庐枞矿集区大地电磁探测及电性结构初探

Magnetotelluric Sounding in the Lujiang-Zongyang Ore-district and Preliminary Study of Electrical Structure

在庐枞矿集区开展大地电磁测深(Magnetotelluric,MT)工作,有助于研究庐枞矿集区区域地质结构、构造,同时,对强干扰地区大地电磁干扰信号规律的研究和MT数据的处理与解释水平的提高有着重要的理论意义。论文首先阐述了庐枞盆地的地质概况及深部MT探测的研究现状,接着介绍了庐枞矿集区大地电磁测深数据采集及相关实验研究,包括仪器的一致性实验、MT单点采集时间对比实验及数据质量评价等;然后对庐枞矿集区典型的大地电磁干扰类型进行了简单的分析,并讨论了矿山强干扰地区大地电磁信号去噪的方法;最后对庐枞矿集区大地电磁测深数据进行了人机交互的二维连续介质反演,并结合区域地质构造背景对剖面反演结果进行了初步的分析与解释。

Investigation of the telluric electromagnetic sounding （Magnetotelluric,MT） in the Lujiang-Zongyang ore-intensive area is conducive to studying the geological structures of this area.Meanwhile,it has important theoretical significance for MT signal law research in strongly interfered regions and MT data processing and interpretation.First,this study expounded the geologic aspects of the Lu-Zong basin and the current research state of the deep MT sounding method.Second,we introduced the data acquisition of MT sounding in the Lujiang-Zongyang ore intensive area and related experiments,such as consistency test of instruments,contrast experiment of single-point acquisition time using MT,and assessment of data quality,etc.Third,we analyzed the approaches to attenuate the noise of MT interference in the strongly interfered area in the mine.Finally,the magnetotelluric sounding data in the Lujiang-Zongyang deposit-intensive area were inversed using human-computer interaction 2-D successive medium.Combined with regional tectonic settings,the inversion results of some MT sounding profiles were probed and interpreted.