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<p>Geophysical logs and vertical electrical soundings (VES) were employed to define the subsurface layering and identify the water-bearing aquifer around Sagamu Interchange, Southwestern Nigeria, to evaluate their groundwater potential. Geophysical logs from eight wells and twenty-five Schlumberger soundings were acquired, processed and interpreted for aquifer characteristics. Log interpretation results identified one aquifer at depths ranging from 88 to 138&#xa0;m. The aquifer is characterized by porosity (55–60%) and total dissolved solids (1.1–1.9&#xa0;ppm). The VES indicated curve types AAK and AKQ, which are diagnostic of the deep occurrence of the saturated aquiferous unit. The geoelectric layers consist of topsoil (51–55 Ωm) with a thickness of 0.7 to 0.9&#xa0;m; the second layer, lateritic clay (153–1336 Ωm) with varying thickness (1.7–19.8&#xa0;m); the third, lateritic sand (223–3367&#xa0;Ωm) with a thickness range of 11.1–56.9&#xa0;m; and the fourth, dry sand with resistivity (1343–7270&#xa0;Ωm) and thickness ranging from 46.8 to 101&#xa0;m. The fifth layer represents the saturated sand aquifer (56–930&#xa0;Ωmm), the depth to the top of which varies from 88 to 138&#xa0;m. The significant depth required to penetrate the saturated aquifer makes access to the groundwater challenging, hence the ubiquity of failed boreholes in the area. This study furnishes information that enables access to elusive groundwater around the study area. </p>

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Geophysical evaluation of aquifer properties in the complex transition zone of Sagamu interchange, Southwestern Nigeria

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • S. Oladele,
  • B. R. Faleye,
  • O. O. Odubote

摘要

Geophysical logs and vertical electrical soundings (VES) were employed to define the subsurface layering and identify the water-bearing aquifer around Sagamu Interchange, Southwestern Nigeria, to evaluate their groundwater potential. Geophysical logs from eight wells and twenty-five Schlumberger soundings were acquired, processed and interpreted for aquifer characteristics. Log interpretation results identified one aquifer at depths ranging from 88 to 138 m. The aquifer is characterized by porosity (55–60%) and total dissolved solids (1.1–1.9 ppm). The VES indicated curve types AAK and AKQ, which are diagnostic of the deep occurrence of the saturated aquiferous unit. The geoelectric layers consist of topsoil (51–55 Ωm) with a thickness of 0.7 to 0.9 m; the second layer, lateritic clay (153–1336 Ωm) with varying thickness (1.7–19.8 m); the third, lateritic sand (223–3367 Ωm) with a thickness range of 11.1–56.9 m; and the fourth, dry sand with resistivity (1343–7270 Ωm) and thickness ranging from 46.8 to 101 m. The fifth layer represents the saturated sand aquifer (56–930 Ωmm), the depth to the top of which varies from 88 to 138 m. The significant depth required to penetrate the saturated aquifer makes access to the groundwater challenging, hence the ubiquity of failed boreholes in the area. This study furnishes information that enables access to elusive groundwater around the study area.