中高渗油藏二元复合驱后剩余油分布特征——以胜利孤东油田七区西5~4-6~1单元为例

Residual Oil Distribution of Med-high Permeability Reservoirs After Binary Compound Flooding

胜利油田中高渗油藏二元复合驱后,储层内仍有大量剩余油,但剩余油分布规律以及其与水驱、聚合物驱的区别有待研究。以孤东油田七区西Ng54-61单元为研究对象,利用密闭取心、测井及矿场监测资料,认识到剩余油分布特征为平面非主流线富集、层内多段见水且剩余油饱和度上下差异较小、主力小层与非主力小层之间的剩余油饱和度差异仍然明显;剩余油分布影响因素为平面主要受注采井距和排距控制,层内受韵律性、渗透率级差以及储层有效厚度影响,层间差异主要受主力小层和非主力小层的渗透率级差影响,为二元驱后油藏调整提供了依据。

Med-high permeability reservoirs of Shengli oilfield still have a lot of residual oil after binary compound flooding, but the distribution of residual oil need be further studied. In this paper, taking Xi Ng54-61 unit in No.7 block of Gudong oi}field as the research object, the distribution characteristics of residual oil after binary compound flooding were analyzed based on coring, logging and supervising data. The results show that the distribution characteristics of residual oil are plane non-mainstream line enrichment, the remaining oil saturation difference between up and bottom inner layers is small, the remaining oil saturation difference between active layer and non-active layer is obvious; the distribution of residual oil after binary compound flooding is affected by injection-production distance and well space on the plane, and by rhythmicity, permeability ratio and effective thickness in the layer; interlayer difference is affected by the permeability ratio of active layer and non-active layer.