MATLAB在CSAMT数据全区视电阻率求取中的应用  

APPLICATION OF MATLAB IN CALCULATING THE ALL-TIME APPARENT RESISTIVITY OF CSAMT DATA

作　　者：李能勇 刘春超 LI Neng-yong;LIU Chun-chao(The First Institute of Hydrology and Engineering Geological Prospecting of Anhui Geological Prospecting Bureau,Bengbu 233000,China)

机构地区：[1]安徽省地勘局第一水文工程地质勘查院,蚌埠233000

出　　处：《地质灾害与环境保护》2024年第2期112-117,共6页Journal of Geological Hazards and Environment Preservation

摘　　要：CSAMT在其标量测量模式下,野外采集数据存在“近场效应”,数据产生畸变。为了快速、有效地对“过渡区”和“近区”数据进行校正,达到消除“近场效应”,增加勘探深度的目的,利用MATLAB作为编程计算工具,直接利用实测的卡尼亚视电阻率和对应的少量测量参数,从卡尼亚视电阻率公式出发,采取正演迭代方法求取全区视电阻率,并给出了计算程序代码。验算结果表明,该正演迭代计算方法求取全区视电阻率,实现“近场效应”校正效果显著,并且具有较高运算精度和速度,程序代码可直接作为处理CSAMT实测数据的工具。Under the scalar measurement mode of CSAMT, there is a “near-field effect” in the data collected in the field, which generates distortion in the data. In order to quickly and effectively correct the data in the “transition zone” and “near zone” to eliminate the “near-field effect” and increase the exploration depth, MATLAB is used as the programming and calculation tool, the measured Cagniard apparent resistivity and the corresponding small amount of measurement parameters are directly utilized, and starting from the Cagniard apparent resistivity formula, an orthogonal iterative method is adopted to obtain the apparent resistivity of the whole area, and the calculation program code is given. The results show that the forward iterative calculation method is effective in obtaining the all-time apparent resistivity and realizing the “near-field effect” correction, and has high accuracy and speed, and the program code can be used directly as a tool for processing the CSAMT measured data.

关 键 词：CSAMT MATLAB 全区视电阻率 卡尼亚电阻率 

分 类 号：P631[天文地球—地质矿产勘探]