摘要
砂岩底水油藏在中国储量丰富,底水油藏开发面临的核心问题是底水锥进,而夹层对抑制底水锥进具有明显效果。由于夹层成因的复杂性,目前夹层研究尚没有统一模式。针对这一问题,提出从夹层分布面积、夹层厚度、夹层渗透率、夹层泥质含量等参数,将夹层归纳为无夹层、渗滤型夹层、小范围不渗透夹层和大范围不渗透夹层4种模式。无夹层模式底水锥进速度快,大范围不渗透夹层模式底水完全被抑制,这两种夹层模式下的油气开发效果较差;渗滤型夹层底水被转化为次生边水和次生底水,小范围不渗透夹层底水转化为次生边水,这两种夹层模式开发效果较好。无夹层模式远离井筒周围分布大量剩余油,可以通过完善井网来提高动用程度;渗滤型夹层开发效果好,剩余油分布很少;小范围不渗透夹层底部形成"屋檐油",顶部形成"屋顶油",这种剩余油可作为后期挖潜的一个方向;大范围不渗透夹层上下邻层均可存在大量的剩余油,是油田开发后期挖潜的重点对象。
The sandstone-bottom water reservoirs can be widely found in China,a critical problem for developing the reservoir is bottom water coning.Inter-bedded stratum can constraint this phenomenon with a satisfactory effect.However,due to the complexity of the origin of inter-bedded stratum,there′s no uniform research model of it.Aiming at this issue,it is pointed out that according to the some parameters of inter-bedded stratum such as area,thickness,permeability and shale content,various inter-bedded strata can be approximated as non-inter-bedded model,permeable model,small area impermeable model and impermeable model.The field exploration effect is not good in both non-inter-bedded models in which the bottom water coning speed is high and large area impermeable model in which bottom water coning is totally constrained.On contrast,field exploration effect is good in permeable model in which bottom water is transformed into secondary edge water and secondary bottom water and small area impermeable model in which bottom water is transformed into secondary edge water.In the non-inter-bedded model,the area far from wellbore contains enormous remaining oil which can be recovered by improving the well pattern.Permeable model enjoys a good effect of exploration in which little remaining oil can be found.Under the small area impermeable stratum,'roof'oil will form which can be a research direction in late-stage development.Much remaining oil can be formed between the up layer and down layer in the large area impermeable interbeds which is the highlight of late-stage exploration.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第3期101-106,共6页
Journal of Southwest Petroleum University(Science & Technology Edition)
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)
关键词
砂岩油藏
底水油藏
夹层
油藏开发
油水运动
剩余油
sandstone reservoir
bottom water reservoir
inter-bedded stratum
reservoir development
oil and water movement
remaining oil
