广域电磁法H-H_z方式波数域的一次场特征  

Wave-Number Domain Features of Primary Field of H-H_z Arrangement Wide Field Electromagnetic Method

作　　者：王顺国[1,2] 熊彬[2] 王有学[2] 李长伟[2] 

机构地区：[1]中南大学地球科学与信息物理学院,长沙410083 [2]桂林理工大学地球科学学院,广西桂林541004

出　　处：《桂林理工大学学报》2012年第2期179-183,共5页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(40974077;41164004);国家高技术研究发展计划项目(2007AA06Z134);广西自然科学基金项目(2011GXNSFA018003);广西高校优秀人才资助计划项目资助

摘　　要：电磁法2.5维正反演中,逆傅里叶变换是不可缺少的步骤,而波数选取是否合理决定逆变换精度。以广域电磁法H-Hz方式为例,从多个角度进行计算分析,讨论了波数域中一次场hz的特征及相关问题。结果表明,波数域中磁场曲线形态与空间域是相似的,且过大的波数对应的磁场值非常小,对提高计算精度没有帮助。选取了一组波数,经验证是合理的。从计算结果看,Chave算法的积分结果比Anderson算法的精度要高。In the 2.5D forward and inverse modeling of controlled source electromagnetic method （ CSEM）, inverse Fourier transform is unavoidable, whether the results are right or wrong is decided by the wave-numbers. In order to research the key point, the wave-number domain primary field of H - Hz wide field electromagnetic method is calculated, the corresponding features are analyzed at the same time. The conclusions show us that both in space domain and in wave-number domain, the characteristics of magnetic curves are alike. Besides, large wave-number leads to very smaller magnetic value. These only can waste the time, but have no use for improving the precision of the results. A group wave-numbers are selected which is reasonable. The computation of the Chave＇s algorithm is superior to the Anderson＇s algorithm.

关 键 词：广域电磁法 波数域 一次场特征 Chave算法 Anderson算法 

分 类 号：P631.325[天文地球—地质矿产勘探]