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《Oil Geophysical Prospecting》 2017-06
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Application of magnetic field correlation in remote reference magnetotelluric data processing

Zhang Gang;Tuo Xianguo;Wang Xuben;Gao Song;Ding Mingtao;School of Environment and Resource,Southwest University of Science and Technology;Chengdu Geological Survey Center,China Geological Survey;Institute of Geophysics,Chengdu University of Technology;  
We discuss in this paper applications of magnetic field correlation in remote reference magnetotelluric processing.We first analyze the influences of remote reference magnetotelluric on sounding curves with different noise level at the base station.The following phenomena are found:a.The sounding curve quality with a low signal-noise ratio cannot be improved by conventional remote reference magnetotelluric methods;b.Based on statistics of some magnetic survey data,there is a strong correlation among magnetic signals at sounding points with the maximum distance of 40 km in Panxi Area.On this basis,a magnetic field correlation method between base stations and the reference stations using remote reference magnetotelluric data is proposed in order to screen out power spectra and eliminate the noise.Test results on experimental data and measured data prove the effec tiveness and correctness of the proposed method,and show better effects than conventional remote reference magnetotelluric methods.
【Fund】: 国家自然科学基金项目(41704105);; 中国博士后科学基金项目(2017M610611);; 国家“863”计划项目“长周期分布式大地电磁观测系统”(2014AA06A612);; 国家重大科学仪器设备开发专项“大深度三维电磁探测技术工程化开发”(2011YQ05006007)联合资助
【CateGory Index】: P631.325
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