Geophysical exploration to estimate the surface conductivity of residual argillaceous bands in the groundwater repositories of coastal sediments of EOLGA, Nigeria

Abstract

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Estimating geohydrodynamic parameters and their implications on aquifer repositories: a case study of university of Nigeria, Nsukka, Enugu State

“…The distribution of FZI shown in Figure 16 revealed the same trend Corrected Proof as AQI. This is an indication that porosity and permeability varies directly with FZI in homogeneous and isotropic aquifer units (George et al 2017b). A graph of FZI against permeability (Figure 17) illustrates the relationship with a power equation given in Equation 15, having a correlation coefficient of 0.998.…”

“…This reflects the fact that there is a proportional increase between both parameters; as FZI increases, NPI also increases (Equation (18)). In a compact formation such as the study area, if the flow zone indicator decreases, the normalized porosity index will also decrease (Obrzud & Truty 2012;George et al 2017b). It can be inferred from the study that a positive change in flow zone indicator will lead to a negative change in normalized porosity index.…”

“…According to Amaefule et al (1993), Abed (2014) and George et al (2017b), AQI and FZI relate the petrophysical properties at small and large scale, and also help in estimating the dynamic properties by employing the pore geometry factor and tortuosity. These parameters (AQI and FZI) are generic tools used in assessing contamination and heterogeneity of aquifer units (George et al 2017b). AQI is an indicator that characterizes rock quality based on the relation of porosity and permeability of a medium and depends on the grain size and typologies of rocks.…”

“…AQI is an indicator that characterizes rock quality based on the relation of porosity and permeability of a medium and depends on the grain size and typologies of rocks. The FZI quantifies the flow character of the hydrogeologic unit and is related to the formation's void ratios/normalized porosity indices (Amaefule et al 1993;George et al 2017b). Estimation of permeability is important in groundwater circulation owing to the composite geometry of the connected pore spaces and the complex nature of the porous media (Carman 1937;Saar & Manga 1999).…”

Assessment of spatial distrilbution of porosity and aquifer geohydraulic parameters in parts of the Tertiary – Quaternary hydrogeoresource of south-eastern Nigeria

“…High clay content which impedes fluid movement is basically characterised by low resistivity values, low hydraulic conductivities and thus low longitudinal unit conductance. Consequently, sandy aquifers in the study area are characterised by low protective overburden covering materials, which make them vulnerable to contamination from microbiological, chemical, biochemical and other sources of groundwater contamination in the oil rich Niger Delta (George et al, 2017c). The UNEP (2011) opined that the area has widespread contamination of the water resources in the study area.…”