基于遗传算法的地面可控源电磁法发射频率组合优化设计  

Optimizing the frequencies design of controlled-source electromagnetic method based on genetic algorithms

作　　者：李大俊 苏巍[1] 翁爱华[2] LI DaJun;SU Wei;WENG AiHua(College of Surveying and Prospecting Engineering,Jilin Jianzhu University,Changchun 130026,China;College of Geo-exploration Science and Technology,Jilin Jianzhu University,Changchun 130026,China)

机构地区：[1]吉林建筑大学测绘与勘查工程学院,长春130026 [2]吉林大学地球探测科学与技术学院,长春130026

出　　处：《地球物理学进展》2021年第6期2479-2485,共7页Progress in Geophysics

基　　金：国家重大科研仪器专项(2011YQ05006010)资助。

摘　　要：为了最大化观测数据对模型参数的分辨能力,本文介绍一种地面可控源电磁法发射频率组合优化设计方法.该方法根据灵敏度奇异值谱的光滑性质定义优化设计理论的目标函数,采用遗传算法全局搜索最优的频率组合.同时,在目标函数中引入面向地质目标靶区的模型参数,使观测数据对目标区域模型参数的分辨能力得到了提高.采用一维层状地电模型来验证上述优化理论的可行性,结果显示在发射频率个数减少47%的情况下,依然获得与标准频率组合一致的反演结果,提高了反演计算效率.该方法对优化可控源电磁勘探数据采集系统,提高可控源电磁勘探对地下异常体的分辨能力具有积极意义.We present a strategy that optimized frequencies design of Controlled-Source Electromagnetic Method(CSEM)for maximizing the resolution of observed data to model parameters.The objective function of the optimized design is defined by the smoothness characteristic of singular value spectrum for sensitivity matrix.For improving the resolution ability of the observed data to the target body,the sensitivity term for geological target model parameters is added into the mentioned objective function.Genetic algorithm is used to search the optimal frequencies design of CSEM.1-D layered model is carried out verify the feasibility of the above optimal design strategy.The inversion result that the number of frequencies is reduced by 47%agree well with the standard 17 frequencies,and the efficiency is significantly improved.The optimal frequencies design method will guide the establishment of the optimal data acquisition system for CSEM,and lay the foundation for improving the resolution ability to underground anomalous bodies.

关 键 词：可控源电磁法 频率组合 优化设计 遗传算法 

分 类 号：P631[天文地球—地质矿产勘探]