瞬变电磁模型映射反演

On Transient Electromagnetic Model Mapping Inversion

由瞬变响应曲线随地下电导率、发射回线边长与观测时间的平移伸缩特性,近似反演地下介质的电性参数,并称之为视模型,再根据视模型与真模型的加权平均模型之间存在的一一映射关系,应用关系映射(RMI)原理,提出一种新的瞬变电磁模型映射反演方法,并对该算法的收敛条件及收敛速度进行了分析和讨论。映射反演算法无需计算反演灵敏度矩阵,具有算法稳定、收敛速度快的优点,值得推广。

Based on the translational stretching characteristic of transient response curve with the underground conductivity,transmitter loop length and observation time,we can make inversion on the approximated subsurface electrical parameters,which is called apparent model.According to the existing of one mapping relationship between the apparent model and the weighted average model of the true model and applying the relational mapping（RMI）principle,a new model mapping inversion method for transient electromagnetic data is proposed and then analyze and discuss the convergence conditions and convergence rate of this algorithm.Mapping inversion algorithm is worth promoting,because it has the advantages of not calculating the inversion sensitivity matrix with stable algorithms and fast convergence.