多级可拓评价法在储注气油藏筛选中的应用

Application of the multi-level extension evaluation method in the selection of oil reservoirs for gas storage and gas injection

筛选出既符合改建地下储气库、又能够满足注气驱技术条件的储注气油藏,是油藏筛选评价技术的一个新课题。为此,通过综合分析国内外地下储气库的建造标准与注气驱油藏开发的基本条件,构建了储注气油藏筛选的多级指标体系,提出了应用物元理论对储注气油藏特征指标进行多级可拓评价的方法:基于可拓学的物元理论建立储注气油藏多级物元模型,引入可拓集合中的关联函数与关联度,由综合关联度的大小对多个油藏进行定量评价。实例应用表明:该方法对某油田多个储注气油藏的筛选评价具有较好的适应性,可以避免传统方法的评价失效与偏差,能满足储气、注气的双重要求。

To select oil reservoir for gas storage and gas injection which can not only be built as gas storage but meet the technical condition for gas injection displacement is a new task for oil reservoir selection and evaluation technology.This paper hereby establishes a multi-level index system for the selection of oil reservoirs for gas storage and gas injection and puts forward a multi-level extension evaluation method for the characteristics indicators of such reservoirs by means of the matter-element theory.The multi-level matter-element model is built in accordance with the Extenics-based matter-element theory,the correlation function in the extension set and the correlation degree are introduced,and the quantitative evaluation is performed on several oil reservoirs by correlation degree.The application shows that the method is of favorable adaptability to the selection of multiple oil reservoirs for gas storage and gas injection of a certain oil field,avoiding failures and errors made by the conventional methods,so it is capable of meeting the demand of gas storage and gas injection.