套管井电阻率测井方法研究

分析了套管井电阻率测井的传输线方程模型和曲面积分方程模型的特点及局限性；给出了复杂地层模型下的曲面积分方程表达式，采用子区域法求其数值解。用该方法系统地考察了套管井电阻率测井响应、环境影响、仪器参数。最后给出了实际地层模型下计算出的测井曲线，得到了与三侧向测井、感应测井一致的效果。为套管井电阻率测井仪器参数设计提供了依据，也为套管井电阻率测井解释打下了基础。

On Methodology of Resistivity Logging Through Casing

Based on analyzing the characteristics and limination of transmission line model and curved surface integral model for resistivity logging through casing, the mathematical expression of the curved surface integral equation is derived for complex formation and its numerical solution is obtained by using subdomain method. The resistivity log response, environmental effect and its tool parameters are investigated systematically. The computed log for the simulated formation agrees with the actual lateral 3 and induction logs. This study provides the ground for the tool design and lays the foundation for the interpretation of resistivity log through metal casing.