深层高压低渗砂岩储层微观孔喉特征参数研究

Feature parameters of micro pore throat in deep section high pressure and low-permeability sandstone reservoir

为研究深层高压低渗砂岩储层微观孔隙结构特征参数,应用常规压汞技术对东濮凹陷文东油田深层高压低渗砂岩储层样品进行分析测试.定义退汞饱和度参数(SE),提出以退汞效率(EW)与退汞饱和度(SE)的乘积作为储层微观孔隙结构分类评价指标(E).研究结果表明:储层孔隙、喉道类型多样,储层微观孔隙结构非均质性强;储层物性与孔喉分选系数呈正相关关系,这与常规中、高渗储层相反,与常规低渗、特低渗储层一致;储层物性与SE,EW的相关性差,这一点与常规储层不同;文东油田深层高压低渗砂岩储层微观孔隙结构可分为3类,Ⅰ类储层E大于11.21,Ⅱ类储层E在2.90～11.21之间,Ⅲ类储层E小于2.90.从微观孔隙结构特征参数角度来看,深层高压低渗砂岩储层既不同于常规中、高渗储层,又不同于常规低渗储层,属于非常规储层范畴.影响开发效果的主要因素是储层非均质性.

The feature parameters of micro-pore structure in deep section high pressure and lowpermeability sandstone reservoir of Wendong oil field in Dongpu sag were analyzed with the technology of conventional mercury penetration. The ejection saturation （SE） parameter was defined, and the product of ejection efficiency （Ew） and ejection saturation （St） was put forward as the classified appraisal index （E） of the micro-pore structures. The result shows that the types of pores and throats are various, and the heterogeneity of micro-pore structure is intense. There are direct correlations between the physical properties of reservoir and the sorting coefficient of pore throat, that is reverse to the pore throat of the conventional middle-high permeability sandstone reservoirrs and similar to the pore throat of the conventional super-low one. The correlation between the SE/Ew and the physical parameters is low, which differs from the conventional sandstone reservoirrs. The micro-pore structure in deep section high pressure and low-permeability sandstone reservoir of Wendong oil field was classified into three types. The parameter classified assessment indexes （E） of Ⅰ , Ⅱ and Ⅲ were above 11.21, from 2.90 to 11.21 and below 2.90, respectively. From the viewpoint of the feature parameters of micropore structure, the deep section high pressure and low-permeability sandstone reservoirs differsfrom the conventional conventional reservoir. ne^ty. middle-high permeability one, and so does the low one, it belongs to un The main factor that affects the development is the reservoir heteroge