Abstract
This paper evaluates the aeromagnetic data over parts of the Lower Benue Trough and Anambra Basin of North central and Southeastern Nigeria obtained from the Nigerian geological Survey Agency, Abuja to quantitatively determine the Curie Point Depth, Geothermal gradient, and Heat flow using Oasis montaj software, Fourpot software, and Surfer software. The results revealed that the average Curie point Depth of the Study area is 8.07594 km, the Geothermal gradient obtained has an average value of 73 oC/km, areas with low and intermediate geothermal gradient are, Southeast of Obubra, Northeast of Obi, North West of Odolu, and Awgu. The study area has an average heat flow of 170 mW/m2 , it is observed from the map that the areas around Igunmale, Abakaliki, Udi, Ejekwe and some area around Nkanu East have high heat flow rate attributed to presence of intrusive rock. Consequently, the study area is characterized by low, intermediate and high magnetic anomalies, the most prominent trend observed is in the ENE -WSW and NE – SW minor trend direction and has high heat reservoir potential which can be harnessed as geothermal energy, there is also a possibility of high temperature and pressure hydrocarbon reservoir potential.
Highlights
The role energy plays can never be exaggerated, and there is barely any activity that is free of energy
The Total magnetic intensity map comprising of merged sheets is displayed in figure 4, the map shows raw magnetic intensity values of the distinctive rock within the area, magnetic intensity values ranging from low -51.6 nT to high 114.4 nT, a great part of the study area are characterised by high magnetic intensity which its peak are indicated by pink or orchid color
The reduced Total magnetic intensity (TMI) map yielded the Reduction to magnetic equator map depicted as figure 5, the magnetic intensity value ranges from -41.9 nT to 102.1 nT, the Reduction to Equator (RTE) magnetic anomaly map shows both low, intermediate and high frequency anomalies which represents the low, intermediate and high magnetic signature within the area, the areas with high observed magnetic intensity are the areas with low magnetic susceptibilities, and the areas with the low magnetic intensity are those with the high magnetic susceptibility which can be confirmed when magnetic or gravity data is modelled to generate magnetic Susceptibility
Summary
The role energy plays can never be exaggerated, and there is barely any activity that is free of energy. The gravity method measures the spatial variations in the strength of the gravitational field of the earth, and is applicable in fossil fuel and bulk mineral deposit exploration, underground water exploration, engineering and construction sites investigation. Both methods are integrated and used as reconnaissance tools in oil and gas exploration (Patterson and Reeves, 1985). The objective of this paper is to evaluate the total magnetic intensity map for estimation of the Curie point depth, heat flow, and geothermal gradient within the study area. The six (6) Tmi sheets were obtained in Geosoft file format and were merged to produce the Total magnetic intensity of the whole study area depicted in figure 2
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