摘要
应用电磁场理论及传输线模型可建立CHFR测井响应方程,应用传输线模型可研究CHFR测井的测量原理及其影响因素.研究表明中场区电场电位二阶导数稳定,电位二阶导数对地层电阻率变化敏感,在套管外仅存在径向分量,该区延伸范围大,通过测量测点中场区的电位二阶导数和电位可实现过套管地层电阻率的测量.测量频率、电极距、水泥环、套管非均质性等因素都对测井响应产生影响.
The theoretical equations of Cased hole formation resistivity logging are set up according to electromagnetic theory and transmission-line model. The measure principle and influence factors are investigated using transmissionline model. It can be concluded that the middle field of electric field extends quit far into the stratum and the second order derivative of electric field in this area is steady and changes with formation resistivity acutely. The formation resistivity can be calculated by measuring the second order derivative of electric potential and the electric potential itself. From the research we can know that measure frequency and the space between electric coins and cement around the cased hole and so on all affects the response.
出处
《地球物理学进展》
CSCD
北大核心
2005年第3期780-785,共6页
Progress in Geophysics
基金
国家自然基金项目(40474020)资助
关键词
传输线模型
套管井
过套管电阻率
测井响应
Transmission-line model, cased hole, cased hole formation resistivity, logging response
