瞬变电磁数据采集抗干扰措施评价方法  

THE EVALUATION OF TEM ANTI-INTERFERENCE MEASURES IN DATA ACQUISITION

作　　者：武军杰[1] 王兴春[1] 邓晓红[1] 吕国印[1] 张杰[1] 杨毅[1] 

机构地区：[1]中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000

出　　处：《物探与化探》2012年第B10期40-44,共5页Geophysical and Geochemical Exploration

基　　金：国家危机矿山接替资源勘查专项(200699066);公益性行业科研专项(200911017)资助

摘　　要：在煤田、矿区开展TEM勘查工作时,往往采取加大发射电流和发射面积、增加重复观测次数、迭加次数等抗干扰措施来获得符合要求的原始数据。为确定所采取抗干扰措施的有效性,建立相应的评价指标具有重要指导意义。为此,提出了TEM信噪比曲线的定义与统计方法,并提出用信噪比曲线评价抗干扰措施的有效性,认为信噪比大小变化能够真实反映原始数据的质量好坏及抗干扰措施是否有效。通过对矿区采取抗干扰措施后的实测数据进行统计分析,获得了不同措施下的信噪比资料。结果表明,本方法所得的信噪比参数易于统计,能够合理、有效地反应原始数据的质量以及抗干扰措施的应用效果。Anti-interference measures must be adopted in coalfield where noise level is heavy to guarantee the quality of data collected. The evaluation of parameters is necessary for understanding the effectiveness of the measures. TEM S/N and its calculation method are given in this paper to evaluate the effectiveness of the anti-interference measures. The TEM S/N data were statistically analyzed by u- sing field data processed with different measures, and the result shows that the S/N parameter can display the effectiveness reasonably and the calculation is easy.

关 键 词：瞬变电磁法 信噪比 抗干扰措施 煤田勘查 

分 类 号：P631[天文地球—地质矿产勘探]