利用油藏精细描述技术调整水驱开发方案
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摘要
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。
For many years of development in block C of CYG oilfield,many issues appeared such as low control degree of well pattern on sand body,imperfect injection-production system,quickly increase of water cut and complex watering out situation of the sand body.In order to improve development effect of water drive and tap the potential of remaining oil further in the block,the technique of fine reservoir description is researched.Reknowing on geology is deepened through 3D reservoir modeling technique by logging combined with seism.Models of fine structure,lithofacies and attributes of block C are established.Interwell fault,microstructure and features of reservoir space are known.Numerical simulation for the dual media reservoir is applied for history matching on the development indexes of formation pressure,composite water cut,single-well water cut,liquid producing capacity and degree of reserve recovery.Based on the distribution features of remaining oil in sedimentary units and sand bodies in the pilot area and numerical simulation results,the remaining oil of the block may be classified into seven types,and corresponding measures of tapping the potential are proposed respectively.Based on the distribution of the remaining oil in the pilot area,three cyclic waterflooding programs are designed,and numerical simulation forecasting is carried out.The result shows that average degree of reserve recovery in the pilot area may be enhanced by 1.5% at 90% of the water cut after the cyclic waterflooding than that no cyclic waterflooding(20.32% of the degree of reserve recovery).Countermeasures of tapping the potential and forecast results of the remaining oil may provide foundation for waterflooding programming in the future.
For many years of development in block C of CYG oilfield,many issues appeared such as low control degree of well pattern on sand body,imperfect injection-production system,quickly increase of water cut and complex watering out situation of the sand body.In order to improve development effect of water drive and tap the potential of remaining oil further in the block,the technique of fine reservoir description is researched.Reknowing on geology is deepened through 3D reservoir modeling technique by logging combined with seism.Models of fine structure,lithofacies and attributes of block C are established.Interwell fault,microstructure and features of reservoir space are known.Numerical simulation for the dual media reservoir is applied for history matching on the development indexes of formation pressure,composite water cut,single-well water cut,liquid producing capacity and degree of reserve recovery.Based on the distribution features of remaining oil in sedimentary units and sand bodies in the pilot area and numerical simulation results,the remaining oil of the block may be classified into seven types,and corresponding measures of tapping the potential are proposed respectively.Based on the distribution of the remaining oil in the pilot area,three cyclic waterflooding programs are designed,and numerical simulation forecasting is carried out.The result shows that average degree of reserve recovery in the pilot area may be enhanced by 1.5% at 90% of the water cut after the cyclic waterflooding than that no cyclic waterflooding(20.32% of the degree of reserve recovery).Countermeasures of tapping the potential and forecast results of the remaining oil may provide foundation for waterflooding programming in the future.
引文
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[2]姜岩,李纲,刘文岭.基于地震解释成果的地质建模技术及应用[J].大庆石油地质与开发,2004,23(5):115-117.
[3]王永刚,谢东,乐友喜,等.地震属性分析技术在储层预测中的应用[J].石油大学学报:自然科学版,2003,27(3):30-32.
[4]周游,程时清,张敏.储层建模中变差函数参数的设置[J].西安石油大学学报:自然科学版,2010,25(5):25-27,32.
[5]彭小龙,刘学利,杜志敏.缝洞双重介质数值模型及渗流特征研究[J].西安石油大学学报:自然科学版,2009.31(1):61-64.
[6]马利民,齐玉柱,高尔双.北三区主力油层精细地质研究及剩余油分布探讨[J].大庆石油地质与开发,2000,19(1):22-26.
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