高含水油田剩余油分布规律及控制因素分析

ANALYSIS OF RESIDUAL OIL DISTRIBUTION RULES AND CONTROLLING FACTORS IN KUMKOL OILFIELD

经过近20年的开发,NS油田已进入高含水期,含水率持续上升,综合递减率逐年加大。通过综合研究油水井在钻井、石油及生产过程中所录取的各项资料,采用动态分析法和常规水淹层解释法分析了其剩余油分布规律,结果表明K2层水淹程度相对较低,剩余油相对富集;平面上剩余油主要分布在油藏构造高部位、断层遮挡处、井网控制程度低以及注采系统不完善的地区。微构造、沉积微相和注采井网的完善程度是控制剩余油分布的主要因素。

Kumkol oilfield has entered into the high water cut stage through the exploitation of 20 years,facing many problems such as the water cut continued to increase and the production rate has gone into a rapid decline phase.On the basis of the dynamic method and conventional water flooded zone interpretation method,the distribution rules of residual oil were analyzed by using the various data of oil-water well during drilling,testing and production.The study results showed that the water-flooding degree of Object Ⅱ reservoir was relatively low and the residual oil was relatively rich.The residual oil was mainly distributed in the faults of structural high,the fault sheltered,areas of low-degree well control and imperfect injection-production system.Microstructure,sedimentary facies and the perfecting degree of injection-production well pattern were the main factors in course of controlling residual oil distribution.