边水断块油藏层系重组的技术政策界限

Study on technical policy limits of layer recombination in edge water fault block reservoir

边水断块油藏具有纵向上含油层系多、层间非均质性强及各小层的含油条带宽度和水体倍数差异大等特点,当含油条带宽度和水体倍数相差较大的小层组合为一套层系进行开发时,对井网的部署及开发效果影响较大。因此,在层系重组时,除考虑渗透率级差和粘度级差等政策界限外,还应考虑含油条带宽度级差和水体倍数级差界限。通过分析含油条带宽度和水体倍数不同的小层组合对开发效果的影响,建立了层系重组的含油条带宽度级差和水体倍数级差政策界限,并将研究结果应用到东辛油田辛11-21断块油藏沙二段11—W砂层组的层系重组方案中,增加可采储量为19.32×104t,最终采收率由46.5%提高到50.4%,能够达到较好的开发效果。

Fault block reservoir possesses the characteristics of many oil-bearing strata, serious heterogeneity. In addition, for the layers in the edge water fault block reservoirs, their oily strip width and edge water body multiples are different. The combination of the layers with different oily strip width and edge water body multiples have great impact on the development effect of the development unit. Therefore, in addition to considering the policy limits of permeability differences and oil viscosity differences, such the policy limits as oily strip width differences and edge water body multiples differences should be considered during the layers recombination. In this paper, the effect of the combination of different layers with oily strip width differences and edge water body multiples differences on the reservoir performance is analyzed. And, the policy limits of oily strip width differences and edge water body multiples differences are set up. The research result was applied to the actual fault block reservoir development, and achieved good results.