正宁-宜君地区长8储层特征及物性影响因素

通过岩心观察、薄片鉴定、扫描电镜、图像粒度、图像孔隙及高压压汞等分析测试手段,研究了鄂尔多斯盆地南部正宁-宜君地区长8储层特征及物性影响因素。研究表明,长8储层岩石类型主要是细-极细粒长石岩屑砂岩和岩屑长石砂岩,以碳酸盐胶结物为主,孔隙类型主要是粒间孔和长石溶孔;长8储层属于浅水湖泊三角洲型致密油砂岩储层;长8储层物性受沉积、成岩和孔隙结构等方面因素影响,长石颗粒含量高、碳酸盐胶结物含量高及孔隙结构较差是造成研究区长8储层低渗的主要原因。

Chang-8 reservoir characteristics and influential factors of physical property in Zhengning-Yijun area

Through core observation,thin section identification,scanning electron microscope,image size,image analytical means such as pore and high pressure mercury,the research on Chang-8 reservoir characteristics and influential factors of physical property in Zhengning-Yijun area has been carried out.Studies have shown that the main types of Chang-8 reservoir are fine-very fine-grained feldspar lithic sandstone and lithic arkose,with carbonate cements as the center.The pore types are mainly intergranular pore and feldspar dissolved pore.Chang-8 reservoirs belong to shallow water lake delta type of tight sandstone oil reservoir.Affected by sedimentation,diagenesis and pore structure factors,Chang-8 reservoirs are believed to be of high content of feldspar particles,carbonate cement content and poor pore structure,which are the main causes of low permeability reservoirs.The influential factors analysis of physical property can provide strong support for Chang-8 reservoir densification studies.