Geosciences Journal最新文献

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Source investigation of Ikanje artesian spring in north-central Nigeria, using VLF-EM and VES geophysical techniques 利用 VLF-EM 和 VES 地球物理技术对尼日利亚中北部 Ikanje 自流泉进行泉源调查

IF 1.2 4区地球科学 Q2 Earth and Planetary Sciences

Geosciences Journal

Pub Date : 2024-01-04 DOI: 10.1007/s12303-023-0035-4

Abstract

The study is aimed to examine the subsurface fracture system surrounding the Ikanje Artesian spring as regards the water-bearing zones to determine the source of the spring. The area is in a part of the basement complex of southwestern Nigeria. Using the ABEM WADI Very Low Frequency-Electromagnetic (VLF-EM) equipment, 40 profiles were established, 10 on each geographical coordinate at a 5 m inter-station gap, giving a total of 800 station positions. Four resistivity VES points were deployed for correlation purposes. Excel, Fraser Filter, and Karous-Hjelt Filter software were employed for the analysis. The Fraser Filter and Karous-Hjelt plots revealed underlying water-bearing fractures in all directions with prominence toward the south. The trend of the water-bearing fractures that links all the southern profiles indicates that the spring’s source is in the southern area. Inferred 3D conductive maps equally confirmed the highest conductivity in the southern region of the area, indicating wet fractures. The 1D pseudo sections from VES points indicated that the main aquifer linked to Ikanje artesian spring is hosted by a 64.5 m thick fractured basement, overlain by a weathered basement in the SW flank; thus the location could be most suitable for groundwater exploitation.

摘要该研究旨在考察 Ikanje 自流水泉周围地下含水带的断裂系统，以确定泉水的来源。该地区位于尼日利亚西南部基底复合体的一部分。利用 ABEM WADI 甚低频电磁（VLF-EM）设备绘制了 40 条剖面图，每个地理坐标 10 条，站间间隔 5 米，共 800 个站位。部署了四个电阻率 VES 点，用于相关目的。采用 Excel、Fraser 滤波和 Karous-Hjelt 滤波软件进行分析。Fraser 滤波图和 Karous-Hjelt 滤波图显示了各个方向的地下含水断裂，其中南侧的含水断裂最为突出。连接所有南部剖面的含水断裂趋势表明，泉源位于南部地区。推断的三维电导图同样证实了该地区南部的电导率最高，表明该地区为湿断裂。从 VES 点得到的一维伪断面图表明，与 Ikanje 自流泉相连的主要含水层由 64.5 米厚的断裂基底承载，西南侧被风化基底覆盖；因此，该地点最适合开采地下水。

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