Abstract

Fifty (50) ditch cutting samples were collected from GN-well located in the Northern Depobelt, Niger Delta Basin at depth interval of 110ft to 860ft. Sedimentological investigation revealed the lithology, colour, grain shape, grain size, degree of sorting and mineralogy of the sediments. The samples are predominantly sands. Geochemical analysis was performed on eight (8) selected samples by employing the X-Ray Fluorescence (XRF) spectrometry. Major oxides observed were SiO2, Al2O3, Fe2O3, TiO2, CaO, P2O5, K2O, MnO, MgO, Na2O and trace elements recorded were Ba, Cu, Cr, Ni, Zn, Co, Th, Pb, Sc, La, V, U. Provenance, Paleo-redox condition, tectonic setting and sandstone class of the sediments were established. The trace elemental ratios of V/Cr and U/Th showed an oxic environment of deposition. Bivariate plot of Ni versus TiO2 and trace elemental ratios of Th/Sc, Th/Co, Cr/Th revealed that the sediments source was felsic in nature. The plot of K2O/Na2O versus SiO2 and Log (K2O/Na2O) versus Log (SiO2/Al2O3) fell majorly within the passive margin zone. Pettijohn and Herron classification schemes were applied to classify the sands. The aforementioned classification schemes pointed in the direction of Fe-sandstones and sublithic arenites.