鄂尔多斯盆地陇东地区长7致密油藏储层特征

Features of Chang 7 Tight Oil Reservoir in Longdong Area of Erdos Basin

利用铸体薄片、扫描电镜和恒速压汞等先进的技术和方法,研究了陇东地区长7致密储层的物性特征,岩石学特征、结构特征和孔喉特征。结果表明,陇东地区长7储层属于特低孔超低渗透储层,岩石主要是岩屑砂岩,并且填隙物含量高,其中水云母对喉道的切割作用是研究区成为致密油藏的重要原因;孔隙类型以微孔为主,喉道细微,储层物性主要由喉道来决定。

Based on advanced technology such as casting thin section, SEM and constant-speed mercury injection experiment, characteristics of physical property, lithology, structure and pore and throat are studied. It is showed that Chang 7 reservoir in Longdong area is characteristic of ultra-low porosity and permeability. And the rock is Lithic sandstone. It has more interstitial materials compared to other reservoirs, especially hydromica which do more harmful to pore and throat. In addition, micro-pore is the main type and throats are very slight too. Thus reservoir properties depend on throats.