Vol. 2 No. 1 (2026): Geosciences Review - Vol 2, Issue 1

The subsurface thermal structure of Gombi North and environs in northeastern Nigeria was investigated using aeromagnetic data obtained from the Nigerian Geological Survey Agency. The study aimed to estimate Curie point depth, geothermal gradient, and heat flow, which are essential parameters for assessing geothermal energy potential. Data were processed using Oasis and MATLAB, and total magnetic intensity data were subjected to upward continuation to eliminate shallow anomalies. Spectral analysis was then applied to determine the depths of the top boundary and the centroid. Results showed that the depth to the centroid ranges from 9.15 km to 12.10 km, with an average of 10.49 km, while the Top Boundary depth ranges from 4.79 km to 5.56 km, with an average of 5.32 km. The Curie point depth ranged from 13.51 km to 18.64 km, with an average of 15.65 km. These values correspond to geothermal gradients of 31.12-42.93°C/km, with an average of 37.53°C/km, and heat flow values of 77.79-107.33 mW/m², averaging 93.88 mW/m². The findings suggest that blocks 2 and 3 exhibit favorable geothermal conditions, highlighting their potential for geothermal energy development in the region. This study provides valuable insights into the subsurface thermal regime and supports exploration of renewable energy resources in Northeastern Nigeria.