基于Parker算法的磁性双界面模式正反演研究

Magnetic Interfacial Inversion Using Dual Interface Pattern Based on Parker Algorithm

Parker界面反演算法中包含了一个不稳定因子——向下延拓算子,导致其不稳定,通常的做法是在反演过程中加入一个低通滤波器以限制高频振荡。这种做法在消除高频假波的同时会对有效信号进行一定的压制,造成反演精度的降低。重新推导了正反演公式,提出了双磁性界面模式正反演公式和解决反演发散问题的方法。双界面模式正反演公式在实际应用中更具合理性和普适性,解决反演发散问题的方法保证了反演过程能够稳定收敛。讨论了算法实现的关键技术和措施,通过模型实验分析算法的精度和可用性,可以发现算法计算精度很高,误差为0.8%～4%,且具有一定抗噪性。用该方法处理中国某地磁测数据,得到较好效果。

A unstable factor,that was a downward continuation operator was included in Parker interface inversion,by which unsteady was caused.The common practice was to put a low pass filter in inversion to control the high frequency oscillation.This method was to avoid high frequency false wave and compress the effective signals and cause the decrease on inversion precision.The inversion formula was rederived.Formulae for inversion of dual magnetic interfacial pattern and a method for solving the problem of inversion divergence were proposed.The forward inversion equation is rational and adaptable in application,an approach is provided for solving the inversion divergence ensuring the convergence.Key techniques and measures for implementing the algorithm are discussed.Modeling is used to prove its accurate and adaptability,it can be found that the method is high accuracy with error of 0.8% to 4%.The method is used for magnetic data processing,better effect is obtained.