稳健的磁源参数计算方法及模型计算结果

Calculating method and model calculation results of sound magnetic source parameters

重磁异常的自动解析方法领域出现了大量的研究成果,形成了欧拉反褶积、场源参数成像等方法。场源参数成像方法能够自动计算出场源体埋深、倾向和形态,与欧拉反褶积相比较,场源参数成像因计算方法简单而备受重视。但是计算的不稳定性和对噪声的敏感性一直限制了方法的应用。采用基于小波分析方法进行求导,并在计算局部波数中采用解析展开的方法,避免直接除水平导数而出现奇点问题,采用解析信号的振幅作为分母,使计算稳定性大为提高。模型计算结果表明方法对单个异常体的计算具有很好的效果。

There are a lot of study results occurred in the field of automatically analytical methods of gravity and magnetic anomalies, and then Eulerian deconvolution, source parameter imaging method and so on are gradually produced. The latter method can automatically calculate the buried depth, dip and configuration of the source body. Comparing with the former, this method is more emphasized due to its simple calculation, but the calculation instability and the sensibility to all kinds of noises restrict the application of the method all the time. By means of wavelet analyzing method, the derivative has been resolved and at the same time analytical spreading method is adopted in the course of calculating partial wave number, so the strange point problem can be avoided when directly divided by horizontal derivative. By taking the amplitude of analytic signal as denominator, the calculation stability has been improved greatly. The results of model calculation show that the method has much better calculation effects to individual anomaly body.