scholarly journals Evaluation of geothermal potential in some parts of Bida Basin of Nigeria using Curie point depths and heat flow from spectral analysis of aeromagnetic data.

2020 ◽  
Vol 4 (2) ◽  
pp. 79
Author(s):  
Matthew Tersoo Tsepav ◽  
Abu Mallam
Keyword(s):  
Heat Flow ◽  
Curie Point ◽  
Geothermal Gradient ◽  
Aeromagnetic Data ◽  
Energy Potential ◽  
Centroid Method ◽  
Crustal Block ◽  
Depth Analysis ◽  
Source Models ◽  
Grid Points

The Centroid method of Spectral Depth analysis was used to evaluate the Curie point depth (CPD), Geothermal Gradient and Heat Flow in some parts of the Bida Basin of Nigeria with a view to determining the energy potential of the area. The reduced-to-pole aeromagnetic data was divided into 16 overlapping ensembles and Fast Fourier Transformed to decompose the anomalies into their energy and wavenumber components using Oasis montaj software. The radial power spectrum was calculated for each of the grid points with the locations of the centres of the ensembles and a plot of Energy spectrum versus frequency was carried out to generate two different gradients: s<sub>1</sub> and s<sub>2</sub> representing different depth source models. These gradients were used to evaluate the average depth to the top of the deepest crustal block, Z<sub>t</sub>, depth to the centroid of the deepest crustal block, Z<sub>0</sub>, CPD, Geothermal Gradient and Heat flow. From the results obtained, the CPD varied from 2.59 to 8.23 Km while the thermal gradient and heat flow in the area revealed values ranging from 70.45 to 224.15 <sup>o</sup>CKm<sup>-1</sup> and 176.13 to 560.37mWm<sup>-2 </sup>respectively. The results of the contouring in conjunction with the CPD, geothermal gradient and the heat flow values have shown that the area has a greater energy potential in the south-eastern block of Katonkarfi, with shallow CPD and high geothermal gradient and heat flow. These results could be incorporated in the GIS and available geological, geophysical and geochemical information of the area to facilitate selection of the optimum site for energy exploration.

INVESTIGATION OF GEOTHERMAL ENERGY POTENTIAL OF PARTS OF CENTRAL AND NORTH-EASTERN NIGERIA USING SPECTRAL ANALYSIS TECHNIQUE

2020 ◽  
Vol 4 (2) ◽  
pp. 627-638
Author(s):  
Idena Odidi ◽  
A. Mallam ◽  
N. Nasir
Keyword(s):  
Spectral Analysis ◽  
Heat Flow ◽  
Curie Point ◽  
Hot Spring ◽  
Geothermal Gradient ◽  
Mean Value ◽  
Curie Point Depth ◽  
Aeromagnetic Data ◽  
Benue Trough ◽  
North Eastern

The current study deals with an estimate of the Curie point depth, heat flow and geothermal gradient from spectral analysis of aeromagnetic data covering an area located approximately between latitude 7.5o N to 11.5o N and longitude 7.5o E to 10.5o E, which corresponds to parts of the Benue trough (lower part of the Upper Benue trough, the entire middle Benue trough, and upper part of the Lower Benue trough), lower part of the Gongola and Yola Basins, the Precambrian Basement, the Jurassic Younger Granites and two prominent hot Springs, Wiki hot spring in Bauchi state (in the north-eastern part) and Akiri hot spring in Nasarawa state (in the south-western part) of central and north-eastern Nigeria. Radially power spectrum was applied to the aeromagnetic data of the study area divided into 48 square blocks and each block analysed using the spectral centroid method to obtain depth to the top, centroid and bottom of magnetic sources. The depth values were subsequently used to evaluate the Curie-point depth (CPD), geothermal gradient and near-surface heat flow in the study area. The values of the curie point depths (Zb), range from 7.6341 km to 34.5158 km, with a mean value of 14.7928km, geothermal gradient, range from 16.8039 0C km-1 to 75.97490C km-1, with mean value of 45.7021 0C km-1 and heat flow (q), range from 42.0097 mWm-2 to 189.9372mWm-2, with a mean value of 114.2554mWm-2. Which reveals that, there might probably be good sources for geothermal and thereby further recommended for detailed geothermal exploration.

Curie point depth, heat flow and geothermal gradient maps of Egypt deduced from aeromagnetic data

2018 ◽  
Vol 91 ◽  
pp. 620-629 ◽  
Author(s):  
S. Elbarbary ◽  
M. Abdel Zaher ◽  
H. Mesbah ◽  
A. El-Shahat ◽  
A. Embaby
Keyword(s):  
Heat Flow ◽  
Curie Point ◽  
Geothermal Gradient ◽  
Curie Point Depth ◽  
Aeromagnetic Data

scholarly journals Assessment of Geothermal Potentials In Some Parts of Upper Benue Trough Northeast Nigeria Using Aeromagnetic Data

2019 ◽  
Vol 4 (1) ◽  
pp. 7
Author(s):  
Abdulwahab Mohammed ◽  
Taiwo Adewumi ◽  
Salako Adeyinka Kazeem ◽  
Rafiu Abdulwaheed ◽  
Abbass Adebayo Adetona ◽  
...  
Keyword(s):  
Spectral Analysis ◽  
Heat Flow ◽  
Curie Point ◽  
Aeromagnetic Data ◽  
The South ◽  
Maximum Heat ◽  
Entire Study ◽  
Benue Trough ◽  
Depth Analysis ◽  
Western Portion

The assessment of geothermal potentials over part of the upper Benue trough corresponding to Kaltungo, Guyok, Lau and Dong areas, North Eastern Nigeria using spectral depth analysis of aeromagnetic data has been carried out. The study area is bounded by latitudes 9o00’N and 10o00’N and longitudes 11o00’E and 12o00’E. This research work is necessitated by the need for renewable and alternative sources of energy for use in Nigeria. Regional/residual separation was carried out on the total magnetic field using polynomial fitting method of order one. The residual map was divided into nine overlapping blocks for the spectral analysis. The centroid depths and depth to top of basement were obtained from the plot of log of power spectrum against wavenumber. These two parameters were used to estimate the Curie point depth using , where    and  are Curie depth, centroid depth and depth to top of basement respectively. The results from the spectral analysis suggested that in the parts of the Upper Benue trough, the basement is deepest at the south western portion towards the Lau area and varies between 0.55 and 3.8 km, while the centroid depth varies from 7.26 to 18.00 km. From the same portion of the trough, the Curie-point depths vary between 12.43 and 33.91 km and the corresponding geothermal gradient and heat flow values varying from 17.10 to 46.66 0C/km with an average of 30.75 0C/km and 42.75 to 116.65 mW/m2 with an average of 75.91 mW/m2 respectively. The maximum heat flow is found around the south western portion of the study area (Lau). The entire study area with high heat flow values might probably be good sources for geothermal and thereby recommended for both geothermal exploration and exploitation.

scholarly journals Determination of The Curie Point Depth, Thermal Gradient and Heat Flow of Parts of Central And North-Eastern Nigeria Using Spectral Analysis Technique

2020 ◽  
Author(s):  
George Idena Odidi ◽  
Abu Mallam ◽  
Naeem Nasir
Keyword(s):  
Heat Flow ◽  
Curie Point ◽  
Geothermal Gradient ◽  
Mean Value ◽  
Centroid Method ◽  
Geothermal Resources ◽  
Analysis Technique ◽  
North Eastern ◽  
Data Points

Abstract Radially power spectrum was applied to the aeromagnetic data covering an area 36,300km2 and bounded by latitudes 7.5o N and 11.5o N and longitudes 7.5o E and 10.5o E., divided into 35 square blocks (with 50% overlapping and approximately 64 by 64 data points) and each block analysed using the spectral centroid method to obtain depth to the top, centroid and bottom of magnetic sources. The result shows that the curie point depths, range from 17.711km to 34.34km, with a mean value of 26.21km, geothermal gradient, range from 16.89 0C km-1 to 32.75 0C km-1, with a mean value of 22.83 0C km-1 and heat flow, range from 42.22 mWm-2 to 81.87 mWm-2, with a mean value of 57.07 mWm-2. These results correlate with the existing geothermal and geo-tectonic signatures of the area. Hence, the possibility of the existence of geothermal resources in the study area and its possible exploration is not far fetch.

scholarly journals Estimation of Curie-point depths, geothermal gradients and near-surface heat flow from spectral analysis of aeromagnetic data in the Loum – Minta area (Centre-East Cameroon)

2018 ◽  
Vol 27 (4) ◽  
pp. 1291-1299
Author(s):  
Jean Aimé Mono ◽  
Théophile Ndougsa-Mbarga ◽  
Yara Tarek ◽  
Jean Daniel Ngoh ◽  
Olivier Ulrich Igor Owono Amougou
Keyword(s):  
Spectral Analysis ◽  
Heat Flow ◽  
Curie Point ◽  
Surface Heat ◽  
Aeromagnetic Data ◽  
Near Surface ◽  
Geothermal Gradients ◽  
Surface Heat Flow
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