航空地球物理勘探资料微调平处理  

MICROLEVELLING PROCESSING OF AIRBORNE GEOPHYSICAL DATA

作　　者：骆遥[1] 王林飞[1] 何辉[1] 

机构地区：[1]中国国土资源航空物探遥感中心,北京100083

出　　处：《物探与化探》2012年第5期851-855,共5页Geophysical and Geochemical Exploration

基　　金：863国家高技术研究发展计划项目(2006AA06A208)

摘　　要：航空物探测量中测线间水平往往存在差异,表现为沿测线方向的条带。调平处理旨在减少或消除测线间的水平差,是航空物探资料处理中的关键,对航空物探资料处理和解释具有重要作用。笔者以实际的航磁资料处理为例,详细介绍了航空物探资料微调平处理的原理与实现。微调平处理中首先通过方向滤波从原始资料中提取噪声网格,并按飞行测线提取噪声网格中的数据并分离有用的地质信息,最终将分离后的测线水平误差从原始资料中去除得到调平后资料,以此实现航空物探资料的微调平处理。同时,针对资料处理中遇到的诸如滤波器选取、异常分离阈值确定、最终调平效果检验等实际问题进行讨论,这对理解微调平并应用于实际资料处理均具有意义。Airborne geophysical data often suffer from corrugations or line level errors, which can be adjusted or removed by using level- ling procedure. Levelling is a critical step in airborne geophysical data processing and interpretation. Microlevelling routine can be ap- plied to removing the remaining line level after tie line leveling. Based on practical aeromagnetic data levelling, the authors deal in de- tail with the principle of microlevelling and key steps in microlevelling procedure. For the purpose of microlevelling data, a directional high pass filter perpendicular to the flight line direction is first employed to produce a decorrugation noise grid. The noise grid is then extracted as new channel flight data. Amplitude limiting and low pass filtering can be applied to the noise channel so as to remove the residual geological signal and leave only the component of line level drift, which is then subtracted from the original data to produce the final microlevelled data. This paper has also discussed some key technical problems in airborne geophysical data leveling, especially in microlevelling. The discussion in this paper may be useful in practical data processing.

关 键 词：航空物探 资料处理 微调平 测线水平 

分 类 号：P631[天文地球—地质矿产勘探]