THE GEOCHEMICAL ASPECT OF EGBOHA WELL IN IMO FORMATION IN OKADA, OVIA NORTH EAST, SOUTHERN NIGERIA

Twenty-two samples were collected from Egboha well in Imo Formation, from which ten(10) samples were used to identify the different lithologies, Degree of effervescence were carried out to determine samples with carbonate minerals. Geochemical analyses were also carried out to get the geochemical data using ICP-MS and ICP-OES. Geochemical data for Imo Formation are presented and applied as proxies for deciphering paleo-environment (detrital influx, redox conditions, paleo-productivity) and providing insight to paleo-environmental conditions responsible for sedimentary geochemistry of Imo Formation. The detrital influx proxies used for this work [Si/Al having values ranging from (5.386-2.976) and Ti/Al having values ranging from (0.099-0.061)], show an increase in detrital influx (rate of deposition) and coarse grain at two depths, and at the other depths there is a decrease in detrital influx and fine grain. Paleo-redox proxies used for this work [Mo/Al having values ranging from (0.539-2.429), Ni/Al having values ranging from (7.181-16.194), U/Al having values ranging from (0.467-2.065)], show an enrichment of (U, Mo, Ni) and the oxygen level being suboxic - anoxic environment. Paleo-productivity proxies [Ba/Al having values ranging from (43.088-27.935)] shows an increase in the paleo- productivity at three depths which indicates high productivity of organisms during the Paleocene period, while at other depths, low productivity of organisms can be observed. Paleo-salinity [Sr/Ba having values ranging from (0.065-0.112)] shows an increase in paleo-salinity, which indicates high salt content at two depths and at other depths low paleo-salinity can be observed at
other depths. The result shows that elemental geochemistry can be applied to Study the paleo environment, paleoclimate, and depositional conditions