Electrical resistivity data acquired in one hundred and ten (110) locations using vertical electrical sounding method of Schlumberger array have been used to study the hydrogeological properties and groundwater storage potential of bedrock aquifers in an area covered by Geological Sheet 223 Ilorin, Nigeria. The aim of the study was to identify productive aquifer zones for citing boreholes for community water supply. The data acquired were processed and interpreted using auxiliary curve matching and computer automation method to delineate the different geo-electric layers, their resistivities, thicknesses, and depths. Geo-electrical layers were interpreted to their equivalent geological layers using borehole lithological logs from the study area. Then, the hydraulic conductivity, transmissivity, fracture contrast, reflection coefficient were estimated and plotted in the form of 2D maps to describe the spatial variations of these parameters in the area. The results of the study revealed the presence of three to five geo-electric layers. The geo-electric layers, from top to the bottom, corresponds to the topsoil layer, lateritic layer, weathered rock layer, fractured rock layer, and the fresh basement rock. Lateritic and/or fractured rock layers were not delineated in some places. The weathered and fractured rock layers, where present, correspond to the aquifer units. The thickness of the fracture aquifer ranges from 0.6 to 33.6 m while the thickness of the weathered aquifer ranges from 1.4 to 49.3 m. The transmissivity, \( T \), and hydraulic conductivity, \( K \), range from 3 to 1200 m²/day and 1 to 48 m/day, respectively. The reflection coefficient and fracture contrast map showed the presence of water-bearing fractures and shared some similarities with T and K maps. A mathematical model for predicting groundwater potential, \( {\text{GW}}_{\text{P}} \), of weathered aquifer in the basement complex terrain was proposed in this study. The consistencies between the overall groundwater potential map and aquifers parameters distributions maps suggest the appropriateness of the proposed mathematical model for predicting groundwater potential of weathered rock in the basement complex area of Nigeria. The western, northwestern, and central parts of the study area, having \( {\text{GW}}_{\text{P}} \) greater than 0.6 (60%), were recommended for groundwater development through boreholes drilled to a depth ranging between 75 and 100 m.

中文翻译：

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利用地电测深仪评估尼日利亚伊洛林223号地质表中基岩含水层的地下水潜力

使用斯伦贝谢阵列的垂直电测深法在一百（110）个位置获得的电阻率数据已用于研究尼日利亚地质表223伊洛林所覆盖区域的基岩含水层的水文地质特性和地下水储存潜力。该研究的目的是确定生产性含水层区域，以引用钻孔来为社区供水。使用辅助曲线匹配和计算机自动化方法对获取的数据进行处理和解释，以描绘出不同的地电层，其电阻率，厚度和深度。利用研究区域的钻孔岩性测井资料将地电层解释为等效的地质层。然后，水力传导率，透射率，断裂对比度，估计反射系数并以2D映射的形式绘制以描述该区域中这些参数的空间变化。研究结果表明存在三到五个地电层。地电层从上到下分别对应于表土层，红土层，风化岩层，裂隙岩层和新鲜基底岩。在某些地方未划定红土层和/或断裂层。存在的风化和破裂岩石层对应于含水层单位。裂缝性含水层的厚度为0.6至33.6 m，而风化含水层的厚度为1.4至49.3 m。透射率 研究结果表明存在三到五个地电层。地电层从上到下分别对应于表土层，红土层，风化岩层，裂隙岩层和新鲜基底岩。在某些地方未划定红土层和/或断裂层。存在的风化和破裂岩石层对应于含水层单位。裂缝性含水层的厚度为0.6至33.6 m，而风化含水层的厚度为1.4至49.3 m。透射率 研究结果表明存在三到五个地电层。地电层从上到下分别对应于表土层，红土层，风化岩层，裂隙岩层和新鲜基底岩。在某些地方未划定红土层和/或断裂层。存在的风化和破裂岩石层对应于含水层单位。裂缝性含水层的厚度为0.6至33.6 m，而风化含水层的厚度为1.4至49.3 m。透射率 在某些地方未划定红土层和/或断裂层。存在的风化和破裂岩石层对应于含水层单位。裂缝性含水层的厚度为0.6至33.6 m，而风化含水层的厚度为1.4至49.3 m。透射率 在某些地方未划定红土层和/或断裂层。存在的风化和破裂岩石层对应于含水层单位。裂缝性含水层的厚度为0.6至33.6 m，而风化含水层的厚度为1.4至49.3 m。透射率\（T \）和水力传导率\（K \）分别为3至1200 m ² /天和1至48 m /天。反射系数和裂缝对比图显示了含水裂缝的存在，并且与T和K图有一些相似之处。预测地下水潜力的数学模型\（{\ text {GW}} _ {\ text {P}} \）这项研究提出了地下复杂地形中的风化含水层。整体地下水潜力图和含水层参数分布图之间的一致性表明，所提出的数学模型对于预测尼日利亚地下复杂区域中风化岩石的地下水潜力的适用性。建议研究区域的西部，西北部和中部\（{\ text {GW}} _ {\ text {P}} \）大于0.6（60％），以通过钻至深度在75至100 m之间。