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通过岩心观察、薄片鉴定、扫描电镜、以及高压压汞等测试手段,重点对鄂尔多斯盆地义正地区长6油层组孔隙类型和储层特征经行研究。研究结果表明,该地区长6油层组主要发育浅水湖泊三角洲型致密油砂岩储层。义正地区长6油层组主要发育长石砂岩,残余粒间孔和长石溶孔最发育,多种复杂的成岩作用导致储层渗透率降低并致密化。研究区储层具有5类孔隙结构类型,其中中孔细喉型和小孔—微孔隙细喉型为主要类型。
Through the core observation, thin slice identification, scanning electron microscopy and high pressure mercury intrusion test, the paper focuses on the pore type and reservoir characteristics of Chang 6 reservoir in Yizheng area, Ordos Basin. The results show that the Chang 6 reservoir in this area mainly develops deltaic tight oil sandstone reservoirs in shallow lakes. The Chang 6 oil layer in the Yizheng area mainly grows feldspathic sandstone with the most developed residual intergranular pores and feldspar dissolved pores. Various complicated diagenesis causes the reservoir permeability to decrease and densify. There are five types of pore structure in the study area, of which the mesopore thin throat type and the small pore-micropore throat type are the main types.