加纳Tarkwa矿区地下水综合电阻率成像和电磁测量研究

J. Seidu, A. Ewusi, J. Kuma
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引用次数: 10

摘要

塔克瓦的主要饮用水来源是来自邦萨河的邦萨处理厂。在邦萨河沿岸非法采矿的活动造成了该河的污染。这导致了高昂的处理费用和不定期地向塔尔克瓦镇和周围社区供水,这些社区由邦萨处理厂供水。鉴于难以获得经常和定期的饮用水供应,人们采取了打井和手挖井的办法。然而,成功率和钻孔产量很低,特别是在Tarkwa地区水文地质困难的地形中。本文的目的是利用电阻率成像(ERI)和电磁(EM)地球物理技术对塔卡瓦地区的水文地质条件进行研究,确定与地下水聚集有关的电阻率和电导率值,从而确定潜在的含水带。电阻率计算结果表明,塔克瓦地区的电阻率总体分布在32 Ωm ~ 10 000 Ωm之间。湖尼砂岩含水层深度为35 m,平均电阻率为400 Ωm;塔克瓦千层岩含水层深度为60 m,平均电阻率为600 Ωm; Banket系列含水层深度为55 m,平均电阻率为600 Ωm;卡瓦砾岩含水层深度为50 m,平均电阻率为500 Ωm。电磁电导率值也表明,塔克瓦地区的总体电导率分布为3 ~ 32s /m。电阻率法和电磁法的成功率分别为80%和65%。结合这两种技术,成功率提高了86%。关键词:电阻率成像电磁法地下水
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Combined Electrical Resistivity Imaging and Electromagnetic Survey for Groundwater Studies in the Tarkwa Mining Area, Ghana
The major source of potable water in Tarkwa is the Bonsa Treatment Plant sourced from the Bonsa River. The activities of illegal miners along the banks of the Bonsa River has resulted in pollution of the river. This has resulted in high treatment cost and irregular supply of water to the Tarkwa Township and surrounding communities that are fed by the Bonsa Treatment Plant. In view of the difficulty in getting frequent and regular potable supply of water, people have resorted to construction of boreholes and hand-dug wells. However, the success rates and borehole yields are low especially in the hydrogeologically difficult terrains in the Tarkwa area. The aim of this paper is to investigate the hydrogeological conditions of the Tarkwa area using both the Electrical Resistivity Imaging (ERI) and Electromagnetic (EM) geophysical techniques to determine the electrical resistivity and conductivity values that are related to groundwater accumulation, so that potential water-bearing zones can be identified. Results from electrical resistivity show that the general resistivity distribution in the Tarkwa area is between 32 Ωm and 100 000 Ωm. Water-bearing zones in the Huni Sandstone occur to a depth of 35 m with an average resistivity value of 400 Ωm, at a depth of 60 m and a resistivity of 600 Ωm in the Tarkwa Phyllite, at a depth of 55 m and a resistivity of 600 Ωm in the Banket Series and 50 m depth with resistivity value of 500 Ωm in the Kawere Conglomerate respectively. The electromagnetic conductivity values also show that the general conductivity distribution in the Tarkwa area is 3 – 32 S/m. The application of electrical resistivity and electromagnetic techniques separately gives success rate of 80 % and 65 % respectively. An improved success rate of 86 % is achieved combining the two techniques. Keywords: Electrical Resistivity Imaging, Electromagnetic Method, Groundwater
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