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为了准确评价岩相控制下复杂碳酸盐岩储层的饱和度,分析了J函数和Archie公式计算饱和度的原理,认识到毛管压力曲线的准确分类、胶结指数的精确计算分别是利用J函数和Archie公式去准确评价饱和度的核心问题.对于J函数,基于毛管压力曲线类型。分类建立J函数与饱和度之间的关系是不可取的;而应针对J函数的曲线类型,分类建立J函数与饱和度之间的关系;另外,可以对J函数的形式进行适当地改进,达到准确分类的目的.在分类建立饱和度评价模型之后,可以引入完备空间中对多参数进行分类的模型——决策树,来建立不同类型储层的分类模型.对于Archie公式,将多个参数的变化反映到一个参数上——视胶结指数,综合测井数据和储层参数,建立视胶结指数的计算公式,再利用Archie公式准确计算复杂碳酸盐岩储层的饱和度.J函数的改进思路、决策树分类模型的引入和视胶结指数的提出,为在特殊测井资料缺乏的情况下,利用常规测井资料和有限的岩心分析数据,准确评价岩相控制下复杂碳酸盐岩储层的饱和度奠定了一定的理论和实践基础.
In order to accurately evaluate the saturation of complex carbonate reservoirs controlled by lithofacies, the principle of calculating saturation by J-function and Archie’s formula is analyzed. It is recognized that the accurate classification of capillary pressure curve and the accurate calculation of cementing index are respectively calculated by J-function And Archie’s formula to accurately assess the core issue of saturation.For the J function, based on the capillary pressure curve type. It is not advisable to classify the relationship between J function and saturation. Instead, the relationship between J function and saturation should be classified according to the curve type of J function. In addition, the form of J function can be properly improved, To achieve the purpose of accurate classification.After the classification establishment of the saturation evaluation model, we can introduce the model of multi-parameter classification in the complete space - the decision tree to establish different types of reservoir classification model.For the Archie formula, a number of parameters Changes are reflected in a parameter - based on the cement index, well log data and reservoir parameters, the formula for calculating the cement index is established, and Archie’s formula is used to accurately calculate the saturation of complex carbonate reservoirs. Improved thinking, the introduction of decision tree classification model and the cement index, in order to make use of conventional well logging data and limited core analysis data in the absence of special logging data to accurately evaluate the characteristics of complex carbonate rocks The saturation of reservoir has laid a certain theoretical and practical foundation.