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电性各向异性低电阻率储层的含水饱和度评价经常出现偏差,其原因在于对这种储层的评价没有综合考虑测井仪器的测量特性和地层电阻率方向上的差异。对垂直井,表征各向异性地层的参数主要有水平电阻率和垂直电阻率,但常规电法测井只提供地层水平方向的电阻率信息,不能直接测量地层垂直方向的电阻率。多分量感应测井直接用来测量电性各向异性地层的水平电阻率和垂直电阻率,从而可对各向异性储层进行较为客观的评价。简单介绍了多分量感应测井原理,推导了垂直井中进行三维有限差分模拟的计算公式。计算结果表明,该算法能较好地模拟三维地层模型。它对更深入研究多分量感应测井方法以及进行仪器研制打下了较好的基础。
The evaluation of water saturation in electrically anisotropic low resistivity reservoirs is often biased due to the fact that the evaluation of such reservoirs does not take into account differences in the measuring characteristics of the logging tool and in the direction of the formation resistivity. For vertical wells, the parameters that characterize anisotropic formations are mainly horizontal resistivity and vertical resistivity. However, the conventional electrical logging only provides resistivity information in the horizontal direction and can not directly measure the resistivity in the vertical direction. Multi-component induction logging is used to directly measure the horizontal resistivity and vertical resistivity of anisotropic reservoirs, so that the anisotropic reservoirs can be objectively evaluated. The principle of multi-component induction logging is introduced briefly, and the formula of three-dimensional finite difference simulation in vertical wells is deduced. The calculation results show that the algorithm can simulate the 3D stratum well. It lays a good foundation for further research on multi-component induction logging method and instrument development.