大地电磁测深资料去噪方法应用研究

An application study of noise elimination formagnetotelluric sounding data

1. 中国地质大学地球物理系,湖北武汉430074;2. 华东有色金属勘查局八一四队,江苏镇江212005;3. 有色金属矿产地质调查中心北京中色物探有限公司,北京100073

1. Department of Geophysics,China University of Geosciences,Wuhan 430074,China;2. Team 814 of East China Nonferrous Geologic Exploration Bureau, Zhenjiang 212005, China;3. Beijing Zhongse Geophysical Exploration Co. Ltd., of Geological Investigation Center for Nonferrousmetalmineral Resources, Beijing 100073, China

系统地研究了大地电磁测深中几种去噪处理方法的原理、实质及效果,并以一些MT实际勘探测点实例予以佐证。理论与实例证明不同方法各有其优点,但概括起来Robust估计效果优于常规处理方法,远参考处理效果优于Robust估计。在具体工作中,应当从实际具体情况出发,因地制宜,依据工区干扰背景与经济成本合理加以应用。

The principles and effects of some noise eliminationmethods used for processingmagnetotelluric sounding data are compared and illustrated with realmT data.Theoretical and case studies show that eachmethod has its own advantages.To sum up, robust estimation is superior to conventional least squaremethod, and remote reference technique is better than robust estimation.In practice, noise eliminationmethod should be chosen and rationally utilized according to the background noise level, conditions of data acquisition, and exploration cost.