长春岭油田长109区块异常高含水带形成机制

Formation Mechanism of Anomalously High Water-cut Zone in Chang 109 Block of Changchunling Oil Field

长春岭油田长109区块开发初期在中央构造带出现异常的高含水条带,造成多数油井水淹,严重影响了油田的开采效果。高含水带油井均射开了5+6小层的4号单砂体;而周围含水较低的,井在该层不发育,微电阻率曲线反映5+6小层4号单砂体为水层,5+6油层4号单砂体夹水层是造成高含水带的一个主要因素。根据油水井动态分析,研究了长109区块高含水带的分布特征,在对地层水与注入水水质对比分析的基础上,明确了地层水、注入水共同作用是产生异常高含水带的另一个重要因素。该认识对长春岭油田注水开发调整提供了可靠的地质依据。

In the initial exploitation stage of Chang 109 Block in Changchunling oil field,the high water-cut zone of the central structural belt caused most oil wells flooded and affected production performance seriously.The wells in high water-cut zone penetrated the single sand body No.4 in the fifth and sixth small layers,but low watercut wells around don＇ t develop in this layer.The micro-resistivity curve reflects that the single sand body No.4 in the fifth and sixth small layers is water layer,and it is a major factor of high water-cut zone.According to dynamic analysis of wells,distribution characteristics of the high water-cut zone in Chang 109 block is studied,and found that the combined effect of formation water and injected water is another important deteminant of causing anomalously high water-cut zone based on water quality comparison analysis between them.This research provides credible geological foundations for water flooding development adjustment in Changchunling oil field.