摘要
物探方法是寻找地下水的重要勘查手段之一。在查明区域水文地质条件的基础上,本文采用音频大地电磁测深和高密度电阻率法对海南省琼中县榕木村花岗岩区深部赋水断裂破碎带的位置、深度、规模和产状特征进行了探测,结果表明:赋水断裂破碎带主要表现为“凹槽”状或“条带”状低阻异常;可以采用激电半衰时(Th)、偏离度(r)以及视电阻率(ρs)等参数进行断裂破碎带含水层位置判别。通过水文地质钻探揭露,含水层位置与物探解译结果基本一致,证明激电半衰时和偏离度以及视电阻率等参数可以较可靠地确定赋水构造的位置和深度。综合物探勘查方法为水文地质钻井孔位设计提供了有效技术支撑,可对在类似地区进行地下水探测提供参考。
Geophysical prospecting is one of the important exploration methods to find groundwater.Based on the investigation of regional hydrogeological conditions,the authors mainly used the audio-frequency magnetotelluric sounding and high density resistivity to detect the location,depth,scale and occurrence of the deep water-bearing fault in the Rongmu granite area,Qiongzhong County,Hainan Province.The water-bear-ing fracture zone shows the groove-or strip-shape low resistance anomaly,and can be identified its aquifer position according to its IP half decay time(Th),deviation degree(r)and apparent resistivity(ρs).The hydro-geological drilling revealed the aquifer location to be basically consistent with the result of geophysical inter-pretation,which proves that the above comprehensive method can be used to accurately determine the location and depth of water-bearing structures.The comprehensive geophysical exploration provides both effective technical support for borehole location design of hydrogeological drilling and useful experience for future groundwater exploration in other similar areas.
作者
任磊
代涛
齐信
薛宝林
焦尚斌
REN Lei;DAI Tao;QI Xin;XUE Bao-Lin;JIAO Shang-Bin(519 Team of North China Geological Exploration Bureau,Baoding 071051,Hebei,China;Wuhan Center of China Geological Survey,Wuhan 430205,Hubei,China;Faculty of Engineering,China University of Geoscience,Wuhan 430074,Hubei,China)
出处
《华南地质》
CAS
2021年第3期321-329,共9页
South China Geology
基金
中国地质调查局项目“海口江东新区综合地质调查(DD20190304)”。
关键词
音频大地电磁测深
高密度电阻率法
地下水勘查
花岗岩区
海南琼中县
audio magnetotelluric sounding
high density resistivity method
groundwater exploration
Granite area
Qiongzhong County,Hainan
