(剖面)装置具有较高的横向与纵向分辨率,采集数据点多,获取地电断面信息更丰富,抗干扰能力较强,勘探深度较深,数据拟合效果较好。综合对比研究认为,施伦贝谢尔(剖面)装置适宜在水库坝体渗漏检测中推广使用;温纳装置具适宜在勘探第四系潜水含水层中推广使用。

As an array electrical exploration method,high density resistivity method can realize the function of data acquisition with various arrangement devices by changing the arrangement of power supply and observation electrodes.It has the characteristics of low cost and high efficiency,and has been widely used in the fields of environmental geology,engineering geology and mineral geology.In order to explore the characteristics of the application effect of each arrangement device in different geological backgrounds and exploration targets,three kinds of devices,such as Wenner,dipole—dipole and Schlumberger(section)are selected in this paper to compare their application effects in the seepage detection of reservoir dam and groundwater exploration,and to study the characteristics of each arrangement device.It is showed that Wenner device has obvious advantages in exploration depth,high longitudinal resolution,high construction efficiency,good data fitting effect,high signal-to-noise ratio and strong anti-interference ability.The dipole—dipole device has high lateral resolution,more detailed horizontal anomalies,and higher construction efficiency.The Schlumberger(profile)device has higher transverse and longitudinal resolution,more collected data points,richer obtained geoelectric section information,stronger anti-interference ability,deeper exploration depth,and better data fitting effect.It is concluded that Schlumberger(profile)device is suitable to be applied in seepage detection of reservoir dam,Wenner device is suitable to be used in exploration of quaternary aquifer.