碳酸盐岩储层含水饱和度模型发展及分析

Improvement and Analysis of Carbonate Reservoir Saturation Model

在参阅国内外相关文献基础上,根据研究对象、导电方式、研究方法的不同,将目前针对碳酸盐岩储层的含水饱和度模型分为4种:基于阿尔奇方程的经验性扩展模型;按照不同孔隙发育类型划分、基于双重及三重孔隙的饱和度模型;按照孔隙尺寸大小划分、基于双重及三重孔隙的饱和度模型;基于有效介质理论基础的饱和度模型。从导电机理、基本假设、应用情况对不同的饱和度模型进行了分析,指出基于阿尔奇方程的经验性扩展模型形式简洁,在实验数据刻度下往往可以达到数值上的等效,而基于三重孔隙的饱和度模型是目前最有希望达到通用性应用的一种。对于碳酸盐岩饱和度模型的研究,建议今后从导电机理,岩石物理实验、模型参数求取及应用等方面做更深入的工作,并指出基于数字岩芯的孔隙网络导电模型是今后发展的重要方向。

In order to understand the current situation of carbonate reservoir water saturation models, and to offer basic infor- mation for saturation evaluation in heterogeneous reservoir, this paper summarizes the current saturation interpretation models. According to study objects, conductive mechanism and study methods, the carbonate reservoir saturation interpretation models are divided into four types ： Archie and its extended empirical saturation models, saturation models of dual and triple porosity system based on different porosity types, saturation models of dual and triple porosity system based on different porosity size, and saturation models based on effective medium theory. The conductive mechanism, assumption and application of different saturation interpr^tation models have been discussed. It points out that the Archie formula is concise, and always equivalent in the numerical sense after scaled by the data of experimental analysis and the triple-model will be the most conventional one that we expected currently, and based on the discussion we suggests that rock conductive mechanism, petrophysics experiment and the calculation of model parameters need further research, and that the pore network model based on digital core is an important research subject in carbonate reservoir evaluation.