电法在日照市丘陵区找水中的应用

Application of Electricity in Groundwater Exploration in Hilly Areas in Rizhao City

电法勘探在寻找浅层地下水时,主要利用含水地质体与围岩的电阻率差异来间接找水,通过综合分析日照市不同地下水类型50余例物探找水定井资料,总结了其含水层的测深曲线特征,若围岩为高阻,则含水层曲线特征表现为平缓上升或变异下降;若围岩为低阻,则含水层曲线特征为明显上升段。对于含水性特征不明显的,开展激发极化法多参数测量,依据视极化率、半衰时等参数综合判断。对于日照市丘陵区松散岩类孔隙水、基岩裂隙水和构造裂隙水的不同电性特征,选择利用联合剖面法寻找含水构造,多参数激电测深法确定储水构造位置,经验系数法推断富水地层深度,能够快速、高效的确定井位,为今后日照市丘陵区的找水工作提供了经验。

When searching for shallow groundwater,indirect water exploration is mainly made by using the difference of resistivity between water-bearing geological bodies and the surrounding rocks.Through analyzing more than 50 water finding well logging data gained from different groundwater types in Rizhao city,characteristics of sounding curve of water-bearing layers have been summarized.If the surrounding rocks have high resistivity,the characteristics of aquifer curve show gentle rise or decline;if the surrounding rocks have low resistivity,the aquifer curve characteristics are obvious ascending section.For the water bearing characteristics are not obvious,multi-parameter measurement by using polarization method has been carried out.According to apparent polarization and half-time parameters,comprehensive estimation has been carried out.Pointing to different electrical characteristics of loose rock pore water,bedrock fissure water and tectonic fissure water in hilly area in Rizhao city,the composite profiling method has been used to deternine water structures,the IP sounding method has been used to determine the location of groundwater-bearing structures,and empirical coefficient method has been used to determine the depth of water-rich stratum.It can quickly and efficiently determine the well location and provide experiences for searching for water in the future in hilly area in Rizhao City.