Source Parameter Imaging of Aeromagnetic Map of Sokoto Basin, Northwestern Nigeria
Publication Date: 04/02/2021
Author(s): Ezeh O. C., Egwuonwu G.N., Amadansun C.V.O., Umego M.N..
Volume/Issue: Volume 4 , Issue 1 (2021)
Abstract:
Recent aeromagnetic data of some parts of the Sokoto basin, an arm of the Iullemmeden Basin, north-western Nigeria was analyzed using source parameter imaging (SPI). The analyses were aimed at determining the depth to magnetic sources based on the total magnetic intensity (TMI) map of the basin and ascertain whether the basin has a good hydrocarbon potential. The area under study is situated between latitudes 10°30’’ N and 14° 00" N and longitudes between 3° 30” E and 7° 00" E covering area of 59,570 km2. Results of the analysis showed that the deepest and the shallowest magnetic sources are about 1.55 km and 0.12 km respectively. The deepest magnetic sources represent the magnetic basement whereas the shallow magnetic sources represent sedimentary layer. A significant variation is observed in the sedimentary thickness and this is shown to be dipping north-westwards giving the basement a rugged topography. The basement surface is also marked with a number of sediment-filled troughs and depressions and these were noted to have formed targets for groundwater. The interpreted SPI showed that the Sokoto Basin is shallow depth to basement sedimentary basin hence, exploration hydrocarbon which requires a minimum of about 3km sedimentary thickness in West African coastal area is not plausible.
Keywords:
Aeromagnetic, Source Parameter Imaging, Sedimentary, Basement, Hydrocarbon
