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韵律层内的剩余油已成为油田开发后期调整挖潜的主要目标,根据精细数值模拟研究结果认识层内剩余油的分布规律,可以指导高含水油田后期的开发调整。以胜坨油田胜二区8砂组的地质条件为基础建立概念模型,采用油藏数值模拟方法,分析了同一个韵律层内剩余油的分布规律。研究结果表明:水驱计算至高含水期后,在同一个韵律层内,垂向上上部小层剩余油饱和度高,下部小层剩余油饱和度低,接近于残余油饱和度;小层厚度越小,油、水的地下密度差越大,原油黏度越小,这种现象越明显;而注水井射孔位置对韵律层内垂向上剩余油的分布基本没有影响。因此,对已进入高含水开发阶段的胜坨油田,后期调整挖潜的目标是韵律层内的上部层段。
The remaining oil in the rhythm layer has become the main target for the adjustment and tapping potential in the late development of the oilfield. According to the results of the numerical simulation, the distribution of remaining oil in the layer can guide the development and adjustment of the high-water-cut oilfield in the later period. Based on the geological conditions of Block 8 sandstone in Sheng’er District of Shengtuo Oilfield, a conceptual model was established and the distribution law of remaining oil in the same rhythm layer was analyzed by reservoir numerical simulation. The results show that the residual oil saturation in the vertical upper part is high and the residual oil saturation in the lower part is low, which is close to the residual oil saturation in the same rhythm layer after the waterflooding calculation to the high water cut period. Small, oil, water, the greater the difference between the underground density, the smaller the viscosity of crude oil, the more obvious this phenomenon; and injection well perforation location on the vertical distribution of residual oil basically no effect. Therefore, for the Shengtuo Oilfield that has entered the high water-cut development stage, the target of subsequent adjustment and tapping potential is the upper section within the prosodic layer.