克拉玛依油田八区下乌尔禾组油藏的孔隙结构与动态特征

下乌尔禾组砾岩储层的孔隙结构复杂,具有微观和宏观的特殊非均质性。这种非均质性表现在岩样空气渗透率值波动大,油井测试数据计算的渗透率值大于岩样测量值和毛管压力曲线呈现双峰和三峰型。这种非均质性使得岩样测量物性值难以用于估测油藏的开发动态,也影响到人们对油层渗流过程的认识。本文试图通过观察岩芯孔隙宏观分布、分析毛管压力曲线结合渗流力学的基本原理和油井测试分析等手段,以期揭示砾岩的孔隙结构与油藏动态特征之间的内在联系。

PORE GEOMETRY AND ITS DYNAMIC FEATURE OF CONGLOMERATE RESERVOIR OF THE LOWER WUERHE FORMATION IN 8TH DISTRICT,KARAMAY OILFIELD

A view of dual and triple pore-medium of pore-group is proposed in this paper.According to macroscopic observation and data analysis of capillary pressure test in core samples,it has been proved that a few non-fractured pore-networks coexist with each other in the conglomerate reservoir of the Lower Wuerhe Formation,the 8th district of Karamay oilfield.In well testing,the re-servoir of this kind shows the feature of dual or triple pore-medium curves.In order to feature precisely the property of such reservoir with multiplesets of pore-network,a new conception of pore-group is termed by the au-thors,thus the geometric property of pores is closely connected with its geo-logical origin.What's more,this new conception reveals profoundly the natureof seepage flow in the reservoirs—the basic framework of seepage flow in reser-voir is formed by the combination and interaction of pore-groups.