大地电磁层状对称各向异性介质的遗传算法反演  

Magnetotelluric inversion for symmetrically anisotropic layered medium using genetic algorithms

作　　者：吾守艾力.肉孜 梁生贤[2] 王永华[2] 李富[2] WUSHOUAILI-Rouzi;LIANG Sheng-xian;WANG Yong-hua;LI Fu(Bureau of Land and Resources of the Karamay City,Xinjiang Karamay 834000,China;Chengdu Center,China Geological Survey,Chengdu 610081,China)

机构地区：[1]新疆克拉玛依市国土资源局,新疆克拉玛依834000 [2]中国地质调查局成都地质调查中心,成都610081

出　　处：《地球物理学进展》2018年第6期2477-2482,共6页Progress in Geophysics

摘　　要：在多数情况下,地下电阻率呈明显的各向异性特征,其反演求解的模型参数增多,解的非唯一性也变得更加严重,因而反演更加复杂.文章首先探讨了大地电磁测深(MT)对称各向异性介质的线性化解法,虽然可通过模型加权和数据加权使反演收敛稳定,但加权因子不易控制,所求解模型参数与理论参数相差较大.基于线性化解法中存在的困难,将非线性反演中的遗传算法引入到各向异性反演中,通过加入噪声的理论模型数据试算,初步验证了算法具有一定的可行性,其求解过程简便,求解结果能基本反映真实地电断面轮廓,且无需再加入加权因子.In most situations,the electricity structure of underground medium has obvious anisotropic characteristic,its model parameters of the inversion solution are increased. This causes the non uniqueness of solution is also becoming more serious,and the inversion is much more complicated.In this paper,we first discuss the linearization method of Magnetotelluric (MT)symmetric anisotropic media,Although the inversion convergence can be stabilized by model weighting and data weighting,the weighting factor is not easy to control,and the solution model parameters differ greatly from the theoretical parameters.Based on the difficulties in the linearization method,the genetic algorithm in the nonlinear inversion is introduced into the anisotropic inversion. By adding the theoretical model of the noise,the algorithm is proved to be feasible,and the solution process is simple,the solution results can basically reflect the true geoelectric profile,and no longer need to add the weighting factor.

关 键 词：大地电磁 对称各向异性 非线性优化 遗传算法 反演 

分 类 号：P631[天文地球—地质矿产勘探]