应用随裂缝倾角变化的孔隙模型改进储层饱和度计算

复杂的孔隙结构及多变的孔隙类型使得裂缝性储层成为测井评价的难点，通过假定不同孔隙类型间的导电方式来建立合理的孔隙模型，进而结合阿尔奇方程实现饱和度计算是目前裂缝性储层定量评价的主要方法和途径。在经典的双孔隙模型中求取岩石系统的总孔隙指数m时，未考虑裂缝与电流线的夹角变化带来的影响。通过在裂缝性储层中同时考虑裂缝曲折度、裂缝与电流线夹角双重因素，构建了改进双重孔隙模型，并结合电成像资料提供的倾角信息进行了实例处理。结果表明，改进模型的计算值与取心分析有着更好的一致性;若不考虑裂缝与电流线夹角等因素，将带来321%的相对误差。

Improve the Saturation Calculation Using Porosity Model Varied with Fracture Dip in Fractured Reservoir

 It is difficult to realize quantitative evaluation in fractured reservoir because of its complex pore structure and types. By assuming the conductivity way between different pore types, the method of establish a reasonable porosity model, and further combine with Archie equation to calculate water saturation is a conventional way. In the previous dual-porosity model, the effect of fracture dip and fracture tortuosity was not considered. The authors provide an improved porosity model varied with fracture dip and fracture tortuosity to reprocess the exponent index m and water saturation in fractured reservoir. By contrast with the core analysis data, the improved porosity model is more reasonable, and it maybe leads to a relative error of  32.1% while using the previous porosity model.