Imaging magmatic intrusions using derivatives of high-resolution aeromagnetic data over the Nigerian sector of the chad Basin

Abstract

Magmatic activities can either positively or negatively affect hydrocarbon generation in sedimentary basins. The effect of these activities can be positive when they prevent further migration and escape or negative when extreme pressure and high temperature force the hydrocarbon to evaporate at the time of emplacement. The aim of the study is to confirm the presence of intrusive structures in the Nigerian sector of the Chad Basin using derivatives of aeromagnetic data. The enhanced body and edges suggest a dyke-like structure intruding the Chad Basin. The edges are identified as areas that are skewed on the first vertical derivative and maxima over the analytic signal generated by the dyke-like intrusion. Three profiles with lengths ranging from 68.4 km to 263.9 km were generated on the derivatives of aeromagnetic data, and the analytical results indicate dyke-like structures of 0.3 km to 0.4 km in size.

Keywords

• Imaging
• Intrusions
• Aeromagnetic
• Chad Basin
• Derivative
• Analytic signal