【摘要】 饱和度指数是计算含水饱和度的一个重要参数，其微小变化会导致含水饱和度的明显变化。储层润湿性会影响孔隙空间流体分布的几何形状和连通性，继而影响岩石电阻率测量值，最终反映在阿尔奇公式的饱和度指数n上。为了解方解石的含量和润湿性对饱和度指数的影响，实验选取X地区Y油层4口井42块岩样进行全岩分析和岩电实验。实验结果表明：方解石的润湿性和含量影响饱和度指数，饱和度指数随着方解石含量增大而增大；方解石是油湿的，油湿储层的饱和度指数比水湿储层的饱和度指数大；在方解石含量较高的储层中，计算含水饱和度应充分考虑方解石润湿性带来的影响。更多还原

【Abstract】 Saturation index is an important parameter for calculating water saturation. Its small change can lead to obvious change of water saturation. Reservoir wettability will affect the geometry and connectivity of fluid distribution in pore space, and then affect the measured value of rock resistivity. This effect will be reflected in the saturation index n of Archie formula. In order to understand the influence of calcite content and wettability on saturation index, 42 rock samples from 4 wells of Y oil layer in X area are selected for whole rock analysis and rock resistivity experiment. The experimental results show that the wettability and content of calcite affect the saturation index n, n increases with the increase of calcite content. Calcite is oil wet, the saturation index of oil wet reservoir is larger than that of water wet reservoir. In the reservoir with high calcite content, the influence of calcite wettability should be fully considered in calculating water saturation.更多还原