Geoelectric Evaluation of Groundwater Potential: A Case Study of Sabongida-Ora and Environs, Southern Nigeria

Journal of Applied Sciences and Environmental Management

Chinyem, F.I.¹ 

关键词: Geoelectric;    groundwater potential;    Sabongida-ora;    lithologic heterogeneity;    confined aquifer;   

DOI  :  

学科分类：环境科学（综合）

来源: University of Port Harcourt * Department of Pure and Industrial Chemistry

【 摘 要 】

A d.c resistivity investigation for groundwater was carried out in Sabongida-Ora and its environs ofOwan West Local Government of Edo State. A total of seven vertical electrical sounding (VES) was carried out using theSchlumberger configuration with a maximum current electrode spacing ranging from 500- 650m. The data was interpretedusing conventional partial curve matching and computer aided iteration techniques. Seven hybrid curve types were deducedviz: KHAHQH, KHKHA, KHAKQQ, QQHKH, HKHAA, QHKHA, and KQHKQ. The results showed seven to eightgeoeletrical layers with resistivity values ranging from 127Ωm to 767Ωm, 47Ωm to 672Ωm, 70Ωm to 1380Ωm, 4Ωm to428Ωm and 21Ωm to 400Ωm for the first to eight layers respectively with lithologies consisting of clay, clayey sand andcoarse grained sand as indicating in the computed model parameters and geoeletrical section. From the geoelectric section,the area shows a vertical and lateral lithologic heterogeneity as a result of variation in depositional conditions which madeunit correlation between the VES stations difficult. Nevertheless, borehole lithologic logs were also correlated with thegeoelectric section and similar lithologies were observed. The section showed the occurrence of confined aquifer at a depthrange of 60-100m in some places and variable in other places. Results from both data revealed clay layers to be dominantin the study. It is therefore paramount to carry out a thorough geophysical investigation in any locality prior to sinking aborehole in order to forestall loses and to have productive wells.

【 授权许可】

Unknown