航空电磁法筛选金属矿异常技术研究

摘 要] 航电异常筛选是把航电基岩导体异常选出来进行编录和推断解释,把人文导体、气流扰 动、飞机剧烈动作、复盖层导体等引起的干扰和假异常剔除掉。本文基于国内完全自主研发的HDY- 402 三频航空电磁测量系统及方法技术,对典型模型进行计算,总结了三频航电的异常响应变化规律。 重点介绍了金属矿航电基岩导体异常、干扰异常的基本特征和异常筛选步骤。实践证明,只有充分认识 航电异常的基本特征,合理选择筛选步骤,航电异常筛选才能具有有效性和科学性,从而提高优选的矿 化有望异常的可靠性。

Screening Metal Ore Anomalies using the Aeroelectromagnetic Method

Abstract:Aeroelectromagnetic (AEM) anomaly screening is to document and explain the selected bedrock-conductor anomalies,and to eliminate the interference and false anomalies caused by the human conductors,air-current disturbances,aircraft violent actions and cover conductors. This paper calculated several typical models based on the completely domestic self-developed three-frequency aero-electromagnetic system and the measuring method,and summed up the anomaly responses based on three-frequency AEM. The basic characteristics of the bedrock-conductor anomalies related to metal ores and interference anomalies,and the steps of abnormal screening are presented. It is practically proved that only by fully understanding of the basic characteristics of AEM anomalies and reasonable choice of the screening procedures,AEM anomaly screening can be effective and scientific,which permits enhancement of the reliability of the selected mineralization anomalies.