摘要
通过实践应用、理论推导和模拟计算,说明天然电场选频法在浅层地下水勘探中的有效性,并分析其异常形成过程中起主要作用的天然一次场场源分量。将选频法应用于广西农村找水打井项目中,依据其勘探成果共钻井131口,出水量大于1 m3/h的井共114口,约占钻井总量的87%。实践表明选频法在浅层地下水勘探中是实用可行的。在实践应用和以往研究成果的基础上,设计均匀半空间内球形充水岩溶的简单模型,以便解析求解并计算分析地表主剖面上二次电场的大小;计算结果表明,水平交变磁场产生的二次电场是一个相对高电位异常,而水平交变电场才产生相对低电位异常,由此推断天然电场选频法在地下水勘探中异常的形成主要是由于地下天然交变电场分量作用的结果。
Through practical application,theoretical deduction and simulation calculation,the validity of the frequency selection method of natural electric field in shallow groundwater exploration was illustrated,and the natural field source component which plays a major role in the formation of anomaly was analyzed.The method had been applied to 12th Five-Year Plan of the rural drinking water safety project by No.273 Geological Party of Guangxi in 2013~2015.According to its exploration results,a total of 131 wells were drilled.114 wells'water output was more than 1m 3/h,accounting for about 87.0%of the total amount of drill holes.The practical application shows that the frequency selection method is practical and feasible in shallow groundwater exploration.On the basis of practical application and previous research results,a spherical water filled karst model in uniform half space was designed,and the magnitude of the secondary electric field on the main section of the surface was calculated by using analytic method.The calculated results show that the horizontal alternating magnetic field produces a relatively high potential anomaly,whereas the horizontal alternating electric field produces a relatively low potential anomaly.It can be concluded that the formation of anomaly of frequency selection method in groundwater exploration is mainly due to the effect of alternating electric field components.
作者
杨天春
梁竞
程辉
曹书锦
董绍宇
宫玉菲
YANG Tian-Chun;LIANG Jing;CHENG Hui;CAO Shu-Jin;DONG Shao-Yu;GONG Yu-Fei(School of Resource,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;No.273 Geological Party,Guangxi Guigang Engineering Geological Investigation Institute,Guigang 537101,China;Engineering Research Center for Advanced Mining Equipment,Ministry of Education,Hunan University of Science and Technology,Xiangtan 411201,China)
出处
《物探与化探》
CAS
CSCD
北大核心
2018年第6期1194-1200,共7页
Geophysical and Geochemical Exploration
基金
湖南省教育厅资助科研项目(16K031)
湖南省自然科学省市联合基金资助项目(2016JJ5023)
关键词
天然电场选频法
地电场
地下水
电磁场
游散电流
frequency selection method of natural electric field
geoelectric field
groundwater
electromagnetic field
stray current
