三角波场源航空瞬变电磁测量的高度校正方法分析

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。

Effect analysis of wide field electromagnetic method for Jinqingding gold deposit in Muping-Rushan metallogenic belt, Jiaodong

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 paper focuses on such a data processing method of altitude correction. Through the analysis of this 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 based on 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.