Geoelectrical investigation of geologically controlled hydro-geophysical parameters in Item area, of South Eastern Nigeria

[摘要] Predominantly argillaceous rock units of middle to upper cretaceous age underlie Item area of South Eastern Nigeria ranging locally from Nkporo Formation (Mid Creataceous) to Ajali (Upper Maastrichtian). While the older Central and Northern sections of the area are underlain by shales and limestones, the Southern area is younger and consists of quartz arenitic sands. Vertical Electrical Sounding data from nine locations indicate overriding shaly conditions from 3 m in all the Central and Northern areas while only one location in the south shows predominant sandy geoelectric section. Results from Vertical Electrical Soundings show that only the sandy location has resistivity of over 350 Ohm-m at depths of 100 to 150 m. It is thus concluded that only one location has positive potentials for underground water. Rather than embark on any drilling in the remaining eight locations, the perennial surface water sources could be exploited to give treated water to item community.

[学科分类] 物理（综合）

[关键词] Geoelectrical;creataceous;sediments;overiding shales.