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孔隙结构是影响储层孔隙度、渗透率的重要因素,无论是在油气二次运移过程中油气驱替孔隙中的地层水时,还是油气在开发过程中从孔隙中被驱替出来时,都受孔隙结构所控制。采用薄片鉴定、压汞分析、扫描电镜等实验测试技术,对克拉玛依油田八区佳木河组储层微观孔隙结构特征进行了详细研究。研究结果表明,八区佳木河上亚组储层物性整体上属于中孔低渗~特低渗储层,孔隙以原生晶间孔、粒内溶孔、胶结物内溶孔为主,属于中小孔、微细喉道类型,喉道分选性差,均质性相对较差,连通性一般。通过对各类孔隙结构特征参数的相关性分析,选取有效孔隙度与渗透率作为孔隙结构主分类参数,对八区佳木河上亚组储层孔隙结构进行分类,共分为三大类、五个亚类。其中,I-1亚类储层孔隙结构最优,II类储层孔隙结构中等偏下和III类储层孔隙结构极差。
Pore structure is an important factor affecting the porosity and permeability of reservoirs. Whether oil and gas displace formation water in pores during the secondary migration of oil and gas or when oil and gas are driven out of pores during development, Are controlled by the pore structure. The microscopic pore structure characteristics of the reservoir in the Jiamuhe Formation in the eight districts of Karamay Oilfield were studied in detail by means of the laboratory tests such as flake identification, mercury intrusion analysis and scanning electron microscopy. The results show that the reservoir physical properties of the Upper Jiamuhe Formation in the eight districts are, as a whole, mesoporous low permeability and ultra low permeability reservoirs. The pores are dominated by intergranular intergranular pores, intragranular dissolved pores and dissolved pores in the cemented material, Small holes, fine throat types, poor throat separation, poor homogeneity, and general connectivity. According to the correlation analysis of the characteristic parameters of various pore structures, the effective porosity and permeability are selected as the main classification parameters of the pore structure, and the pore structures of the Upper Jiamu Group in the eight districts are classified into three categories and five A subcategory. Among them, the pore structure of sub-type I-1 reservoirs is the best, and the pore structure of middle-type II reservoirs and the type III reservoirs are very poor.