聚驱后油田剩余油潜力分布规律研究

综合考虑剩余油饱和度、厚度、渗透率、孔隙度、相带、原始含油饱和度、注水井距离等7个因素,利用模糊综合评价方法,以大庆油田北一二排西块为例,计算了该区块8个沉积聚驱后剩余油潜力,并分析聚驱后剩余油潜力分布特征.结果表明,聚驱后仍有比较大的剩余油潜力;聚驱后剩余油潜力主要集中在高渗透、厚度较大、剩余油饱和度较高、河道砂等高级别沉积相带的区域;聚驱后在潜力值为0～0.2区间内的剩余油储量很小,潜力值为0.4～0.6区间内的剩余油储量最大,而潜力值为0.6～0.8区间内剩余油储量次之.

Investigation on the Distribution Rule of Potential of Remaining Oil after Polymer Flooding

Using fuzzy mathematical method,the remaining oil distribution after polymer flooding was investigated for the 8 sedimentary units of Beiyierpaixi area of Daqing Oilfield, with 7 influential factors being considered in the mathematical model.They are remaining oil saturation,thickness,permeability,porosity,sedimentary facies,original oil saturation and distance away from injection well.The distribution rule of the potential of remaining oil was analyzed.The results show that there is still a great potential in reservoir after polymer flooding.The potential is mainly distributed in area with high permeability,large thickness, high remaining oil saturation and good sedimentary facies such as river channel.After polymer flooding,regions the values of remaining potential of which are in the range of 0-0.2 have very little remaining oil reserves,regions the values of remaining potential of which are in the range of 0.4-0.6 have the largest remaining oil reserves,and regions the values of remaining potential of which are in the range of 0.6-0.8 have intermediate remaining oil reserves.