文山小河尾水库岩溶含水渗漏通道的地球物理新证据  

New geophysical evidence for karst water-bearing seepage pathways in the Xiaohewei reservoir,Wenshan City

作　　者：周建兵 罗锐恒 贺昌坤 潘晓东[2,3,4] 张绍敏 彭聪 ZHOU Jian-Bing;LUO Rui-Heng;HE Chang-Kun;PAN Xiao-Dong;ZHANG Shao-Min;PENG Cong(Institute of Wenshan Hydraulic and Electric Power Survey,Wenshan 663000,China;Institute of Karst Geolog of Chinese Academy of Geological Survey,Guilin 541004,China;Karst Dynamics Laboratory of Ministry of Natural Resources,Guilin 541004,China;International Research Center on Karst under the Auspieces of UNESCO,Guilin 541004,China)

机构地区：[1]文山壮族苗族自治州水利电力勘察设计院,云南文山663000 [2]中国地质科学院岩溶地质研究所,广西桂林541004 [3]自然资源部岩溶动力学重点实验室,广西桂林541004 [4]联合国教科文组织国际岩溶研究中心,广西桂林541004

出　　处：《物探与化探》2023年第3期707-717,共11页Geophysical and Geochemical Exploration

基　　金：国家自然科学基金项目(41702278);中国地质调查局地质调查项目(DD20190326);社会服务项目“云南省小河尾水库岩溶渗漏水文地质勘察”(YRSF-2020-505)。

摘　　要：小河尾水库作为文山市境内海拔最高的岩溶水库,自建成蓄水以来,存在严重的库水渗漏问题,虽经多次防渗处理,但水库渗漏的情况仍未改善。为确定小河尾水库地下岩溶渗漏通道的位置,以指导后期水库防渗工程的部署,本次研究在工程区内利用高密度电法与音频大地电磁法探测水库地下渗漏通道,通过对物探测试数据进行2D反演试算,发现将这2种方法相结合具有可行性,2种方法物探异常点位置高度吻合,能精确反映地下不同深度的地质情况,探测结果能为后期设计和施工提供参考依据。基于实测数据反演结果,并结合地表地质资料、钻探验证手段,推测水库主要存在2条NNE向且高程集中于1 800 m以上的岩溶含水渗漏通道,其中I号岩溶渗漏通道位于灰岩与硅质岩接触带附近,II号岩溶渗漏通道位于灰岩内部岩溶裂隙处。同时基于本次物理勘探结果,笔者也为小河尾水库后期防渗处理提出了帷幕灌浆工程部署建议。As a karst reservoir with the highest altitude in Wenshan City,the Xiaohewei reservoir has been suffering from severe water seepage since its completion.Despite several seepage control treatments,the seepage of the reservoir is still not effectively controlled.To determine the locations of underground karst seepage pathways of the reservoir and guide the later seepage control project,this study detected the seepage pathways in the project area combining the high-density resistivity method and the audio magnetotelluric method.The 2D inversion trial calculation of geophysical testing data indicates the feasibility of combining the two methods.The methods show highly consistent geophysical anomaly positions and can accurately reflect the geological conditions at different burial depths.Thus,their detection results can be referenced for later design and construction.Based on the inversion of measured data,the surface geological data,and the drilling verification means,it is speculated that the reservoir mainly has two NNE-directed karst water-bearing seepage pathways with an elevation of more than 1800 m.These two karst seepage pathways(No.1 and No.2)are located near the contact zone between limestones and siliceous rocks,and in the karst fissures inside limestones,respectively.Based on the geophysical exploration results,this study also puts forward some suggestions on the deployment of the curtain grouting project for later seepage control of the Xiaohewei reservoir.

关 键 词：物理勘探 岩溶水库 渗漏通道 音频大地电磁法 高密度电法 

分 类 号：P631.4[天文地球—地质矿产勘探]