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The effect of the application of optimal combination of direct electric sounding method to water exploration in pediment gobi area of the Hexi Corridor |
Zhen-Jie ZHANG1, Xiao HU2, Hui XIE1 |
1. Institute of Hydrogeology and Engineering Geology Prospecting,Gansu Bureau of Geology and Mineral Exploration and Development, Zhangye 734000, China 2. Gansu Provincial Geological Survey Institute,Lanzhou 730000, China |
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Abstract The distribution of groundwater under different hydrogeological conditions has different geophysical responses to various geophysical prospecting methods. Based on the experimental study of geophysical methods, the authors searched for the Quaternary groundwater in the non-uniform water area of the piedmont gobi, used such combinational means as sounding test beside the well, electric resistivity sounding sweeping, sounding of induced polarization detailed investigation and hydrology electric logging, thus achieving a new breakthrough in the search for water. The change of the (ρs) parameter of electric resistivity sounding and the (ηs, St, Z) parameters of the sounding of induced polarization are closely related to the lithologic structure of the strata and the degree of mineralization of the groundwater and the distribution of geological structures. The parameters of the sounding of induced polarization are more closely related to groundwater richness.
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Received: 05 December 2017
Published: 19 December 2018
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地层 | 岩性 | ρs/(Ω·m) | ηs/% | | 表层亚砂土、亚黏土 | 20~190 | 0.3~0.5 | | 含泥砂砾卵石(干燥) | 300~800 | 0.5~0.7 | Q | 含泥砂砾卵石(含水) | 120~360 | 1.4~1.8 | | 泥质砂砾石(干燥) | 200~400 | 0.4~0.6 | | 泥质砂砾石、砂(含水) | 80~220 | 1.2~1.6 | N | 泥岩 | 10~25 | 0.3~0.5 | | 砂岩 | 20~45 | 0.4~0.6 |
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孔号 | 孔深/m | 孔径/m | 水位埋深/m | 含水层 厚度/m | 降深/m | 涌水量/(m3/d) | k1 | 297 | 0.5 | 60.15 | 83.75 | 23.60 | 1752 | k2 | 280 | 0.5 | 71.47 | 105.54 | 4.13 | 1920 | k3 | 280 | 0.5 | 64.05 | 102.00 | 3.11 | 1971 | k4 | 280 | 0.5 | 57.00 | 136.25 | 1.13 | 1984 |
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