子北油田毛家河区长6储层特征与物性影响因素

Characteristics of Chang 6 formation reservoir of Maojiahe in Zibei Oilfield

通过铸体薄片、压汞、扫描电镜等多项测试方法,对鄂尔多斯盆地子北油田毛家河区长6储层的岩石学特征、孔隙结构、成岩作用、储集类型进行了分析与研究.结果表明:研究区长6储层岩性主要为细粒长石砂岩,储集空间以残余粒间孔及各类溶蚀孔为主,孔隙结构以中孔微细喉型、小孔微细喉型为主.研究区长6储层物性受沉积微相、孔隙结构、成岩作用的共同影响,不同沉积微相储层的物性差异较大,孔隙结构的各项参数与渗透率间具一定的相关性,机械压实与胶结作用是主要的破坏性成岩作用,溶解作用是主要的建设性成岩作用.

The petrologic characteristics and pore types in Chang6 reservoir of the Zibei Oilfield in Ordos Basin were studied with varied methods, including casting sections, mercury injection experiment, SEM and experimental method. The results showed that the lithology is of mainly fine lithic sandstone, the dominating pore type of Chang 6 reservoirs is residual inter granular pore and dissolved pore, and midpore-microhetero is the main pore configuration. The main factors contributing to the physical properties are deposition properties, and accumulation properties are various in the different sedimentary micro-facieses, with a certain correlation between the parameters of the pore structure and permeability. Mechanical compaction and cementation are the main destructive factors and dissolution is the main constructive digenesis proving the properties by producing secondary porosities.