基于可控源音频大地电磁法的场源影响校正新方法  

A New Method of Field Source Influence Correction Based on Controlled-source Audio Magnetotelluric Method

作　　者：肖鹏飞[1] 齐文杰 高永才 徐凤娇 李弘[1] 俞建宝[1] XIAO Peng-fei;QI Wen-jie;GAO Yong-cai;XU Feng-jiao;LI Hong;YU Jian-bao(Research Institute of Petroleum Geophysical Prospecting Technology,China Petroleum&Chemical Corporation,Nanjing 211103,China;School of Geophysics,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]中国石油化工股份有限公司石油物探技术研究院,南京211103 [2]成都理工大学地球物理学院,成都610059

出　　处：《科学技术与工程》2022年第21期9034-9043,共10页Science Technology and Engineering

基　　金：国家重点研发计划(2019YFC0604902)。

摘　　要：基于一维正演模拟,对可控源音频大地电磁法(controlled-source audio magnetotelluric method, CSAMT)实测资料处理的场源影响校正问题进行了研究。通过计算远场因子与发射频率、收发距和大地电磁阻抗倒数模三者乘积(综合因数)的关系,实现了简洁有效的查表场源影响校正方法。同时,为提高校正方法解决实际生产问题的能力,又开展了视电阻率数据场源影响校正与反演处理协同联进策略(反演递归校正法)的研究工作,从而进一步提高了数据处理效果;考虑到反演递归校正处理方法,受初步校正结果影响较大,又提出了设计层状背景模型的校正方案,即在工作区前期地质与物性等资料综合研究成果的基础上,通过对工区地质-地电模型的构建,进一步提高CSAMT实测资料的场源影响校正效果,并经由理论模型算例和实测数据处理验证了方法的可行性和有效性。Based on the one-dimensional forward modelling,the field source influence correction problem of the controlled-source audio magnetotelluric method(CSAMT)measured data processing was studied.By calculating the relationship between the far-field factor and the product(comprehensive factor)of the transmitting frequency,the transmitting and receiving distance and the magnetotelluric impedance inverse modulus,a simple and effective method for correcting the influence of the field source in the look-up table was realized.At the same time,in order to improve the ability of the correction method to solve actual production problems,the research work on the coordinated joint strategy of the apparent resistivity data field source influence correction and the inversion processing was carried out,that is the inversion recursive correction method.Therefore the data processing effect was further improved.Considering the inversion recursive correction processing method,which is greatly affected by the preliminary correction results,a correction scheme for designing layered background model,which is based on the comprehensive research results of geological and physical data in the early period of the working area was also presented.Through the construction of the geological-geoelectric model of the work area,the field source influence correction effect of the CSAMT measured data was further improved,and the feasibility and effectiveness of the method were verified by examples of theoretical model and measured data processing.

关 键 词：可控源音频大地电磁法 场源影响校正 远场因子 综合因数 反演递归 设计层状背景模型 

分 类 号：P631[天文地球—地质矿产勘探]