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CYG油田C区块经过多年开发,逐渐暴露出井网对砂体的控制程度低、注采系统不够完善、含水上升较快和砂体水淹状况复杂等问题。为提高区块水驱开发效果,进一步挖潜剩余油,开展了油藏精细描述技术研究。利用井震联合三维储层建模技术深化了地质再认识,建立了C区块的精细构造、岩相和属性模型,明确了井间断层、微构造及储层空间特征。利用双重介质油藏数值模拟技术对地层压力、综合含水率、单井含水率、产液量、采出程度等开发指标进行了历史拟合。结合试验区各沉积单元、各砂体剩余油分布特征及数值模拟结果,将区块剩余油类型分为7种类型,分别提出了具体挖潜对策。根据试验区剩余油分布情况,设计3种周期注水方案,并据此进行了数值模拟预测。预测结果表明:采取周期注水调整后,当含水率为90%时,与不进行调整(采出程度为20.32%)相比,试验区平均水驱采出程度可提高1.5个百分点左右。剩余油挖潜对策和预测结果为下步编制水驱挖潜调整方案提供了依据。
After years of development, Block C of CYG gradually exposed such problems as low well control of the sand body, imperfect injection and production systems, rapid rise of water cut, and complicated flooding of sand bodies. In order to improve the development effect of water flooding in the block and to further tap the remaining oil, a study on the fine description of the reservoir has been carried out. Deepening the re-recognition of geology by using well-seismic combined 3D reservoir modeling technology, the fine structure, lithofacies and attribute models of C block were established, and the cross-well faults, micro-structures and reservoir space characteristics were clarified. Based on the numerical simulation technology of dual-medium reservoir, history matching of formation pressure, integrated water content, single-well water content, production fluid volume, recovery degree and other development indexes were carried out. Based on the distribution characteristics of residual oil and the results of numerical simulation in each sedimentary unit and each sand body in the experimental area, the remaining oil types in the block are divided into seven types, and specific measures for tapping potential are proposed respectively. According to the remaining oil distribution in the experimental area, three kinds of periodic water injection schemes were designed and numerical simulation was carried out. The results show that when the waterflooding rate is 90%, the average waterflood recovery in the experimental area can be increased about 1.5% compared with no adjustment (20.32% recovery rate). Remaining oil tapping potential and forecasting results provide the basis for the next step to adjust water diversion plans.