Interpretation Of Aeromagnetic Anomalies Over Some Parts Of Lower Benue Trough Using Spectral Analysis Technique

ABSTRACT Four aeromagnetic map sheets of 0 x 0 on a scale of 1 100000 covering some parts of Lower Benue Trough were analysed using spectral techniques to estimate the average depth of magnetic sources. The result indicates a two-layered source model. The deeper magnetic sources are located atdepths which vary between 1.16 km and 6.13 km with an average depth of 3.03 km representing magnetic basement surface. The depths to the shallower magnetic sources vary from 0.06 km and 0.37 km with an average depth of 0.22 km showing the presence of magnetic intrusive bodies within the sediments. Profiles taken from the area indicate that the topography of the basement is undulatingwith an anticlinal structure over Abakaliki area. The average depth to basement of 3.03 km to the magnetic source suggests enough sedimentary thickness for hydrocarbon accumulation. The undulatingof the basement surface possibly provides traps for hydrocarbon.Thus the possibility of hydrocarbon accumulation cannot be ruled out.