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首页> 外文期刊>Current Journal of Applied Science and Technology >Combined Use of Electromagnetic andMagnetic Survey for HydrogeophysicalCharacterization of Ijapo Housing Estate, Akure
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Combined Use of Electromagnetic andMagnetic Survey for HydrogeophysicalCharacterization of Ijapo Housing Estate, Akure

机译：电磁测量结合用于阿库雷Ijapo住宅区的水文地球物理特征

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Very Low Frequency Electromagnetic (VLF-EM) and ground magnetic studies were carried out in Ijapo Housing Estate, Akure, with the aim of delineating hydrogeologic associated structures. The area is underlain by the precambrian basement complex rocks of southwestern Nigeria. VLF-EM profiling was undertaken along 19 traverses with lengths ranging from 180 to 1,200m. Ground magnetic data were acquired along 35 traverses with lengths varying between 120 and 1,060 m. VLF-EM data were plotted as profiles and also inverted into 2D-sections using Karous-Hjelt filtering software. Ground magnetic data were reduced and inversed using automated euler-deconvolution software to estimate depths to basement. VLF-EM readings vary from – 110.3 to + 99.9% in the filtered real and imaginary components. VLF-EM depth-structure map enables the classification of the area into zones of shallow and deep fractures. Relative magnetic values vary from -1290.38 to +835.38 nT. Estimated depth to basement from the geomagnetic section was used to generate magnetic depth-structure map which enabled the classification of the study area into shallow and deep fracture zones. Correlations of results show that area classified as deep structure zone from VLF-EM coincide fairly well with that of ground magnetic. This is the high groundwater potential zone. Groundwater development programme within crystalline basement complex should be limited to high groundwater potential zone, because of the localized nature of its occurrence. Therefore, detailed geophysical survey should be carried out prior to drilling.
机译：为了确定水文地质相关结构，在阿库雷的Ijapo住宅区进行了超低频电磁（VLF-EM）和地磁研究。该地区位于尼日利亚西南部的前寒武纪基底复杂岩石之下。沿着19条导线进行了VLF-EM分析，长度为180至1,200m。沿35条导线采集了地磁数据，导线长度在120至1,060 m之间变化。将VLF-EM数据绘制为轮廓，并使用Karous-Hjelt过滤软件将其反转为2D截面。使用自动欧拉反褶积软件来估计和计算地下层的深度，从而减少并反演了地磁数据。滤波后的实部和虚部中，VLF-EM读数从– 110.3到+ 99.9％不等。 VLF-EM深度结构图可将区域分为浅裂缝和深裂缝区域。相对磁值在-1290.38至+835.38 nT之间变化。从地磁断层到基底的估计深度被用于生成磁深结构图，这使研究区域可以分为浅裂缝区域和深裂缝区域。结果的相关性表明，从VLF-EM分类为深层结构区域的区域与地磁区域非常吻合。这是地下水位高的区域。结晶基底复合体内的地下水开发计划应仅限于高地下水位区域，因为它的发生具有局部性。因此，应在钻探之前进行详细的地球物理勘测。

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