磁场相关性在远参考大地电磁数据处理中的应用

发布时间：2018-03-26 19:21

本文选题：大地电磁　切入点：远参考　出处：《石油地球物理勘探》2017年06期

【摘要】：首先分析了基站存在不同噪声强度时,远参考大地电磁对测深曲线的影响,发现在低信噪比条件下,常规远参考大地电磁数据对测深曲线质量的提升有限,不能满足后续资料处理的要求;然后对攀西地区实测磁场资料进行统计分析,结果认为最远相隔40km的长周期大地电磁测深点的各个磁道数据具有很好的相关性。因此提出利用基于参考站与基站之间磁场相关的远参考大地电磁法来筛选功率谱,避免了常规远参考大地电磁法仅关注噪声与信号之间、或者基站噪声与参考站噪声之间的非相关性,却未考虑基站与参考站磁场信号之间的相关性这一局限,以达到去除磁场噪声的目的。实验数据及实测数据处理结果表明,基于磁场相关的远参考大地电磁法效果优于常规远参考大地电磁法,证明了该方法的有效性和正确性。
[Abstract]:Firstly, the influence of remote reference magnetotelluric on the sounding curve is analyzed when the base station has different noise intensity. It is found that under the condition of low signal-to-noise ratio, the conventional remote reference magnetotelluric data can improve the quality of the sounding curve limited. Can not meet the requirements of subsequent data processing, and then statistical analysis of the measured magnetic field data in Panxi region, The results show that there is a good correlation between the longperiod magnetotelluric sounding data of the most distant 40km, so a far-reference magnetotelluric method based on the magnetic field correlation between the reference station and the base station is proposed to screen the power spectrum. It avoids the limitation that conventional remote reference magnetotelluric method only focuses on the non-correlation between noise and signal, or between base station noise and reference station noise, but does not consider the correlation between base station and reference station magnetic field signal. In order to remove the magnetic field noise, the experimental data and the measured data show that the effect of the magnetotelluric method based on magnetic field correlation is better than that of the conventional remote reference magnetotelluric method, which proves the validity and correctness of the method.
【作者单位】：西南科技大学环境与资源学院;四川理工学院;成都理工大学地球物理学院;
【基金】：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
【分类号】：P631.325

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