• 2020-03-10
• Adiat, K.A.N, Jacob, A.A, Adegoke, A.O, Ibekwe, C.C, Ilori, O.B.
• Volume 1, Issue 2

Abstract

Saline water flow direction study was conducted at some part of Lagos State, Southwestern Nigeria. This study was aimed at identifying lithological units, fluid contents, depth and thickness of the saline water and freshwater aquifer and consequently delineates the saline water flow direction(s). Logs obtained from Thirteen (13) boreholes from different locations across six Local Governments Areas of Lagos state were used. The logs consisted of natural gamma ray and electrical resistivity logs from borehole total depth ranging from 120 m to 280 m. The response from the Gamma ray logs ranges from 5-115 cps, and the short and long normal resistivity logs response ranges from 2 - 1400 m across the study area. Well correlations were established in four different directions: the West-East, Southeast-Northwest and Southwest-Northeast (a and b). The generated maps of the saline water thickness, and depth to saline water zone revealed that saline water is flowing from the southern part to the northern, northwestern and northeastern parts of the study area. Also the map of depth to saline zone shows that the wells closer to the Atlantic Ocean were first affected and have a very low depth to saline zone than wells farther away from the ocean. Based on these, the saline water source within the study area is believed to be the Atlantic Ocean, and the saline water flows from the Atlantic Ocean to the northern, northwestern, and northeastern directions of the study area.