三角波场源航空瞬变电磁测量的高度校正方法分析  

A Height-Correction Method for Airborne Transient Electromagnetic Measurement of the Triangle-Wave Field Source

作　　者：田达志[1,2] 杨柳 杨望[1] 要悦稳[1] 翟伟林 李金富[1] 安娜 TIAN Dazhi;YANG Liu;YANG Wang;YAO Yuewen;ZHAI Weilin;LI Jinfu;AN Na(Geophysical Exploration Bureau of China Metallurgical Geology Bureau,Baoding,Hebei 071051;Institute of Mineral Resources Research,China Metallurgical Geology Bureau,Beijing 101300)

机构地区：[1]中国冶金地质总局地球物理勘查院,河北保定071051 [2]中国冶金地质总局矿产资源研究院,北京101300

出　　处：《地质与勘探》2022年第1期129-137,共9页Geology and Exploration

摘　　要：近年,我国在引进国外航空瞬变电磁测量系统后开展了一系列的生产活动,但尚未建立一套航空瞬变电磁数据处理规范,航空电磁测量数据处理技术仍有待进一步完善。其中航空瞬变电磁测量数据因存在起伏飞行,在低阻地区形成明显的干扰异常,需要进行飞行高度校正,本文主要讨论高度校正的数据处理方法。通过高度校正数据处理方法的分析,得出三角波场源瞬变场的衰减规律与频率域电磁场的规律近似,呈现近似指数衰减规律,采用该衰减规律的高度校正方法较好地消除了飞行高度起伏引起的干扰异常。因而建议三角波场源航空瞬变电磁法测量高度校正可以采用指数衰减规律。In recent years,China has carried out a series of production activities after introducing foreign airborne transient electromagnetic measurement systems.A set of airborne transient electromagnetic data processing specifications,however,have not been established,and the data processing technology of airborne electromagnetic measurement needs to be further improved.For instance,the airborne transient electromagnetic measurement data contain obvious interference anomalies in low resistance and low areas due to the existence of fluctuating flight,which requires flight altitude correction.This work discussed focuses on such a data processing method of altitude correction.Through the analysis of the correction method,it is concluded that the attenuation law of the transient field of the triangular-wave field source is similar to that of the electromagnetic field in the frequency domain,showing an approximate exponential attenuation.The height correction method using this attenuation law can better eliminate the interference anomalies caused by the flight height fluctuation.It is suggested that the exponential attenuation law can be used for the height correction of the airborne transient electromagnetic method of the triangle-wave field source.

关 键 词：航空瞬变电磁法 高度校正 傅里叶级数 指数规律衰减 

分 类 号：P631[天文地球—地质矿产勘探]