摘要
根据长江中下游九瑞矿集区武山外围地区的区域地质背景、成矿条件和岩石物性特征,在该区开展音频大地电磁测深法(AMT)的剖面性测量研究。首先对AMT原始时间域数据进行平移去噪、线性插值拟合去噪和应用经验态分解去噪,从而达到消除噪声,还原数据真实地电信息的目的,然后通过傅氏变换将时间域数据转换成频率域数据,再对频率域数据进行二维反演解释,推测了地下2 km以内的电阻率差异较大的岩性接触带和断裂构造。结合该区的地质资料和钻探结果,二维反演结果表明音频大地电磁法能够很好地探测地下目标地质体,清晰划分出标志性地电层及其分层结构。
According to the geological background, metallogenic conditions and petrophysical characteristics in the surveyed area, three-dimensional geological mapping was studied by Audio-frequency Magnetotellurics Method （ AMT） . Based on AMT raw data pro-cessing and inversion interpretation, the authors inferred the underground resistivity differences of lithology and fracture structure within 2 km from the contact zone. Combined with the geological data and drilling results, the authors hold that the audio magnetotelluric method is good for detecting the underground geological body, clearly recognizing the marker bed of geoelectric layer and its hierarchi-cal structure.
出处
《物探与化探》
CAS
CSCD
2015年第1期100-103,共4页
Geophysical and Geochemical Exploration
基金
中国地质调查局基础调查部项目(1212010981005)
关键词
音频大地电磁法
深部勘查
地电层
电阻率
二维反演
岩性接触带
剖面性测量
Audio-frequency Magnetotelluric Method （AMT）
deep exploration
geoelectric layer
resistivity
two-dimensional inver-sion
lithologic contact zone
profile measurement
