Tag Archives: Aquitards

Geo-electric Drilling of Part of Abaji and Environs Abaji Area Council Federal Capital Territory Abuja North-Central Nigeria (Published)

Geoelectrical drilling was carried out in parts of Abaji Area Council, Federal Capital Territory of North-Central Nigeria, with the aim of establishing the groundwater potential of the area. Seventy-two (72) Vertical Electrical Sounding points established at various stations using Abem Terrameter SAS 300C/GPS12 Garmix with a maximum cable spread of AB/2=300m and MN/2=20m. The results obtained from the field data were interpreted using the IXID and IPI2WIN 2004 software for quantitative analysis, while the GIS software was used for the qualitative analysis. The study area shows four units of water system in some places at 30m, 60m, 90m and 120m. The apparent resistivities value ranges from as low as 56Оm to as high as 3000m. The study area revealed 5-7 lithologic sequences consisting of top soil, laterite, clay, siltstone, fine sand and sandstone of various thicknesses. The water bearing zones are within the fourth to sixth lithologic layers as a result of the moderate resistivity values obtained which ranges between 50m to about 650m. The clay units often reach thickness of 5 to 15m. This lithostratigraphy controls the occurrence, type and behavior of the aquifer units. The sand and clay intercalation constitute a system of aquifers separated by aquitards. The aquifer- aquitard units form multi-aquifer systems. The results correlate well with existing geology.

Keywords: Aquitards, Geoeletric Drilling. Lithostratigraphy, Lithology, Multi-Aquifer System