Assessment of geothermal potential of parts of Sokoto Basin, Northwest Nigeria using aero-radiometric data

Abstract

This investigation deals with the assessment of aero-radiometric data of parts of the Sokoto Basin, Northwest Nigeria for the prospect of geothermal energy. The study area lies within the longitude of 4° 30′–6° 00′ East and the latitudes 11° 00′–13° 30′ North covering an estimated total area of 45,375 km2. Fifteen aero-radiometric data sheets used for this investigation were processed, analyzed and interpreted qualitatively and quantitatively. The data were qualitatively interpreted using the blending method in Grid and Image Geosoft extension of Oasis Montaj software. Hence, the concentrations of Potassium, Thorium, and Uranium maps were produced. Quantitively, the rock type in each area was identified while processing the average element in each rock to estimate radiogenic heat production values. The concentrations of Potassium, Thorium and Uranium revealed results of 0.12–2.34%, 4.0–21.6 ppm and 0.6–5.6 ppm, respectively. The radiogenic heat production values vary between 0.95 and 3.63 μW/m3, with an average of 1.93 μW/m3. Consequently, the overall assessments show that the study area possesses moderately high contents of Potassium, Thorium and Uranium. The results of radiogenic heat production also indicated a favourable prospect for geothermal energy around Argungu, Wasagu and Zuru areas. Therefore, exploring these areas for the purpose of geothermal energy would augment power generation in Nigeria.