二维大地电磁数据的聚焦反演算法探讨

 文中简要分析了当前地球物理反演中几种常用的模型目标函数，并根据聚焦反演成像方法的基本理论，在大地电磁反演目标函数中引入了一个新的稳定泛函，以代替传统最小构造或最大平滑准则下的模型目标函数。通过对自适应正则化共轭梯度法解最优化问题过程的研究，以及对几个典型模型的试算，并将其结果与传统反演算法结果进行对比分析，表明了本文方法的正确性和较高的计算精度。最后对雷—琼拗陷一条实测的测线的MT资料进行聚焦反演成像处理，并与同一测线的地震资料进行对比表明,聚焦反演结果具有很高的准确性。

Discussion on focus inversion algorithm of 2-D MT data

The paper briefly analyzed several objective functions of models in current geophysical inversion, and on the basis of the basic theory of imaging approach by focus inversion introduced a new stable function in objective function of MT inversion to replace the objective function of model under the traditional minimum structure or maximum smoothing criterion. Through study on the process of solving the optimum problem by adaptive normalized conjugate gradient approach, making the tests of several typical models and correlating the results with that by traditional inversion algorithms, it can show the correctness of the method in the paper and higher computational precision. Finally, the imaging processing of focus inversion was carried out on the real MT line data in Lei-Qiong depression, which showed higher correctness of the result in comparison with the same lin-e's seismic data.