坑(井)—地电阻率成像技术数据处理方法研究

Research of data processing for hole(well) -ground resistivity imaging technology

开发坑(井)一地电阻率成像技术数据处理软件包,对分布式地面一坑道电磁信号接收仪记录的时间序列进行分析处理,最终得到相应的视电阻率和相位参数。实际资料处理结果表明,在远区情况下,需考虑信噪比水平,选择合适的计算方法。当信噪比很低或较高时,可选择根据卡尼亚电阻率定义式直接比值的方法,该方法计算简便、效率高;当信噪比一般时,采用最小二乘或Robust等估算方法,能在一定程度上改善数据处理质量。

This study aims to research and develop a data processing software package for the hole （well） - ground resistivity imaging technology. And the main objective of the software pack- age is to do data analysis and processing for the time series received by distributed hole- ground electric and magnetic receivers, and finally to get the parameters like apparent resistivity and impedance phase. The processing results from field data showed that it was necessary to consider signal to noise ratio to choose appropriate methods in the far zone. We suggested to choose the way to get apparent resistivity and impedance phase which calculated from ratio that was according to the definition of Cagniard resistivity because of its convenience and high efficiency while the signal to noise ratio was whether very low or high. However using estimation methods like least square （LS） or Robust would get better results while the signal to noise ratio was moderate.