摘要
中心回线装置下水平地层的时间域电磁场表达式为双重积分,内层为汉克尔型积分,外层为正弦或余弦积分,线性数字滤波法是求解此类特殊积分的有效方法。这里采用线性数字滤波法分别计算了均匀半空间、两层和三层介质共七种地电断面的电磁响应,分析了不同类型响应曲线的形态特征,研究了中间层厚度变化和底层电阻率变化对时间域响应曲线形态的影响。通过对比与分析,得出了一些规律性的认识,对于瞬变电磁数据的处理解释具有一定的指导意义。
The expressions of time-domain electromagnetic fields with a central-loop on the layered earth are double integrals.The inner integral is Hankel transform while the outer integral is sine transform or cosine transform.Linear digital filtering is an effective method to solve such special integrals.The electromagnetic responses for half space,two-layer and threelayer models have been calculated with linear digital filtering method,and the response curves for the seven types(half space,G,D,A,K,H and Q)have been analyzed,and time-domain responses of layered models with changing interlayer-thickness and underlayer-resistivity have been studied.By comparing and analyzing,some regular cognitions are drawn,which have certain guiding significance for transient electromagnetic data's processing and interpretation.
出处
《物探化探计算技术》
CAS
CSCD
2015年第5期560-565,共6页
Computing Techniques For Geophysical and Geochemical Exploration
基金
中央级公益性科研院所基本科研业务费项目(AS2013P01)
关键词
汉克尔积分变换
正弦变换
余弦变换
线性数字滤波
瞬变电磁响应
Hankel integral transform
sine transform
cosine transform
linear digital filtering
transient electromagnetic response
