Abstract

The present study interpreted high-resolution aeromagnetic data using spectral analysis interpretation technique to carry out a regional estimation of geothermal resources of the entire Benue trough, Nigeria. The data was partitioned into 46 overlapping blocks and the depths to top, bottom and center of the magnetic sources for each overlapping data were computed. The calculated depths were then used to determine curie-point depths, geothermal gradients, and heat flow in the basin subsurface. The geothermal gradient in the study area indicated a range of values from 12.5 to 38.3 °C/km with a mean value of 26.0 °C/km, while the curie-point depths vary from 15.0 to 45.3 km with a mean depth of 23.2 km. The study identified four separate geothermal zones namely A, B, D, and F. However, zone F before this study has been unknown. It, therefore, represents an additional geothermal zone to the previous works in the study area. The values of heat flow vary from 31.2 to 95.8 mW m⁻² with a mean value of 65.1 mW m⁻². This study provides new insights into the geothermal resources of the Benue trough. The high heat flow values in the entire region might be considered good for geothermal exploration and therefore, the geothermal zones identified should be considered for further investigations.

Article Highlights

The study identified four separate geothermal zones: A, B, D, and F. The geothermal zone F before this study has been unknown. It provides new insights into the geothermal resources of the Benue trough.

中文翻译：

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利用高分辨率航磁数据对尼日利亚整个贝努埃海槽地热资源进行区域估算

摘要

本研究利用光谱分析解释技术对高分辨率航磁数据进行解释，对尼日利亚整个贝努埃海槽的地热资源进行区域估计。数据被划分为 46 个重叠块，并计算每个重叠数据的磁源顶部、底部和中心的深度。然后使用计算的深度来确定居里点深度、地温梯度和盆地地下的热流。研究区地温梯度范围为12.5～38.3℃/km，平均值为26.0℃/km，居里点深度为15.0～45.3km，平均深度为23.2km . 该研究确定了四个独立的地热区，即 A、B、D 和 F。然而，在这项研究之前，F 区是未知的。因此，它 代表了研究区先前工作的额外地热区。热流值从 31.2 到 95.8 mW m^-2，平均值为65.1 mW m ^-2。这项研究为贝努埃海槽的地热资源提供了新的见解。整个地区的高热流值可能被认为有利于地热勘探，因此，应考虑对确定的地热区进行进一步调查。

文章亮点

该研究确定了四个独立的地热区：A、B、D 和 F。本研究之前的地热区 F 未知。它提供了对贝努埃海槽地热资源的新见解。