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首页> 外文期刊>Journal of Geoscience and Environment Protection >Delineation of Shallow Stratigraphy and Aquifer Formation at Kahe Basin, Tanzania: Implication for Potential Aquiferous Formation
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Delineation of Shallow Stratigraphy and Aquifer Formation at Kahe Basin, Tanzania: Implication for Potential Aquiferous Formation

机译：坦桑尼亚喀河盆地浅层地层和含水层形成的轮廓：对潜在含水层形成的启示

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Electrical resistivity method was conducted at Kahe-Mtakuja basin aimed at appraising the potential of the basin as a source of groundwater by establishing shallow stratigraphy and delineating aquifer formations. A total of fifty-eight vertical electrical sounding data (VES) were acquired using Schlumberger array and the data were analyzed to obtain apparent resistivity and layer depth. The interpretation of resistivity data revealed three main geoelectric layers. The first layer has resistivity values ranging from 40 to 230 style="color:#333333;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"=""> style="color:#333333;font-family:"font-size:14px;white-space:normal;background-color:#FFFFFF;">Ωm with thickness ranging from 0.4 to 2 m. The second layer has resistivity values in the range of 2 to 10 style="color:#333333;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"=""> style="color:#333333;font-family:"font-size:14px;white-space:normal;background-color:#FFFFFF;">Ωm and thickness of 2 to 25 m. The third layer has slightly high resistivity values ranging from 10 to 60 style="color:#333333;font-family:" font-size:14px;white-space:normal;background-color:#ffffff;"=""> style="color:#333333;font-family:"font-size:14px;white-space:normal;background-color:#FFFFFF;">Ωm and thickness in the range of 30 to 70 m. This layer is mainly dominated with sand. The resistivity cross-sections constructed from the interpretation of VES data indicate that the Kahe-Mtakuja basin has shallow stratigraphy consisting of 3 layers. The layers are composed mainly of top red soil, clay (sometime alternating with sand) and sand formation holding the groundwater. These findings are consistent with lithological logs of the borehole drilled near Kahe-Mtakuja that indicate two to five layers composed of alluvial deposits alternating with different lithological thicknesses. The high correlation between the VES results and borehole lithological logs near Kahe-Mtakuja suggests that the area is potential for aquiferous formation. Based on constructed stratigraphy, the aquifer formation of the basin is found in alluvial deposits composed of mainly sand. The potentiality of this area for aquiferous formation is vital for providing additional baseline data on the aquifer characteristics and will assist in reducing water scarce in the area.
机译：电阻率法是在Kahe-Mtakuja盆地进行的，旨在通过建立浅层地层并描绘含水层来评估该盆地作为地下水源的潜力。使用斯伦贝谢阵列获得了总共58个垂直电测深数据（VES），并对这些数据进行了分析以获得视电阻率和层深。电阻率数据的解释揭示了三个主要的地电层。第一层的电阻率值范围为40到230 style =“ color：＃333333; font-family：” font-size：14px; white-space：normal; background-color：#ffffff;“ =”“> style =“ color：＃333333; font-family：” font-size：14px; white-space：normal; background-color：#FFFFFF;“>Ω m，厚度范围为0.4至2 m第二层的电阻率值为2到10 style =“ color：＃333333; font-family：” font-size：14px; white-space：normal; background-color：#ffffff;“ =” “> style =” color：＃333333; font-family：“ font-size：14px; white-space：normal; background-color：#FFFFFF;”>Ω m和厚度2至25 m。第三层具有略高的电阻率值，范围从10到60 style =“ color：＃333333; font-family：” font-size：14px; white-space：normal; background-color：#ffffff;“ =” “> style =” color：＃333333; font-family：“ font-size：14px; white-space：normal; background-color：#FFFFFF;”>Ω m和厚度在30至70 m的范围内。该层主要是沙子。根据VES数据的解释构造的电阻率剖面表明，Kahe-Mtakuja盆地地层浅，由3层组成。这些层主要由表层红色土壤，粘土（有时与沙子交替）和保持地下水的沙子形成组成。这些发现与在Kahe-Mtakuja附近钻探的井眼的岩性测井结果一致，后者表明两到五层由冲积沉积物组成，并具有不同的岩性厚度。 VES结果与Kahe-Mtakuja附近的钻孔岩性测井曲线之间的高度相关性表明该地区具有形成含水层的潜力。根据构造地层，在主要由沙子组成的冲积沉积物中发现了盆地的含水层形成。该区域形成含水层的潜力对于提供有关含水层特征的其他基准数据至关重要，并将有助于减少该区域的缺水情况。

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