XX断块剩余油分布规律及控制因素

Residual oil distribution rules and its controlling factors in Block XX

XX断块大凌河油层为一套多油水组合的上倾尖灭边水油藏,经过25a的开发,产量已进入递减阶段。利用油水井在钻井、试油及生产过程中所录取的各项生产资料,采用动态法和常规水淹层解释方法分析其剩余油分布规律,结果表明大Ⅰ层和大Ⅲ层水淹程度相对较高,大0层水淹程度相对较低、剩余油相对较富集;平面上剩余油主要分布在油藏高部位断层、岩性尖灭带、井控程度低和注采系统不完善的地区。层间、层内差异和注采井网的完善程度是控制剩余油分布的主要因素。

Dalinghe reservoir of Block XX is an edge water drive reservoir of updip pinchout, which composes of a set of multiple oilwater combination system. The production rate has gone into a rapid decline phase through the exploitation of 25 years. On the basis of the dynamic method and conventional water flooded zone interpretation method, this paper analyzes the distribution rules of residual oil by using the various production data of oil-water well during drilling, testing and production. The study results show that the waterflooding degree of Da Ⅰ and Da Ⅲ reservoirs is relatively high, and that the waterflooding degree of Da 0 reservoir is relatively low and the residual oil is relatively rich. The residual oil is mainly distributed in the faults of structural high, lithologic pinchout zone, areas of low-degree well control and imperfect injection-production system. The difference between interlayer and intrafonnational and the perfecting degree of injection-production well pattern are the main factors in course of controlling residual oil distribution.