为了提高测井解释精度,提升解释模型区带适用性,以苏北盆地溱潼凹陷西斜坡阜三段储层为对象,开展了区带孔隙度、饱和度评价模型研究。对实验分析孔隙度和测井资料进行统计分析发现,经泥质校正后的声波时差曲线与实验分析孔隙度较好地满足声波地层因素关系,确定本区岩石骨架声波时差为189.39 μs/m,骨架岩性系数x为1.472,建立了区带孔隙度解释模型;分析了地层因素F与孔隙度的关系,明确了胶结指数m随岩心孔隙度的变化规律,即中孔储层随着孔隙度增大,m值较为稳定,高-特高孔储层随着孔隙度增大,m值有增大趋势;实现了由测井资料计算可变胶结指数m,进而可准确计算储层含油饱和度。应用结果表明,利用建立的孔隙度和饱和度模型在本区的解释成果与实验分析吻合性好。

In order to improve the accuracy of log interpretation and the applicability of interpretation model for zones, the suitable porosity and saturation models are established for analysis of the 3rd member of Funing Formation in the west slope of Qintong sag, North Jiangsu basin. After the statistics and analysis of the experimental porosity and well logs, it is found that interval transit time after shale correction and the porosity of the experimental analysis can satisfy the relation among acoustic formation factors. The interval transit time for the rock matrix in this area is determined to be 189.39 μs/m, the matrix lithology coefficient（x） is 1.472, and the interpretation model for the porosity in the zone is established. And then, the relation between formation factor（F） and porosity is analyzed. Meanwhile, the variation rule of cementation index（m） with core porosity is determined, that is, with the increase of porosity in mesoporous reservoirs, m is relatively stable, while with the increase of porosity in high-extra-high pore reservoirs, m tends to increase. Therefore, the variable cementation index（m） can be calculated from well logs, and then the oil saturation of reservoir can be calculated accurately. The interpretation results of the established porosity and saturation models in this area agree well with the experimental analysis.