夹层对油藏的控制作用分析——以准噶尔盆地中部1区块莫西庄地区三工河组为例

A nalysis of controlling function of interlayer on the oil reservoir-taking Sangonghe formation of Moxizhuang are-a, Block No. 1, middle part of Junggar Basin as an example

针对准噶尔盆地中部1区块莫西庄地区三工河组厚层砂体内部油水分布关系复杂、油藏圈闭类型难以识别等问题,从非均质性研究入手,描述了主力夹层的分布特征,计算了夹层的排替压力,利用夹层与储层的排替压力差分析了夹层对油气的封堵能力,揭示了夹层对油气水分布的控制作用。夹层造成了纵向上油水关系的不同,使部分井区形成了“上水下油”的油水分布状况;具有一定封堵能力的非均质性夹层在侧向上造成了厚层砂体内油水界面的不同;夹层还能够降低底水油藏的含水上升速度。

In face of the complicated oil-water distribution in the thick sandbody and the identification difficulty of the type of the reservoir traps in this area,the distribution character of main interlayer was described, and the replacement pressure of interlayer was calculated beginning with the study of heterogeneity. Displacement pressure difference between the interlayer and reservoir was applied in analyzing the shut - off capacity of interlayer to oil and gas, and the controlling function of interlayer on the distribution of oil, gas and water in reservoir was discovered. The interlayer made the different relation of oil andwater in vertical, which led to the situation of water - upper and oil - down. The heterogeneous interlayer having some shut- off capability also made the different oil - water interface in thick layer in the lateral. The interlayer can also reduce the ascending speed of the water cut in the bottom -water reservoir.