五3东区上乌尔禾组油藏剩余油富集分布研究

Research on Enrichment of Remaining Oil in Upper-Wuerhe Group of V3-Eastern Area in Karamay Oilfield

本文针对五3东区上乌尔禾组低渗透储层非均质性严重、油田高含水、水驱动用程度较差的特点,以精细油藏数值模拟技术为基础,通过油水相对渗透率关系及分流量方程建立了计算水淹程度分布的方法。通过油水相对渗透率关系反求出含水率为98%时的残余油饱和度。建立了计算剩余水驱可采储量分布的方法。在上述研究的基础上,以剩余储量丰度和含水率小于75%的中等水淹程度作为筛选剩余油富集区的第一标准和第二标准。结合有利的地质构造和沉积微相叠合得到剩余油的富集分布。总结了该区块剩余油分布的五种模式,给出了挖潜的有利区域。研究的结果对于指导该区块的二次开发和挖潜调整具有重要的指导作用。

According to the characteristics of low permeability, strong heterogeneity, high water cut and low water flooding producing in Upper-Wuerhe Group of V3-Easten Area in Karamay oilfield, fine reservoir numerical simulation has been performed, and a method to determine the remaining oil in -place is presented based on eco-nomical residual oil saturation from water - oil relative permeability relations at 98% water-cut underground. Enrichment of remaining oil can be gotten based on both remaining reserves abundance and 75 % water-cut below underground for the formation candidate, and then superposition to favorable geological structure and sedimentary microfacies. Five remaining oil distribution patterns are summarized, and characterization of remaining oil in this block has been given after comprehensive analysis. Results of the study will play an important role for secondary development and adjustment to tap production potential.