西安石油大学学报（自然科学版）2017，Vol.32Issue(5)：55-61,7.DOI:10.3969/j.issn.1673-064X.2017.05.009
裂缝对鄂尔多斯盆地陇东地区长7致密岩心水驱渗流特征的影响
Impact of Fractures on Water Flooding Seepage Features of Chang 7 Tight Cores in Longdong Area, Ordos Basin
摘要
Abstract
Based on the analysis of the characteristics of natural fractures and artificial volume fracturing fractures in Chang 7 reservoir of Ordos Basin,the influence of fracture on water flooding seepage characteristics of the Chang 7 tight cores was studied by equivalent treatment core experiment.The experimental results show that:①whether matrix or fracture seepage is dominated,the relative permeability curve of oil phase always presents chair-shaped;with the increase of the permeability difference between fracture and matrix and the core displacement pressure difference,compared with the cores dominated by matrix seepage,the equivalent permeability point on the permeability curves of the cores dominated by fracture seepage shifts towards the left,the relative permeability of water phase and oil phase becomes greater,however,the two-phase flow zone becomes narrower,the water cut and residual oil saturation rapidly increase.② Under the same displacement pressure difference,the low water-cut displacement time of the tight cores becomes shorter and the watercut increasing speed after water breakthrough becomes greater with the increase of the permeability difference between fracture and matrix.③With the increase of the core displacement pressure difference,the water breakthrough of the cores is ahead of time,the displacement efficiency before water breakthrough and ultimate displacement efficiency of the cores dominated by matrix seepage will increase,while those of the cores dominated by micro-fractures seepage will decrease.关键词
裂缝/致密岩心/水驱/渗流特征/陇东地区/鄂尔多斯盆地Key words
fracture/tight core/water flooding/seepage feature/Longdong area/Ordos Basin分类
能源科技引用本文复制引用
屈雪峰,樊建明,王冲,赵国玺,时建超..裂缝对鄂尔多斯盆地陇东地区长7致密岩心水驱渗流特征的影响[J].西安石油大学学报（自然科学版）,2017,32(5):55-61,7.基金项目
国家科技重大专项“鄂尔多斯盆地致密油开发示范工程”(2017ZX05069) （2017ZX05069）
