深水油田开发中后期剩余可动储量的识别方法

The Method for the Identification of Remaining Movable Reserve in the Middle and Later Period of Development of Deepwater Oilfield

在深水油田开发的中后期需要弄清楚油藏的剩余油分布规律,尤其是剩余可动储量的分布情况。通过改进油藏机会指数方法,提出了一种基于油藏数值模拟的剩余可动储量识别方法。以可动油柱高度表征油藏可动储量分布,以储层品质因子表征剩余可动储量富集区储层物性特征,以压力因子表征现有井网注采效果。通过细化油藏岩石类型表征和MDT多层压力精细拟合,提高对剩余可动储量的识别精度。在尼日利亚A油田的应用结果表明,运用这种剩余可动储量识别方法,可以比较准确地获得油藏剩余可动储量的分布情况。

Due to high drilling and completion cost, complex sedimentaPy reservoir characteristics, and low well high yield development strategy, it is hard to predict physical properties and reservoir connectivity between wells for deepwater oilfields. There is big challenge in identification of the remaining reserves distribution in the middle and later stage of oilfield development, and whether the remaining reserves can be effectively utilized, which is signifi-cant for infill well implement. To solve this problem, based on the improvement of Reservoir Opportunity Index （ROD , a method to identify- the upswept oil zone considering the net oil column height, rock quality and pressure is proposed. The net oil column height index is used to characterize movable reserve distribution. The rock quality index is used to characterize physical properties of up - swept oil zone. The pressuure index is used to characterize the effect of water injection between wells. Meanwhile, two other methods such as rock type characterization and MDT history matching are also proposed, in order to recognize remaining movable reserves more accurately. The resuits show that the identification method of residual movable reserves can effectively guide infill well study and has certain guiding significance for recognizing un - swept oil zone during the later stage of oilfield development.