低渗透油藏中储层流动单元划分

新疆某油田为低孔低渗储层,开发难度大.为合理高效开发,结合取心、测井等资料,以FZI法将研究区储层划分为4类流动单元,并对各类流动单元的岩性、物性、以及渗流性能参数进行研究,发现各类流动单元之间储渗性能差异明显,研究区的生产状况与流动单元类型之间的关系十分密切,射孔井段内Ⅰ类与Ⅱ类流动单元比例较大的井单井产能高,Ⅲ、Ⅳ类流动单元比例较大的井单井产能低.根据流动单元的分布,预测平面上东部、东北部以及剖面上两个层位是Ⅰ类与Ⅱ类流动单元的主要分布带,也是潜在的油气有利分布区.本文的研究结果对于调整注采井网、提高采收率具有重要意义.

Division of the reservoir flow units in low-permeability reservoir

The reservoir of some oilfield in Xinjiang is of low porosity and low permeability,it is very difficult to develop it.To develop it at high efficiency,the reservoir in this area is divided into four types of flow units by FZI(flow zone indicator)based on core and logging data,and the lithilogy and physical property of each type of flow units are studied.It is found that there is obvious difference in permeability of four types of flow units,and that there is very close relationship between single-well productivity and the type of flow units:the wells are of high productivity in whose perforation interval there is greater proportion of Ⅰtype and Ⅱtype flow units,and those are of lower productivity in in whose perforation interval there is greater proportion of Ⅲ type and Ⅳtype flow units.According to the distribution of the flow units,it is held that the east and north-east parts of the studied area in the plane and the horizons of J2t2 and J2t3 on profile are main distribution zones of Ⅰtype and Ⅱtype flow units,and they are also favorable zones to oil and gas distribution.The research results in this paper are of important significance to the injection-production pattern adjustment and the recovery factor enhancing of this area.