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Application of the resistivity method in characterizing fractured aquifer in sedimentary rocks in Abakaliki area, southern Benue Trough, Nigeria
Environmental Earth Sciences ( IF 2.8 ) Pub Date : 2021-01-06 , DOI: 10.1007/s12665-020-09303-w
Ikenna A. Obasi , Nneka M. Onwa , Ezekiel O. Igwe

Resistivity range for groundwater-bearing fracture zones was studied in the fractured shales and sandstones of pre-Santonian sedimentary succession in Abakaliki area, southern Benue Trough, Nigeria using vertical electrical sounding (VES) data and borehole lithologs. The results of the study indicate that resistivity of water-bearing fracture zones in the shales is ≤ 52 Ωm and about 107 Ωm in sandstones. These fractures occur at a depth of ≥ 18 m in shales but shallower (≥ 6 m) in sandstones. The wider the fracture, the more the resistivity tends to zero, and the higher the volume of water present in it. While the layer models define the water-bearing layer, the synthetic model defines depth to the top of the fracture and fracture thickness. The wideness of the fractures decreases gradually below 80 m depth. The spatial distribution of resistivity in the area indicates that resistivity increases with depth except for the fracture zones.



中文翻译:

电阻率法在表征尼日利亚贝瑙海槽南部阿巴卡利基地区沉积岩裂缝性含水层中的应用

利用垂直电测深(VES)数据和钻孔岩性测井资料,研究了尼日利亚贝努特海槽南部Abakaliki地区桑托期前沉积演替的裂缝性页岩和砂岩中的含地下水裂缝带的电阻率范围。研究结果表明,页岩中含水裂缝带的电阻率≤52Ωm,砂岩中约为107Ωm。这些裂缝在页岩中的深度≥18 m,但在砂岩中的深度浅(≥6 m)。裂缝越宽,电阻率趋于零的趋势越大,裂缝中存在的水量越大。虽然层模型定义了含水层,但综合模型定义了裂缝顶部的深度和裂缝厚度。裂缝的宽度在深度小于80 m时逐渐减小。

更新日期:2021-01-06
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