Application of the resistivity method in characterizing fractured aquifer in sedimentary rocks in Abakaliki area, southern Benue Trough, Nigeria

Estimation of aquifer parameters from electrical resistivity data and lithologs in Idah area, Northern Anambra basin, Nigeria

“…The above information is suggestive that groundwater occurrence and permeability in the study area are dependent on the presence and interconnectivity of fractures. The highest k values (VES 21 and 22) were encountered in shale aquifers (Obasi et al, 2021). Contrary to the fact that clay mineral occurrence in the aquifer system is popular for lowering the aquifer's hydraulic conductivity (Salem, 1999;Ebong et al, 2014), the shaly aquifer understudy has higher k values than the sandstone aquifer.…”

“…Hence, the aquifer zone's resistivity is a function of the underlying geology. In areas that are underlain by shales and poorly consolidated sandstones, their resistivity values are much lower than their older and highly consolidated counterparts (Obasi et al, 2021). The very low aquifer resistivity values could imply the presence of some shally/weathered/regolith aquiferous zones with possible clay effects (Salem, 2001a;Obasi et al, 2021).…”

“…Based on simplicity and cost-effectiveness, a onedimensional (1-D) resistivity survey employing the VES configuration is assumed to be a much more suitable approach in many geological settings for groundwater investigation (El-Hussaini et al 1995;Ebong et al, 2014;Obasi et al, 2021). The method has also been found suitable to contribute substantially towards estimating aquifer parameters and can reduce the rate of pumping test and its cost implication as mentioned earlier.…”

Assessment of aquifer vulnerability in the tectonically deformed sedimentary rocks in Abakaliki area, southeastern Nigeria, using geophysical and geological data

“…Hence, the resistivity of the vadose zone (R VD ) was determined by calculating the mean resistivity of the layers above the aquifer zone, while the thickness of the vadose zone (h VD ) was determined directly by correlating the geoelectric section with the borehole lithologs generated during the drilling of the water wells (Fig. 2) (Obasi et al 2021).…”

“…Hence, the resistivity values of ≤ 50 Ωm that implies clay lithology(Lowrie 2007) only represent it at shallow depths of < 10 m below the surface. At depths ≥ 10 m, the same resistivity range represents the fractured/weathered baked shale/mudstone aquiferous zone(Obasi et al 2021…”