煤田地质与勘探2017，Vol.45Issue(4)：131-134,4.DOI:10.3969/j.issn.1001-1986.2017.04.023
对瞬变电磁测深几个问题的思考(三)——瞬变电磁场关断效应及全期视电阻率的普适算法
Suitable algorithm of transient electromagnetic turn-off effects and whole-stage apparent resistivity
摘要
Abstract
Firstly the transient electromagnetic(TEM) field convolution was given,and change rate of turn-off current is taken as a impact function,the field component of vertical step pulse excitation as the input signal.The convolution result is TEM response of arbitrary shape turn-off current.The current excitation pulse is regarded as a superposition of many vertical step function.The transient electromagnetic response of arbitrary current pulse excitation is induced by the superposition of step function response.When the measured value of TEM field and the turn-off current form are known,whole-stage apparent resistivity can be calculated by the method of programming.The paper gives two examples on TEM vertical magnetic field of slope turn-off current excitation of electric dipole source,a response of uniform half-space and all-time apparent resistivity,a response to the three K-type geoelectric section and whole-stage apparent resistivity.关键词
电流激发脉冲/瞬变电磁场/关断效应/卷积/叠加/全期视电阻率Key words
excitation pulse current/TEM field/turn-off effect/convolution/superposition/whole-stage apparent resistivity分类
天文与地球科学引用本文复制引用
陈明生,许洋鋮..对瞬变电磁测深几个问题的思考(三)——瞬变电磁场关断效应及全期视电阻率的普适算法[J].煤田地质与勘探,2017,45(4):131-134,4.基金项目
国家自然科学基金项目(41374150)National Natural Science Foundation of China(41374150) （41374150）
