高密度电法在水文地质中的应用

Application of high density resistivity method in hydrogeology

高密度电法是电阻率电法的一种,它通过人工场源建立地下稳定电场,再通过该稳定场的分布规律来研究各种地质问题.在工作中,高密度电阻率法通常有3种装置类型可供选择,即温纳装置、偶极装置和微分装置.结果分析时,一般采用电阻率直接解译.另外,当使用多种电极系进行数据采集时,还可以用比值参数法对结果进行分析.通过研究不同装置的高密度电法剖面,采取不同的数据处理方式,实例分析了3种装置在探测地下介质含水性的差异.结果表明,偶极和微分装置的探测结果对于异常的反映相似,温纳装置更适合于探测电性界面变化较小的情况,比值参数的处理方法能够更加清晰地显示异常体的几何形状.

High density resistivity method is one of the resistivity methods, which is designed to investigate geological problems through manual steady electric field. It often has three types of electrode arrangement for HDRM, i.e. Wenner arrangement, dipole array and differential array. It is usually to study the field data with resistivity unite. Whereas, if more than two electrode arrangements adopted in the field works, a ratio parameter of resistivity can also be employed in analysis procedure. All of the three types of elec- trode arrangement were used to investigate hydrogeological diversity in the case study, and the ratio parameter of resistivity was adopted comparing with resistivity in the analysis. It concludes that DP and DI have similar results, and WN is more appropriate for investigating flat stratum. It also shows that ratio parameter of resistivity can highlight more details of anomaly.