新民油田高含水期剩余油分布特征及控制因素分析

Distribution Characteristics and Control Factors of Remaining Oil during High Water Cut Stage in Xinmin Oilfield

新民油田目前已经处入高含水开发后期,油水关系复杂,注采矛盾显著,采收率大幅降低,亟待开展精细剩余油分布规律研究。以新民油田民1区块扶余油层为研究对象,基于单砂体精细刻画工作,利用三维地质建模-油藏数值模拟一体化技术开展单砂体层次的剩余油分布研究,进而分析剩余油分布的控制因素。结果表明:剩余油分布特征体现在层间差异、层内差异和平面差异等方面;沉积微相、沉积韵律、单砂体叠置关系、废弃河道遮挡、断层封闭及注采井网不完善等因素单一或组合控制剩余油的分布;层间差异主要受沉积微相控制,层内差异主要受沉积韵律等因素控制,平面差异受控于单砂体叠置关系、废弃河道遮挡、断层封闭及注采井网不完善等因素。

Xinmin oilfield is now in the late stage of high water cut development in which the relationship of oil and water is complex,the contradiction between injection and production is notable and the recovery efficiency has been greatly reduced,so it is necessary to study the detailed distribution of remaining oil.Taking Fuyu oil layer of Min 1 block in Xinmin oilfield as research object,based on fine depiction of single sand bodies,by integrated technology of three-dimensional geological modeling and reservoir numerical simulation,the distribution characteristics and control factors of remaining oil were studied.The results show that the distribution characteristics of remaining oil are embodied in inter-layer,intra-layer and plane differences.The control factors of remaining oil are sedimentary facies,sedimentary rhythm,superimposition relationship of single sand bodies,abandoned channel barrier,fault sealing and imperfect injection-production pattern.And these factors control the distribution of remaining oil singly or in combination.Inter-layer difference of remaining oil is mainly controlled by sedimentary facies,intra-layer difference is principally controlled by sedimentary rhythm and plane difference is mainly dominate by superimposition relationship of single sand bodies,abandoned channel barrier,fault sealing and imperfect injection-production pattern.