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1 Acta Geophysica

1 2024

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Typification of coastal depositional lithofacies with isophysical and isochemical hydro-sand beds via stratigraphic modified Lorenz plots (SMLP): geohydrodynamical implications and valorization of hydrogeological units

George Nyakno Jimmy, Thomas Jewel Emem

Acta Geophysica

2024

Vol. 72, no. 2

1275--129

Using an integrated method, four distinct hydraulic flow units (HFUs) were produced from the hydrogeological layers of Ikot Abasi in southern Nigeria. The SMLP, which produced results comparable to those of the discrete rock typing (DRT) technique deploying flow zone indicator (FZI), was used to define and classify the geologic unit (GU) of the aquifer into sections denoted by isophysical and isochemical hydro-sand beds as well as sections with similar hydrodynamic characteristics. The results of an electrical resistivity investigation led to the discovery of three to four economically viable geo-electric strata for groundwater. The goal of this study is to economically valorize the HFUs within the GU for efficient groundwater management. Economic aquifer sand beds in layer two were identified and their resistivity ranged from 26.3-3576.5 Qm with an average of 764.3 Qm and thickness ranged from 2.9-262.6 m with a mean value of 61.7 m. Similarly, the estimated ranges of resistivity values and values of thickness of the economic aquifer sand beds in layer three were 58.0-3588.8 Qm (mean: 840.5 Qm) and 26.7-212.1 m (mean: 80.0 m), respectively. The result from DRT gave four HFUs, which conformed to the result of SMLP. The four HFUs christened as HFUrHFU4 are identified by tan0/slope with each corresponding to 2.083, 1.136, 0.483, and 3.101, respectively. The corresponding value for angle 0 in degrees was estimated at 64 (superconductor), 47 (conductor), 26 (semi-conductor) and 72 (superconductor), respectively. According to values of ranking efficiency, the delineated HFUs can be classified, respectively, as good, fair, poor and good. The aquifer system identified to be perfectly heterogeneous has good hydrodynamic prospect, which is paramount in groundwater flow management and contamination monitoring.