套管井井间电阻率测井的原理及数值计算

Theory and Numerical Calculation of the Cross-Well Formation Resistivity Logging Through Casing

本文以电磁场理论为基础 ,导出了过套管进行井间地层电阻率测井问题的理论公式 ,并用低频电磁波进行了数值计算 ,分析了套管对井间电阻率测井的影响。结果表明 :用低频电磁波过套管测量地层电阻率的井间测井方法是可行的。该理论可为套管井井间地层电阻率测井仪器的研制、测井解释及井间电阻率层析成像技术提供重要的理论依据。

Based on the electromagnetic field theory, this paper derives the theoretical formulae for the cross-well formation resistivity logging through casing, conducts numerical calculation, and analyzes the influence of casing on the cross-well resistivity logging. The result shows that the new method using low frequency electromagnetic wave to measure the formation resistivity through casing is effective. The theory can provide a theoretical foundation for the development of logging tools, for the interpretation of casedhole logging and for the technique of cross-well formation resistivity tomography through casing.