Interpretation of Airborne Magnetic and Geo-electric Data: Resource Potential and Basement Morphology of the Ikom–Mamfe Embayment and Environs, Southeastern Nigeria

摘要: The Ikom–Mamfe Embayment, which cuts across southeastern Nigeria and southwestern Cameroon, is a bifurcation of the Benue Trough NW–SE splay component NE–SW trending trough. Nigerian sector embayment, sedimentary province bounded to north south by basement terrains, considered relatively frontier basin with little information about its resource potential. Here, airborne magnetic, resistivity self-potential (SP) data were integrated in studying embayment surrounding localities. This study aimed delineate (possible) mineral-bearing lineament structures their corresponding trend orientations, evaluate relationship tectonic fabric, estimate depth perturbing causative sources, map ore bodies, identify probable locations for detailed petroleum system analysis. For first time, 2D electrical SP methods deployed sub-surface characterization embayment. Results aero-magnetic analysis revealed presence high magnetic intensities predominantly western northeastern parts area. observed at part are due mineral bodies present within host. In addition ores, noticeable signatures associated outcropping units complex rocks that comprise mainly migmatitic metasediments. large variation attributed combined effect igneous intrusives lineaments emplaced overlying sediments. Analysis structural depicts E–W ENE–WSW as dominant orientations minor NW–SE, NNE–SSW trends. aligned parallel Cameroon Volcanic Ranges, genetically related. These occur form faults, fractures veins, they densely distributed some areas moderate analytical amplitudes. suggests possible between metalliferous deposits. marked ground geophysical surveys. traces derived from these reveal numerous underlying contrasting potential host formation. shallow sources exposed second vertical derivative images. show remarkable agreement geo-electric data. results quantitative assessment and, hence, thin layer (0.2–2.4 km) around insufficient concealment hydrocarbon resource. addition, intrusive implies temperature environment favorable “cooking” source beyond generating window. renders area disadvantageous exploration. However, we discover thickness (ranging 3 4 km) mapped could favor formation accumulation fluids. area, characterized intrusion, lies approximately northeast prolific Niger Delta oil shows fair good conditions required entrapment. morphology, disposition call this