基于航磁垂向分量的二度体场源深度识别方法研究
Field Source Depth Identification Method of Two-Dimensional Body Based on Aeromagnetic Vertical Component

本文提出了一种基于航磁垂向分量的二度体场源深度识别方法。从无限延伸水平圆柱体磁异常垂向分量的正演公式出发，给出了利用极大值估算异常中心埋深的表达式，并在此基础上提出了约束条件下的深度估算方法，此方法具有计算简便、快速、易于操作等优点。通过两组无限延伸水平圆柱体模型计算结果表明，约束条件下的深度估算方法结果均优于常规极大值深度估算方法，其深度估算偏差均值为3.16%。将此方法应用于我国北部某地区的实测航磁垂向分量数据，与钻孔资料相对比，其深度估算偏差均小于5%，进一步验证了该方法的有效性。
A method for depth identification of two-dimensional field source based on aeromagnetic vertical component is proposed in this paper. Based on the forward formula of vertical component of magnetic anomaly for infinitely extended horizontal cylinder, the expression for estimating the buried depth of anomaly center by maximum value is given, and a depth estimation method under constraints is proposed. This method has the advantages of simple calculation, fast operation and so on. The calculation results of two groups of infinite extension horizontal cylinder models show that the depth estimation method under constraints is superior to the conventional maximum depth estimation method, with the mean deviation of 3.16%. This method is applied to the measured aeromagnetic vertical component data in a certain area in northern China. Compared with borehole data, the deviation of depth estimation is less than 5%, which further verifies the effectiveness of this method.