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NLCG(Nonlinear conjugate gradients algorithm)算法广泛应用于音频大地电磁法(AMT)二维反演中,并且取得了良好效果。本文介绍了NLCG方法的基本理论,并应用该方法对不同的反演模式和不同的背景电阻率所得的反演结果分别进行对比,结果表明:二维NLCG反演方法TE和TM模式联合反演效果比单个TE、TM模式较好;选择异常体所在层围岩的电阻率作为背景电阻率是最佳选择。
The algorithm of NLCG (Nonlinear conjugate gradients algorithm) is widely used in the 2D inversion of AMT and has achieved good results. In this paper, the basic theory of NLCG method is introduced and compared with the inversion results obtained by different inversion models and different background resistivities. The results show that the two-dimensional NLCG inversion method combined with TE and TM model inversion The effect is better than that of single TE and TM modes. It is the best choice to choose the resistivity of the surrounding rock of the abnormal body as the background resistivity.