泌阳凹陷梨树凹地区储层特征及成因分析

通过梨树凹地区的岩心观察、扫描电镜、薄片鉴定、物性、压汞等资料分析,对该区储层物性、孔隙结构特征等进行了系统研究。该区储层砂岩的主要类型为岩屑长石砂岩,岩性复杂,从岩性较粗的含砾粗砂岩、粗砂岩到岩性较细的细粉砂岩都具有含油性。储层孔隙类型以原生粒间孔为主,有少量粒内溶孔发育,孔喉分选不均匀,分选中等-差,孔喉比大,配位数偏低,孔喉连通性差。该区储层孔隙度中等,渗透率纵向差异较大,总体上属中孔、中-低渗透储层,主要取决于物源远近及所处的沉积相带,储层物性平面及纵向非均质性较强。

Reservoir characteristics and genesis analysis of Lishuao area in Biyang sag

Through core observation,scanning electron microscopy(SEM),thin section identification,physical property,mercury injection data analysis of Lishuao area,the systematic research on reservoir physical properties and pore structure characteristics has been carried out.The main types ofthe reservoir sandstone in the area are of lithic arkose,rich feldspathic lithic sandstone,presenting complex lithology.From the lithology of coarser grit gravel,coarse sand to finer powder sandstone,all of oil-bearing characteristics.Reservoir pore type is given priority to primary intergranular pore,with a small grain of solution pores development,uneven pore throat sorting and separation of medium-poor,big pore throat ratio,low coordination number and poor pore connectivity.The medium reservoir porosity and permeability of the longitudinal difference is bigger,generally belonging to medium porosity,medium-low permeability reservoir,which mainly depends on the content source distance and of sedimentary facie,with stronger reservoir property in plane and vertical heterogeneity.