边界增强法在航磁数据处理中的应用

The application of the edge enhancement methods to aeromagnetic data processing

在航磁调查工作中,研究区断裂构造与成矿关系密切,为了确定断裂构造的分布,尝试使用多种边界增强法。笔者介绍了三种边界增强方法,包括Tilt-Depth法、非绝对值斜导数水平导数法和Theta图法。通过实例探讨各种边界增强法与向上延拓联合应用的效果,结果表明:各种边界增强法均可识别断裂构造位置,Tilt-Depth法在判断断裂构造埋深上具有优势;非绝对值斜导数水平导数法更能突出一些细小的异常部分,可以判断断裂构造产状;Theta图法效果要优于其它的边界增强法,识别精度较高。应用研究表明,与向上延拓联合使用更能充分体现边界增强法在航磁资料综合解释方面的优势。

In airborne magnetic survey,the fault structure has great influence on the formation of orebodies in this mining area.In order to identify the fault structure distribution of the study area, the authors tentatively applied the edge enhancement methods.This paper mainly introduces three edge enhancement methods, i.e., the tilt-depth, the non-absolute value of total derivative and the Theta angle. Meanwhile, it discusses the effects of various edge enhancement methods in combination with the upward continuation method through examples.The results suggest that various edge enhancement methods can identify the location of the fault structure, and that the tilt- depth method has an advantage in determining the depth of the fault structure.The non-absolute value of total derivative method can em- phasize some small exceptions, and can also determine the attitude of fault structure.Theta angle method is superior to the other edge en- hancement methods,and it has a higher recognition accuracy. The study results show that the combination of the edge enhancement methods and the upward continuation method can embody the advantages of the aeromagnetic data used in comprehensive interpretation.