砾岩油藏聚驱后剩余油潜力评价

Evaluation on Remaining Oil Potential After Polymer Flooding at Conglomerate Reservoir

针对七东1区克下组砾岩油藏冲积扇储层宏观非均质性强、微观孔隙结构复杂的特征,综合多维度动态静态测试资料,对七东1区聚驱试验区剩余油进行了研究。研究结果表明,聚驱后8.8%的未波及储量难以动用;13.6%的弱波及储量可以通过提高驱油效率动用;35.7%的储量可以通过扩大波及体积动用;41.9%的储量只能通过高浓度段塞调剖封堵,先扩大波及体积,再提高驱油效率动用。

In view of the significant macroscopic heterogeneity and complex micropore structure of the conglomerate reservoir fluvial fan reservoir bed at Kexia Group of No.1 Qidong Block,the research on the remaining oil from the polymer flooding testing area of No.1 Qidong Block was carried out while taking the comprehensive multi-dimensional dynamic and static testing data into account.The results of research have shown that 8.8% of the unswept reserve is difficult to be produced after polymer flooding is carried out,13.6% of weakly swept reserve can be produced by increasing oil displacement efficiency,35.7% of the reserve can be produced by expanding the swept volume,and 41.9% of the reserve can only be produced by carrying profile control and water shutoff with high concentration slug to expand the swept volume and then increase oil displacement efficiency.