Application of Transient Electromagnetic Method in Investigation of Underground Water in Xiong'an New Area
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摘要: 为了查明雄安新区地下含水体的空间分布特征，在雄安新区开展了面积性瞬变电磁测量工作，结果表明：利用瞬变电磁法能快速圈定冲洪积扇体和古河道的平面展布形态，有利于快速圈定近地表水源地和有利富水区；通过三维地电模型分析，冲洪积扇体和明化镇组含水体具有高电阻率特征，冲洪积扇体厚度小于100 m，且自西向东逐渐尖灭，冲洪积扇缘自高阳北‒安新‒雄县‒霸州北方向不规则展布，冲洪积扇是雄安新区主要地下含水体，400 m以下明化镇组含水层呈水平层状分布，其富水性弱于表层冲洪积扇体.从三维空间分析了不同含水体的空间分布特征，为雄安新区地下水资源合理利用和保护提供可靠的地球物理依据.Abstract: In order to find out the spatial distribution characteristics of the underground aquifer in Xiong'an New Area, it carried out the areal transient electromagnetic survey in Xiong'an New Area.The results show that TEM can be used to quickly delineate the planar distribution of alluvial-diluvial fans and ancient channels, which has advantages of quick delineation of near surface water sources and favorable water-rich areas.According to 3D geoelectric model analysis, alluvial-diluvial fan and Minghuazhen Formation aquifers are characterized by high resistivity, the thickness of alluvial-diluvial fan is less than 100 m and gradually disappears from west to east, the alluvial-diluvial fan is irregularly distributed from north Gaoyang-An'xin-Xiongxian and North Bazhou, alluvial-diluvial fan is the main aquifer in Xiong'an New Area, the Minghuazhen Formation aquifer is horizontally layered below 400 m, and its water content is weaker than the surface alluvial diluvial fan. In this paper, it analyzes the spatial distribution characteristics of different water bodies from 3D space, providing a reliable geophysical basis for rational utilization and protection of groundwater resources in the Xiong'an New Area.
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图 1 雄安新区水系及TEM幅值
Fig. 1. Surface water system and TEM amplitude diagram of Xiong'an New Area
图 2 不同采样延时平面幅值图
Fig. 2. Plane amplitudes of different sampling delays
a. 0.094 ms; b. 0.278 ms; c. 0.754 ms; d. 1.98 ms
图 4 保定‒沧州平原区地貌类型（自王宇, 2012修改）
Fig. 4. Topographic type map of Baoding-Cangzhou plain area (modified after Wang, 2012)
图 5 层状模型正反演计算
a.正演模型；b.正反演电阻率折线图
Fig. 5. Forward and inverse calculation of layered model
图 9 电阻率三维剪裁图(Res＞85 Ω·m)
Fig. 9. 3D resistivity clipping diagram Xiong'an New Area (Res > 85 Ω·m)
表 1 岩性电阻率对照
Table 1. Resistivity for different lithology
岩性 电阻率（Ω·m） 粘土 3~15 亚粘土 4~19 亚砂土 5~21 粉砂 20~70 中细砂 19~90 粗砂 42~105 卵砾石 65~230 
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表 2 地面瞬变电磁法采样时窗
Table 2. Surface TEM sampling window
采样道 时间（ms） 采样道 时间（ms） 采样道 时间（ms） CH1 0.032 CH12 0.418 CH23 3.508 CH2 0.044 CH13 0.510 CH24 4.242 CH3 0.058 CH14 0.620 CH25 5.128 CH4 0.074 CH15 0.754 CH26 6.200 CH5 0.094 CH16 0.916 CH27 7.494 CH6 0.118 CH17 1.112 CH28 9.058 CH7 0.148 CH18 1.348 CH29 10.948 CH8 0.184 CH19 1.634 CH30 13.180 CH9 0.226 CH20 1.980 CH31 15.940 CH10 0.278 CH21 2.396 CH11 0.342 CH22 2.900
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