摘要
瞬变电磁法的探测深度主要与观测时间有关。发射回线的尺寸主要是使信号具有一定的强度,以满足接收机灵敏度和信噪比的要求。当对小发射回线装置供以大电流时,同样可以得到和大发射回线相当的信号强度。大发射回线施工中的边缘效应是目前影响探测精度的原因之一,小发射回线装置避免了这个缺陷。云南、湖南和邢台等地的实际探测结果表明,小发射回线装置最大探测深度达800 m,资料解释结果与工程中的揭露、钻孔资料及地质资料一致。
In transient electromagnetic exploration, the depth of investigation is related to the observation time. The size of transmitter loop is mainly for strength of signal to satisfy reviver sensitivity and signal to noise ratio. When supplying a small transmitter loop device with power current,the strength of signal as same as that produced by a large transmitter loop can be obtained. At the present time,detecting precision is subject to the edge effect of large loop configuration and the small loop device avoids this objection.The practice prospecting results in Yunnan, Hunan and Xingtai show that the most deep depth of investigation is up to 800 m by small loop device and the interpretations are agreeable to the facts revealed in engineering, drill data and geological data very well.
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2007年第3期66-68,共3页
Coal Geology & Exploration
关键词
瞬变电磁法
小发射回线
大发射回线
边缘效应
信号强度
transient electromagnetic method
small transmitter loop
large transmitter loop
edge effect
strength of signal
