Evaluation of the depth to the bottom of magnetic sources and heat flow from high resolution aeromagnetic (HRAM) data of part of Nigeria sector of Chad Basin

Geothermal Energy Potential of the Chad Basin, North-Eastern Nigeria

“…Hence, hydrocarbon exploration is feasible in all parts of the study area except the westcentral part, where a depth is lesser than 2.3 km.For the Curie-point isotherm map (Fig.8), the values trend NE-SW with the shallowest (15 km) at the northeastern part of the study area, while the deepest (> 30 km) is noticeable at the southeastern part of the study area, this deeper part of the study area extends into the Republic of Chad and Upper Benue trough where similar results have been obtained (Lawal and Nwankwo, 2017;Nur et al, 1999). Lawal and Nwankwo (2017) obtained a depth to base of magnetic sources value ranging between 18.18 and 43.64 km, with an average of 28.70 km. It can also be observed from the map that shallow depth to the base of magnetic sources are associated with negative magnetization which corresponds to low magnetic values of the residual map (Salk et al, 2005).…”

“…In addition the average value for heat flow obtained (58.47mWm ) is consistent with that of Anakwuba et al, (2015) who obtained a value of 54.375 / for an adjoining area. Lawal and Nwankwo (2017) obtained an average of 54.93 / . It is believed that the estimated geothermal gradient and heat flow values in this study differs from the estimated values from previous works using Borehole data from oil wells in Chad (Bornu)basin (Nwankwo et al, 2009a;2009b)due to lack of any of such boreholes being located in our study area.…”

“…It encompasses the southeastern portion of the basin which is situated in a tectonically energetic area with features which spreads northwest to the Air Plateau and Southwest towards the Benue trough, the third and unsuccessful arm of a three-layered rift joint developed as a result of the separation of African and South American plates in early Cretaceous times (Carter et al, 1963). Geologically, the basin, which houses the study area has been described by many authors (Nur 2001;Obaje 2009;Odebode 2010;Lawal and Nwankwo, 2017). This basin is believed to be a broad sediment-filled depression stranding Northeastern Nigeria and adjourning parts of Chad Republic.…”

“…There has never been a more urgent time to look into generation of electric power generation from other sources to complement the ones being used despite the fact that geothermal source of energy has been successively annexed in some countries in Africa and world at large, Nigeria as a country cannot be exempted from the possibility of exploring geothermal energy (Ewa and Kryrowska 2010).Geothermal energy refers to the use of heat energy within the earth where earth's heat engine is driven by cooling of the crust and heating of the lower crust and mantle by thermal decay of radioactive isotopes, therefore the deeper below the surface, the hotter the temperature is (W.E.C, 2016). Some studies have been carried out on geothermal potential in different basins and geological area in Nigeria (Ewa and Kryrowska, 2010;Lawal and Nwankwo, 2017;Nwankwo and Shehu, 2015;and Nwankwo, L.I., 2015). Ewa and Kryrowska (2010) and Nwankwo et al,(2009) reported that geothermal gradient values ranging from 34 ˚C/km to 59 ˚C/km were obtained during a temperature data analysis from wire line logs of 14 shallow water wells which are about 500 m deep in areas covering part of Chad basin.…”

Characterizing the Source of the Eastern Galicia Magnetic Anomaly (NW Spain): The Role of Extension in the Origin of Magnetization at the Central Iberian Arc

“…Aeromagnetic data are a valuable source of geological information. Regional datasets have been commonly used to (1) establish the depth to the Curie Point and hence the thermal structure of large areas (Andres et al., 2018; Lawal & Nwankwo, 2017; Salem et al., 2014), (2) to unravel the basement structure and depth (Ali et al., 2017; Baptiste et al., 2016; Bascou et al., 2013), (3) to map mineral deposits (Dufréchou et al., 2015) and fractures (Grauch et al., 2001), (iv) to establish relationships with certain types of mineralizations (Sant'Ovaia et al., 2013, pp. 33–39), (v) to contribute to the knowledge of crustal structure and evolution (Calvín et al., 2014; Pedreira et al., 2007), etc.…”