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孔隙结构是影响储层物性的重要因素。采用铸体薄片、扫描电镜、压汞分析等技术手段,对安塞油田H区长6油层组储层微观孔隙结构特征进行了深入的研究。结果表明,安塞油田H区长6储层属于低孔、特低渗储层,孔隙以溶蚀粒间孔、残余粒间孔和粒内溶孔为主,属中孔、微细喉道类型,孔喉分选性好,连通性一般。根据孔隙结构特征相关参数将毛管压力曲线分为4类,研究区主要以Ⅱ类和Ⅲ类为主。从Ⅰ类到Ⅳ类,排驱压力和中值压力逐渐增大,中值半径和平均喉道半径逐渐减小,反映出储层的孔隙结构和渗流能力由好变差。孔隙结构特征参数与物性的相关性研究表明,物性是排驱压力、中值压力、结构系数等多种因素综合作用的结果。
Pore structure is an important factor affecting reservoir physical properties. The microscopic pore structure of Chang 6 reservoir in H zone of Ansai Oilfield was studied by means of casting thin slices, scanning electron microscopy and mercury intrusion analysis. The results show that the Chang 6 reservoir in H zone of Ansai Oilfield belongs to low-porosity and ultra-low permeability reservoirs. The pores are dominated by intergranular pores, residual intergranular pores and intragranular dissolved pores, Pore and throat good sorting, connectivity in general. The capillary pressure curves are divided into four categories according to the relevant parameters of the pore structure characteristics. The study area mainly consists of type II and type III. From Ⅰ to Ⅳ, the displacement pressure and median pressure gradually increase, and the median radius and average throat radius decrease gradually, which shows that the pore structure and seepage ability of reservoirs are greatly deteriorated. The correlation between pore structure parameters and physical properties shows that physical properties are the result of a combination of many factors including displacement pressure, median pressure and structure coefficient.