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三轴张量感应测井可探测各向同性以及各向异性地层的电导率,本文主要讨论了三正交线圈下的均匀各向同性模型,并利用低频测量电流,近似于单极子源,推导了各向同性地层视电导率解析解的计算全过程。分析了均匀各向同性地层下的视电导率在不同频率下的响应函数,以及该模型下电导率的响应特性,并对三正交线圈系直耦信号与电导率曲线特性进行了深入的研究,分析了影响测量响应的主要因素,为三维感应仪器研制提供理论指导,具有一定的理论和实际意义。
Three-axis tensor-induced logging can detect the conductivity of isotropic and anisotropic formations. This paper mainly discusses the homogeneous isotropic model under tri-quadrature coil, and uses the low-frequency current to approximate the monopole source, The whole calculation process of apparent conductivity of isotropic stratum is deduced. The response function of apparent conductivity at different frequencies under uniform isotropic formation and the response characteristics of conductivity under the model are analyzed. The characteristics of the direct-coupled signal and the conductivity curve of the tri-orthogonal coil are studied in detail , Analyzes the main factors that affect the measurement response, provides theoretical guidance for the development of three-dimensional sensing instruments, has a certain theoretical and practical significance.