渤南油田十区断块油藏剩余油分布规律

Distribution Laws of Residual Oil of Fault-Block Oil Reservoir in Tenth District of Bonan Oilfield

渤南油田十区为中渗透断块油藏,经过近20年的滚动勘探开发,于2001年进入快速递减期。在确定沉积体系和开发效果评价的基础上,深入研究了剩余油分布规律。受储层非均质性、采液强度和流体重力分异作用的影响,叶状体和水道间微相、构造高点、正韵律油层顶部水淹程度相对较轻,剩余油富集。通过采取挖潜措施,采收率提高3.8%。

Exploitation of the tenth district,a fault-block oil reservoir with medium permeability,has developed into a rapid decline phase after 20 years of rolling exploration and exploitation.The paper pays further study of the distribution laws of residual oil based on the establishment of the sediment system and the estimation of the exploitation effect.It points out the fact that residual oil gathers in the leaf face belt between channels,area of the structure high point and the upper part of the positive rhythm which resulted from the reservoir heterogeneity,different intensity of the liquid production and gravity differential effect.Recovery factor has increased by 3.8% with the adoption of adjustment well,sealing the water-bearing beds,perfection of production-injection system and unstable injection,etc.