多层系断块油藏二次开发地下认识体系重构——以沾化凹陷河滩油田为例

Reconstruction of Understanding System for the Redevelopment in Fault-Block Multilayer Reservoir:Case of Hetan Oilfield in Zhanhua Sag

针对沾化凹陷河滩油田含油层系多、非均质严重、剩余油分布零散及地面系统老化严重的问题,遵循老油田二次开发理念,以重构地下新的认识体系为目标,应用三维地震资料、取芯资料和测井资料,开展断块油藏精细构造研究和精细储层研究。在此基础上,综合应用监测资料、历史注采状况、数值模拟和油藏工程方法,准确评价和量化剩余油潜力。采取边认识边调整的思路,油田开发效果取得初步改善,明确了二次开发必须具备的物质基础,并编制了二次开发实施方案,为全面改善油藏开发效果,大幅度提高油田采收率奠定基础。

In view of the problems of Hetan Oilfield in Zhanhua Sag such as multiple oil-bearing series,strong heterogeneity,scattered remaining oil distribution,and aging gathering and transportation system,the authors follow the principle of redevelopment to old oilfield,take the reconstruction of new understanding system of underground reservoirs as the target.3D seismic data,core data and well log were applied to carry out fine structure research of fault block oilfield and fine reservoir research.Based on the research,through the comprehensive technology application of monitoring data,history of injection-production condition,numerical simulation and reservoir engineering method,the residual oil potential was evaluated and quantified accurately.Taking the idea of adjustment while understanding,the effect of oilfield development achieves initial improvement,the requisite material foundation of the redevelopment is clear and the redevelopment plan is worked out.All this lay the foundation for improving the level of reservoir development and enhancing the recovery ratio.