摘要
我国南方大部分地区为喀斯特地貌 ,灰岩出露 ,溶洞发育 ,地表持水性差 ,但地下暗河发育。本文介绍应用浅层瞬变电磁法进行岩溶水勘探的方法试验。试验中采用了旁侧效应小的中心回线测量方法 ,数据处理采用了时间域电阻率成像算法 ,获得了较高分辨率的电阻率剖面 ,在三条处理的剖面中发现了五个异常体 ,并按异常体的大小进行了等级划分。根据电法勘探的结果和水文资料综合分析 ,在一号异常上钻井至 75m深处出水。
Most of Southern China mountain areas are karst topography with surface widely covered by carbonate rock and kasrt caves well developed underground. The ground surface can not hold water properly for the people＇s daily life, but the underground streams may be widely distributed along caverns in karst area. In this paper, an exploration trial for water in karst caverns with shallow transient electromagnetic method （TEM） was carried out. Central loop configuration which has little side effect was used in filed survey, and the effective resistivity imaging method in time-domain was adopted for data processing, thus resistivity-depth profiles with high resolution were obtained. Five electric anomalies among three profiles were mapped out and sorted according to their features. Drilling was carried out on the No. 1 anomaly, and water was found at the depth of 75m, which is in good agreement with the predicted depth according to the resistivity anomalies. The results showed that the TEM is successful for underground water exploration in karst caverns.
出处
《工程地球物理学报》
2004年第1期83-85,90,共4页
Chinese Journal of Engineering Geophysics
关键词
瞬变电磁测深
电阻率成像
岩溶水
找水
TEM
resistivity imaging
karst caverns
underground water exploration.
