大地电磁多参考站阵列数据处理方法  

Multi-reference array MT data processing method

作　　者：周聪[1,2] 汤井田 原源[1] 邓居智 石福升 李勇[2] ZHOU Cong;TANG Jingtian;YUAN Yuan;DENG Juzhi;SHI Fusheng;LI Yong(State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang,Jiangxi 330013,China;Key Laboratory of Geophysical Electromagnetic Probing Technologies,Ministry of Natural Resources,Langfang,Hebei 065000,China;Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring(Central South University),Ministry of Education,Changsha,Hunan 410083,China;Technical Innovation Center of Coverage Area Deep Resources Exploration,Ministry of Natural Resources,Hefei,Anhui 230001,China)

机构地区：[1]核资源与环境国家重点实验室(东华理工大学),江西南昌330013 [2]自然资源部地球物理电磁法探测技术重点实验室,河北廊坊065000 [3]有色金属成矿预测与地质环境监测教育部重点实验室(中南大学),湖南长沙410083 [4]自然资源部覆盖区深部资源勘查工程技术创新中心,安徽合肥230001

出　　处：《石油地球物理勘探》2020年第6期1373-1382,1167-1168,共12页Oil Geophysical Prospecting

基　　金：国家重点研发计划“深地资源勘查开采”重点专项“地面地球物理勘探关键技术与装备”(2018YFC0603202);国家自然科学基金项目“混场源阵列电磁数据处理方法研究”(41904072);自然资源部地球物理电磁法探测技术重点实验室开放基金课题“大地电磁多点远参考阵列数据处理技术研究”(KLGEPT201904);核资源与环境国家重点实验室(东华理工大学)开放基金项目“相山铀矿田电磁场数据特征与阵列数据处理应用研究”(NRE1919)联合资助

摘　　要：合理利用多远参考站数据是提高大地电磁(MT)数据处理质量的重要途径之一。从阵列电磁数据处理模型出发,提出一种多参考站阵列数据处理技术。首先,从测区内、外优选多远参考站数据,构建天然场占优的参考数据阵列;然后,利用稳健的主成分分析方法,从参考数据阵列中提取天然场源极化参数;最后,将该参数应用于目标测站阵列数据,以稳健估计方法计算目标张量阻抗。通过"死频带"畸变的实测MT数据计算实例,对比了所提方法与常规方法的处理效果,验证了该方法的有效性。结果表明,所提出的多参考站阵列数据处理方法可有效提高多参考站数据的利用率,可提高强噪环境下MT数据的处理质量,获得优于常规方法的处理结果,为MT"死频带"畸变数据的校正提供可行的解决方案。Rational use of multiple remote reference station data is an important way to improve the quality of magnetotelluric data processing.Based on a processing model of electromagnetic array,a data processing algorithm based on multiple reference stations is proposed in this paper.Firstly,select multiple remote reference stations from both inside and outside the measured area and construct a reference data array dominated by natural fields,then extract the polarization parameters of natural sources from the reference data array by robust principal component analysis;and finally apply the parameters to the target array,which is constructed by data from the stations to deal with,and estimate the target tensor impedance through robust estimation.A case study on real data with MT"dead band"distortions indicates that the algorithm proposed in this paper is more effective than conventional methods.The results show that the processing method based on multiple remote reference array stations can improve the quality of MT data processing in a strongly noisy environment and provide a feasible solution to correct MT data with"dead band"distortions.

关 键 词：电磁勘探 大地电磁 远参考 多参考站阵列 MT数据处理 

分 类 号：P631.325[天文地球—地质矿产勘探]