基于浅层直流电阻率模型的音频大地电磁静校正方法研究  

Research on Audio-frequency Magnetotelluric Static Correction Method Based on Shallow DC Resistivity Model

作　　者：陈清 张业 谢昭晖 Chen Qing;Zhang Ye;Xie Zhaohui(China Railway Fifth Survey and Design Institute Group Co.,Ltd,Beijing 102600,China)

机构地区：[1]中铁第五勘察设计院集团有限公司,北京102600

出　　处：《工程地球物理学报》2021年第5期589-596,共8页Chinese Journal of Engineering Geophysics

摘　　要：音频大地电磁法普遍受静态效应的影响,在定性解释时出现虚假的直立构造异常或者垂向延伸的异常体。为减少静态效应的不利影响,进而提高音频大地电磁数据质量和解释的准确性,本文提出了依据浅层直流电阻率模型进行校正的方法思路,通过直流电法模型进行音频大地电磁正演模拟,建立直流电法数据和音频大地电磁数据的关系,从而获得静态效应常量。通过设计理论模型试验和对实测数据进行校正,校正结果表明该方法为静态校正提供了量化依据,可将静态效应引起的视电阻率偏移降低到较低水平,为音频大地电磁静态校正提供了一个新的技术手段。The audio-magnetotelluric method tends to be affected by the static effect,and qualitatively interpreted as structural anomaly or the vertically extended anomaly body.In order to reduce the negative effects of static effects and improve the quality of audio magnetotelluric data and the interpretation accuracy,this paper proposes a correction method based on shallow DC resistivity model.Through the DC method model,the audio magnetotelluric forward simulation is carried out,the relationship between DC method data and audio magnetotelluric data is established,and then the static effect constant is obtained.By designing theoretical model tests and correcting the measured data,the correction results show that this method provides quantitative basis for static correction and can reduce the apparent resistivity shift caused by static effect to a lower level,which provides a new technique for audio magnetotelluric static correction.

关 键 词：直流电阻率模型 一维正演 静校正 音频大地电磁 

分 类 号：P631.3[天文地球—地质矿产勘探]