Abstract
In this research paper, the sub-surface heat flow of a part of the Chad Basin, in North eastern Nigerian was estimated using spectral analysis. This was obtained from twenty (20) digitized High Resolution Aeromagnetic (HRAM) data sheet covering the study area. Regional-residual separation using first order polynomial fitting method with three coefficients was carried out on the data map before the application of statistical spectral analysis. Result shows that the centroid depth varies between 9.39 km and 18.31 km. The depth to the Curie temperature isotherm varies between 15.14 km and 33.46 km below the mean sea level. It was also found that the Curie temperature isotherm within the basin is not a horizontal level surface but an undulating surface with geothermal gradients and heat flow ranging between 15.77 and 38.31°C/Km, and 39.41 and 95.77 mWm -2 respectively. Thus, the calculated average geothermal gradient and heat flow for this area are 23.39°C/Km and 58.47 mWm -2 respectively. Since average heat flow in thermally normal continental region is 60 and the values in excess of 80 mWm -2 – 100 mWm -2 are associated with anomalous geothermal conditions, hence the study area can generally be considered as a thermally normal region. But, the northeastern part of the study area with values in excess of 80 mWm -2 is recommended for further investigation Keywords: Geothermal energy, Spectral Analysis, Chad Basin. Curie point depth
Highlights
15.14 km and 33.46 km below the mean sea level
The northeastern part of the study area with values in excess of 80 is recommended for further investigation
The variation in the depth to the top of magnetic sources obtained from the study area shows a spatial relationship between the sediments overlying the Precambrian basement complex which is characterized by elevations and depressions
Summary
It was found that the Curie temperature isotherm within the basin is not a horizontal level surface but an undulating surface with geothermal gradients and heat flow ranging between 15.77 and 38.31 ̊C/Km, and 39.41 and 95.77 respectively. The calculated average geothermal gradient and heat flow for this area are 23.39 ̊C/Km and 58.47 respectively. Since average heat flow in thermally normal continental region is 60 and the values in excess of 80. – 100 are associated with anomalous geothermal conditions, the study area can generally be considered as a thermally normal region. The northeastern part of the study area with values in excess of 80 is recommended for further investigation. Geothermal energy potential was carried out in other to complement the existing work done in the area
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