泥浆侵入电阻率各向异性对多分量感应测井影响分析

泥浆侵入常常会加剧井周围地层电阻率的各向异性。多分量感应测井可用于测量地层各向异性电阻率。从基本的电磁场规律出发,导出电阻率各向异性地层中的电磁场方程,利用三维数值模拟方法,模拟了多分量感应测井的视电导率响应,研究了多分量感应测井仪器在各向异性地层中的测井响应特性,考察了各向异性地层中侵入带电阻率各向异性对其测井响应的影响。研究结果可为多分量感应测井正反演以及更好地应用于油水层识别中消除泥浆侵入的影响提供一定的理论参考。

The Effect of Resistivity Anisotropy of Mud-invaded Zone on Multi-component Induction Logging

Mud invasion often induced anisotropy around wellbore.Multi-component induction logging could be used to detect anisotropic resistivity in formation.Mud invasion is one of the important influential factors of resistivity logging.The electromagnetic field equation in anisotropic formation was obtained in combination with basic electromagnetic field theory.The apparent resistivity response of multi-component induction logging was simulated by 3D numerical method,and the characters of multi-component induction logging tool in the anisotropic formation were studied,the influence of invaded resistivity anisotropy on logging response was investigated.The result provides theoretical reference for correcting the effect of complex mud invasion on the multi-component induction logging.