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基于地球物理正则化反演理论,详细给出了目前常用的三种大地电磁(MT)二维反演方法——奥可姆法(OCCAM)、简化基奥可姆法(REBOCC)和非线性共轭梯度法(NLCG)的理论基础.设计了两个理论地电模型,一个是高、低阻体组合模型,另一个是断裂模型,使用这三种MT二维反演方法分别对TE极化模式、TM极化模式以及TE&TM极化模式响应数据进行了反演,对反演结果进行对比分析,考察了不同的反演方法以及不同的极化模式对反演结果的影响.研究结果表明:三种反演方法有各自的特点,使用不同的极化模式数据反演将会得到不同的反演效果.
Based on the geophysical regularization inversion theory, three commonly used two-dimensional MT (MT) two-dimensional inversion methods are presented in detail: OCCAM, REBOCC and nonlinear Conjugate Gradient Method (NLCG) .Two theoretical geoelectric models are designed, one is a combination of high and low resistive body and the other is a fracture model. The three-dimensional MT inversion method is used to measure the TE pole Inversion mode, TM polarization mode and TE & TM polarization mode response data, the inversion results were compared and analyzed, and the effects of different inversion methods and different polarization modes on the inversion results were investigated. The results show that : The three inversion methods have their own characteristics, using different polarization mode data inversion will get different inversion results.