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磁性体受磁化方向的影响往往使异常形态发生畸变,因此不可以直接利用原始异常来估算场源体的深度和类型。二维情况下磁异常的解析信号具有不受磁化方向干扰的特性,本文提出一种基于解析信号水平与垂直导数的自动磁异常解释方法。首先利用解析信号的性质推导出一线性方程,该方程在无任何先验信息的情况下就可以计算出磁性体的位置参数,然后利用获得的位置参数计算场源的构造指数。通过模型产生的磁异常试验本文方法的可行性,结果证明本文方法能成功地计算出不同类型场源体的位置和构造指数,且受噪声干扰较小。最后将本文方法应用于解释实测磁异常,获得了未开采铁矿的分布情况,且与已知矿体的分布形态相一致。
The influence of the magnetization direction of the magnetic body often distorts the abnormal shape, so the original anomalies can not be directly used to estimate the depth and type of the field source body. In the two-dimensional case, the analytic signal of magnetic anomaly has the characteristic of being independent of magnetization direction. In this paper, an automatic magnetic anomaly interpretation method based on analytic signal level and vertical derivative is proposed. First of all, a linear equation is deduced by analyzing the properties of the signal. The equation can calculate the position parameter of the magnetic body without any prior information and then calculate the structure index of the field source by using the obtained position parameter. The magnetic anomalies produced by the model are tested to verify the feasibility of the proposed method. The results show that the proposed method can successfully calculate the location and tectonic index of different types of field sources and have less noise interference. Finally, this method is applied to explain the measured magnetic anomalies, obtained the distribution of undeveloped iron ore, and is consistent with the distribution of known ore bodies.