东风港油田特低渗透油藏微观孔隙结构及渗流特征试验研究

发布时间：2018-05-07 11:12

  本文选题：特低渗透油藏 + 微观孔隙结构　； 参考：《石油钻探技术》2017年02期

【摘要】：为了经济有效地开发东风港油田特低渗透油藏,对其储层的微观孔隙结构及渗流特征进行了试验研究。以沙四段上段为例,选取具有代表性的4块岩心,利用恒速压汞仪器,分别获得了其喉道半径、孔隙半径、孔喉半径比和毛管压力的分布特征;在70℃条件下,采用非稳态法分别对4块岩心进行水驱油相渗试验,获得了特低渗透储层的渗流特征。试验得出,喉道半径分布范围越宽峰值越大,孔隙半径分布差别不明显,孔隙半径比因渗透率不同而不同,特低渗透岩心排驱压力大,最大连通喉道半径比较小,储层开采难度相对较大;该储层平均束缚水饱和度相对较高,随着渗透率的升高,两相共渗区跨度逐渐减小。研究结果表明,驱油效率和渗透率高低相关性差;正常型相对渗透率曲线对应的多是孔喉半径比较大、连通性较差的储层,而直线型相对渗透率曲线对应的则是孔喉半径比相对较小、孔隙连通性较好的储层。因此,厘清微观孔隙结构对于合理制定开发方案具有指导意义。
[Abstract]:In order to develop the very low permeability reservoir of Dongfeng Port oilfield economically and effectively, the microscopic pore structure and percolation characteristics of the reservoir are studied experimentally. Taking the upper member of the 4th member of Sha formation as an example, the distribution characteristics of throat radius, pore throat radius ratio and capillary pressure were obtained by using the constant velocity mercury pressure instrument and four representative cores were selected, respectively, at 70 鈩，

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