深度视电阻率成像在航空瞬变电磁法探测矿体的研究及应用

Research and application of RDI in detecting orebody by aeronautical transient electromagnetic method

深度视电阻率成像是航空瞬变电磁法中数据处理及分析的重要过程,能够提供具有参考价值的导体深度、垂向延伸等信息,并能准确提供每条航空瞬变电磁测量系统测线上的一维层状介质视导电率结构断面.而航空瞬变电磁法作为一种先进的地球物理勘探技术,近年来在国外多金属矿产勘查中应用效果显著.本文简要介绍了视电阻率的分析处理方法,以几组不同导体的MAXWELL板状模型为例,计算一维视电阻率深度,得到直观的视电阻率深度成像图.此项技术首次在黄土坡矿床开展测量试验的处理中,获得良好的效果,加快了航空瞬变电磁法的处理工作进程.

The RDI is an important process for data processing and analysis in aeronautical transient electromagnetic methods,providing information on conductor depths and vertical extensions with reference values and accurate information on each aeronautical transient electromagnetic measurement system of the onedimensional layered dielectric as the conductive structure of the cross-section. Airborne transient electromagnetic,as the advanced geophysical prospecting technology,has significant effect application in polymetallic mineral exploration in oversea countries. The apparent resistivity is calculated,and the RDI is obtained using the one-dimensional apparent resistivity depth calculated by Meju. RDI has a good result in the application of airborne transient electromagnetic measurement experiment in Huangtupo,and it will speed up the process of airborne transient electromagnetic processing.