摘要
以流动单元控制建立的储层模型为基础,开展油藏数值模拟研究,对NH25油藏剩余油分布规律及主控因素进行了深入分析。结果表明,构造高部位及局部正向微构造是剩余油富集区。根据夹层与油水运动耦合作用,提出了4种夹层分布模式,其中无夹层模式底水快速锥进,远离井筒周围分布大量剩余油;渗滤型夹层开发效果好,剩余油较少;小范围不渗透夹层极易在夹层底部形成"屋檐油",顶部形成"屋顶油";大范围不渗透夹层上下邻层均可形成大量剩余油富集区。物性较差的流动单元及不同物性流动单元的过渡区是剩余油富集区。正韵律储层顶部形成剩余油富集区,反正复合韵律储层顶底形成"汉堡式"剩余油分布区,正反复合韵律储层中部形成"工字型"剩余油分布区。井网不完善区剩余油容易富集。
Based on the reservoir model,which is built and controlled by flow units,the reservoir numerical simulation is carried out,and the distribution rule and its main controlling factors of remaining oil are thoroughly summarized in this paper.Structural high position and locally positive micro-structures are the accumulation area for remaining oil.Four interlayer distribution patterns have been pro-posed based on interlayer controlling on oil and water movement,the bottom water coning speed is high,the areas far from borehole contain enormous remaining oil in the non-inter-bedded model,the permeable-inter-bedded model has been thoroughly extracted by water displacement and within which little remaining oil can be found,In the small area impermeable model,the roof oil accumu-lated in the upper inter-bedded layers,and the eaves oil concentrated in the bottom inter-bedded layers.In the large area imperme-able model,abundant remaining oil can be formed between the top layer and bottom layer in the large area impermeable model.The low permeable flow units and the transitional position between different flow units can hold enormous remaining oil,moreover,the top of positive rhythm reservoir can accommodate abundant remaining oil,and the 'Hamburg' remaining oil is formed in the top and bottom of inverse-positive rhythm,the net shape remaining oil is formed in the middle part of positive-inverse rhythm.Incomplete well pattern is apt to cause accumulation of remaining oil.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2010年第6期78-81,共4页
Petroleum Geology and Recovery Efficiency
基金
国家油气重大专项"海上稠油油藏不同井型生产能力及注入能力评价技术研究"(2008ZX05024-04-003)
