Estimation of aquifer properties allows quantitative prediction of the hydraulic response of the aquifer to recharge and discharge. However, conventional methods such as pumping tests, among other limitations, are costly and time-consuming. Thus, this study aims to estimate hydraulic properties of basement aquifers of the Idi-Ishin area of Ibadan, southwest Nigeria using an indirect electrical resistivity technique. Sixty-two (62) vertical electrical soundings (VES) were carried out along eleven (11) E-W established traverse lines with a view to intercepts the fracture systems. The acquired resistivity data were subsequently interpreted using computer software, IP12WIN, for iteration and generated layered parameters. Layer parameters were further evaluated to derive the Dar–Zarrouk parameters such as longitudinal conductance (S) and transverse resistance (R) to estimate the aquifers transmissivity (T) and hydraulic conductivities (H). Pumping test was performed, and the hydraulic conductivities and transmissivities determined were correlated with the calculated values from the electrical sounding data. The subsurface geophysical investigation revealed three to four-layer systems; topsoil, weathered-partially weathered basement, fractured basement and fresh basement. The weathered-fractured basement at varied depths serves as shallow groundwater aquifers. The computed T and H ranged from 9.69 × 10^–2 to 1.71 × 10^–1 m²/day and 9.13 × 10^–3 to 1.86 × 10^–2 m/day which give a good relationship with the respective in-situ values from 2.46 to 6.15 × 10^–1 m²/day and 1.88 × 10^–2 to 4.70 × 10^–3 m/day. S and R vary between 0.014 and 0.714 Ω⁻¹ and 84.48–30,112.57 Ωm², revealing a poor to good recharge and huge aquifer thickness. Also, longitudinal resistivity (LR) and transverse resistivity (TR) range from 12.3 to 242.7 Ωm⁻¹ and 20,333.1–106.5 Ωm⁻¹ an indicative of variation in the basement lithology as coefficient of anisotropy (λ) vary from 2.1 to 14.9, reflecting differences in basement characteristics for direction of fluid motion and accumulation. This study supports using electrical resistivities measurement to determine aquifer hydraulic conductivities, transmissivities, and protective capacity.

含水层特性的估计允许定量预测含水层对补给和排放的水力响应。然而，除其他限制外，诸如泵送测试之类的传统方法成本高且耗时。因此，本研究旨在使用间接电阻率技术估算尼日利亚西南部伊巴丹 Idi-Ishin 地区基底含水层的水力特性。沿着十一 (11) 条 EW 建立的导线进行了六十二 (62) 次垂直电测深 (VES)，以拦截裂缝系统。随后使用计算机软件 IP12WIN 解释获得的电阻率数据，以进行迭代并生成分层参数。进一步评估层参数以推导出 Dar-Zarrouk 参数，例如纵向传导率 (S) 和横向阻力 (R)，以估算含水层的传导率 (T) 和水力传导率 (H)。进行了抽水试验，确定的水力传导率和透射率与电测深数据的计算值相关联。地下地球物理调查揭示了三到四层系统；表土、风化-部分风化基底、破裂基底和新鲜基底。不同深度的风化破裂基底作为浅层地下水含水层。计算出的 T 和 H 范围为 9.69 × 10 确定的水力传导率和透射率与电测深数据的计算值相关联。地下地球物理调查揭示了三到四层系统；表土、风化-部分风化基底、破裂基底和新鲜基底。不同深度的风化破裂基底作为浅层地下水含水层。计算出的 T 和 H 范围为 9.69 × 10 确定的水力传导率和透射率与电测深数据的计算值相关联。地下地球物理调查揭示了三到四层系统；表土、风化-部分风化基底、破裂基底和新鲜基底。不同深度的风化破裂基底作为浅层地下水含水层。计算出的 T 和 H 范围为 9.69 × 10^–2至 1.71 × 10 ^–1 m ² /天和 9.13 × 10 ^–3至 1.86 × 10 ^–2  m/天，这与 2.46 至 6.15 × 10 ^–1 m ² /的各个原位值具有良好关系天和 1.88 × 10 ^–2至 4.70 × 10 ^–3  m/天。S 和 R 在 0.014 和 0.714 Ω ^-1和 84.48-30,112.57 Ωm ²之间变化，表明补给差到好和含水层厚度大。此外，纵向电阻率 (LR) 和横向电阻率 (TR) 的范围为 12.3 至 242.7 Ωm ^-1和 20,333.1-106.5 Ωm ^-1各向异性系数 (λ) 从 2.1 到 14.9 不等，反映了基底岩性变化的指标，反映了流体运动和聚集方向的基底特征差异。本研究支持使用电阻率测量来确定含水层水力传导率、传输率和保护能力。