An integrated approach involving geophysical and physicochemical methods was undertaken to assess the potential availability of groundwater and its quality was carried out at Akole, Abeokuta Southwestern Nigeria. A combination of electrical resistivity and natural electric field methods were used in delineating the sub-surface lithology, determining potential groundwater-bearing zones, and the potential availability of groundwater for a community water supply. Laboratory analyses of samples from existing wells in the area was also carried out to determine the groundwater quality index (GWQI). Four vertical electrical sounding (VES) stations and nine profiles were surveyed using the Omega Campus and PQWT 150 instruments, respectively. The VES results delineated a maximum of five geo-electric sub-surface layers. A sudden change in the stratigraphy view of the rock formation from soft to very hard formation was observed in profile map L2. Profile map L7 and VES 2 has the highest potential for future groundwater exploration. Areas under VES 3 and profile maps L2, L3, L4, L5, L6, L8 and L9 are categorized as having a “medium” groundwater potential while the low yield water potential are areas under VES 1 and 4 and, profiles maps L1 and L10. The majority of groundwater in the weathered/fractured aquifer of the study area is slightly acidic. The GWQI values were less than 100, an indication that the analysed water samples fall within the “excellent” and “good” quality categories, implying that the groundwater is fit for domestic purposes. A combination of geophysical and physicochemical techniques has been successfully used to provide useful information for the assessment of groundwater potential and quality of the community.

中文翻译：

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使用地球物理和物理化学方法对尼日利亚西南部地下室地形中地下水潜力和水质的评估

在尼日利亚西南部阿贝库塔（Abeokuta）的阿科乐（Akole），采用了涉及地球物理和物理化学方法的综合方法来评估地下水的潜在可用性，并评估了地下水的质量。电阻率法和自然电场法相结合，用于描述地下岩性，确定潜在的含地下水区以及为社区供水提供潜在的地下水。还对该区域现有井中的样品进行了实验室分析，以确定地下水质量指数（GWQI）。使用Omega Campus和PQWT 150仪器分别测量了四个垂直电子测深（VES）站和九个剖面。VES结果描述了最多五个地电次表层。在剖面图L2中观察到岩层的地层学视图从软地层到非常硬地层的突然变化。剖面图L7和VES 2具有未来地下水勘探的最大潜力。VES 3下的区域和剖面图L2，L3，L4，L5，L6，L8和L9被归类为具有“中”地下水位，而低产水势是VES 1和4下的区域，剖面图L1和L10 。研究区风化/破裂的含水层中的大部分地下水是弱酸性的。GWQI值小于100，这表明所分析的水样属于“优良”和“良好”质量类别，这意味着地下水适合生活用水。