Two-dimensional spectral analysis of aeromagnetic data has been used to determine the mean depths to buried magnetic basement rocks in the Abakaliki Anticlinorium of the Lower Benue Trough in Nigeria. The average thickness of the sedimentary cover overlying the basement which may contain petroleum reservoirs has thus been determined. The results indicate a two depth source model with the depth to the deeper sources (identified with the crystalline basement) varying between 1200 and 2500 m. Isolated linear magnetic features which are prominent on the aeromagnetic maps were also studied in detail. The anomalies over such features (which in many cases have spatial dimensions that are greater than 10 km), were modelled in terms of dyke-like bodies using non-linear optimization techniques. The results obtained from these studies compare favourably with those from gravity and ground magnetic investigations carried out in the are.. The sediment thickness in the area, the occurrence of numerous intrusive bodies and the deformational history of the sedimentary rock sequences in the Abakaliki Anticlinorium suggest that this part of the Benue Trough may not hold much promise in terms of hydrocarbon accumulation.
Marine and Petroleum Geology 05/1991; 8(2-8):174-183. DOI:10.1016/0264-8172(91)90005-L