大牛地气田山西组山1段储层孔隙结构特征

Pore structure features of the first member reservoir of Shanxi Formation
in Daniudi Gas Field

刘忠群 胡杨

华北分公司勘探开发研究院，河南 郑州 450006

Research Institute of Exploration and development, North China Company, SINOPEC, Zhengzhou 450006, China

根据薄片分析、孔渗分析及压汞实验分析成果，对大牛地气田下石盒子组山1段储层孔隙结构特征进行研究，结果表明：山1段储层具有较高的排驱压力和中值压力、较小的孔隙喉道半径，孔隙结构较差造成山1段储层具有低孔隙度、低渗透率特征。利用孔隙度、渗透率、排驱压力和孔隙喉道半径等4个参数对储层进行了分类，共分出Ⅰ、Ⅱ、Ⅲ、Ⅳ类储层，其中Ⅰ类为本区好储层，Ⅱ类为中等储层，Ⅲ类为差储层，Ⅳ类为非储层，气田主要发育Ⅱ—Ⅲ类储层。

The research on the pore structure feature of the first member reservoir of Shanxi Formation in Daniudi Gas Field is based on the analysis result of conventional thin section,porosity,permeability and mercury injection test. The research shows that the first member reservoir of Shanxi Formation has the characteristics as high displacement pressures,high median pressures and small pore throat radius. A bad pore structure is the main factor of causing the reservoir to have the characteristics of low porosity and low permeability. In light of four parameters as porosity,permeability,displacement pressure and pore throat radius,the reservoirs are
classified as TypeⅠ_’Ⅱ_’Ⅲand Ⅳ,in which the TypeⅠis the best reservoir in this area,the Type Ⅱis the normal reservoir,the Type Ⅲis the bad reservoir and the Type Ⅳis not reservoir. TypeⅡto Ⅲreservoirs are the main reservoirs in Gas field.