Edge effects and canceling measure of transient electromagnetic central loop configuration

摘要：

The central loop configuration is one of configurations mostly used in transient electromagnetic survey and its apparent resistivity is usually derived from the field expressions of the loop source center.However,in actual field exploration,the measurement is taken out only in one-third area of the center of the transmitter loop in order to increase the working efficiency.The analysis on field distribution characteristics shows that the difference of induced electromotive force (EMF) between measuring at the central point and at the edge of the measuring area ranges from 15% to 25%,which can not be ignored as compared with anomalies caused by collapse columns and conducting small faults buried at the depth of 800-1000 m widely being in the North China type coal measures.The research indicated that the apparent resistivity based on induced EMF equation of the large rectangular loop source can eliminate the above stated edge effects very well and make the measurement keep in near field zone to enhance the data interpretation precision of coal field hydro-geological exploration.

关键词： transient electromagnetic method central loop configuration edge effects large rectangular loop source apparent resistivity

作者: Xianxin Shi Shu Yan Junmei Fu

作者单位: School of Electronic and Information Engineering, Xian Jiaotong University, Xi an 710049, China Xi School of Computer Science and Telecommunication Engineering, Jiangsu University, Zhenjiang 212013,C School of Electronic and Information Engineering, Xian Jiaotong University, Xi an 710049, China

会议类型: 国际会议

会议名称: The 3rd International Conference on Environmental and Engineering Geophysics(第三届环境与工程地球物理国际会议)

会议地点: 武汉

会议语种:英文

页码: 362-367

在线出版日期: 2008-06-15（万方平台首次上网日期，不代表论文的发表时间）