Abstract: The high water cut sandstone oilfields in Kazakhstan involve the MMG project, the PK project and the related oilfields of the North Buzzaki project. After long⁃term water flooding, these oilfields have entered a stage of rapid decline, low⁃efficiency and high water cut. Taking the North Buzzaki oilfield as an example, this paper addresses the characteristics of remaining oil distribution by comprehensive analysis of material balance, log interpretation, performance, water channel and numerical simulation in order to improve remaining oil recovery in high water cut sandstone oilfield. The results show that, longitudinal distribution of remaining oil is affected by sedimentation rhythm and heterogeneity, differently enriched in layers and in⁃between layers, and laterally enriched in those sites of weak conformance as a result of sedimentary environment and petrophysical properties. Combined with the characteristics of water flooding and the characteristics of remaining oil enrichment, adjustment measures are formulated to maximize both recovery factor and economic benefits during the contract period.

Key words: High water cut, Sandstone, Remaining oil

摘要： 　哈萨克斯坦高含水砂岩老油田涉及中石油中亚MMG、PK和北布扎奇项目的相关油田。经过长期注水开发，油田均已进入高含水快速递减及低效开发阶段。为了提高高含水期砂岩老油田剩余油采收率，以北布扎奇油田为例，运用物质平衡、测井解释、动态分析、水流通道、数值模拟等综合分析方法，开展了剩余油分布特征系统攻关与实践。结果表明，纵向上受储层沉积韵律和非均质性影响，层内、层间剩余油差异富集，平面上受沉积环境和储层物性影响，水驱波及弱势方向剩余油局部富集。结合注水开发矛盾和剩余油富集特点，制定注采井网调整和注水方式优化综合调控对策，实现油田合同期内采收率与经济效益最大化。

关键词: 高含水, 砂岩, 剩余油