海上强非均质性砂岩油藏开发水平分级研究

The Study of Development Level Classification for Strongly Heterogeneous Sandstone Reservoirs at Sea

海上砂岩油藏由于储层非均质性强引起层间开发效果不均,不同开发阶段开发水平不清,油藏潜力认识不足.传统分级方法由于指标范围统一,采用指标绝对标准评价,导致无法反映油藏真实开发水平.为解决此问题,该文应用指标相对标准评价方法,增加复杂断块油藏储层综合分类评价和井网适应性评价,针对海上油田高速开发的特点,引入剩余可采储量采油速度指标改善分级体系;同时引入水驱体积波及系数,改进传统的理论含水上升率计算偏小的问题,初步建立适应于海上复杂断块油藏的开发水平分级新体系.以某A油田为研究靶区,开展水驱开发水平分级研究,指出处于三类开发水平的油组潜力较大,结合剩余油分布精细研究成果提出三口调整井方案,预测累增油23.9×10^4m^3,成功指导油田精细挖潜.

Due to the strong reservoir heterogeneity, interlayer development effect of offshore sandstone reservoirs is uneven, the development level at different stages is not clear, reservoir potential is poorly understood. The traditional classification method uses the absolute standard of indicators to evaluate, and the scope of indicators is unified, which does not reflect the real development level. In this paper, the relative standard of development level classification is used to evaluate, increase reservoir comprehensive classification evaluation and well pattern adaptability evaluation for complex fault block reservoirs. Aiming at the characteristics of high-speed development of offshore oilfields, introduce recovery rate evaluation of remaining recoverable reserves to improving classification system. At the same time, the volume sweep coefficient of water drive is introduced to improve the problem that traditional theoretical water cut rise rate is too small. Based on the above researches, a new system of development level classification for complex fault block reservoirs is established. An oilfield is used as the research target area to carry out the development level classification. According to the evaluation results, the potential of oil formation in three development levels is large. Combined with the fine research results of remaining oil distribution, three adjustment wells are put forward to predict the cumulative increase of 239 000 cubic meters of oil, which has successfully guided the fine exploration of oil field potential.