延长油田CO2非混相驱地质封存潜力初步评价

摘要

针对CO2驱油项目地质封存潜力评价难度大的问题,选取了一种适合延长油田低渗透油藏CO2驱油与封存的潜力评价模型,从延长油田176个油藏中筛选出87个适合CO2非混相驱的油藏,运用模型对靖边及吴起2个CO2驱油先导试验区的地质封存量及封存潜力进行了评价,全面掌握了延长油田开展CO2非混相驱油的地质封存潜力,为CO2驱油与封存试验区的选择提供了决策参考.经统计与计算,2个先导试验区已累计注入并动态封存CO2约9.4× 104 t,87个适合CO2非混相驱油藏的理论地质封存量约为6×108 t,有效地质封存潜力可达4×108t.%Considering the difficulty to evaluate the potential of CO2 geological sequestration for CO2-EOR project,a CO2 sequestration potential evaluation model for low permeability reservoirs of Yanchang Oilfield was chosen,and 87 reservoirs suitable for CO2 immiscible flooding were selected from 176 reservoirs.The sequestered amount of CO2 in Jingbian and Wuqi pilot test areas were calculated,which provides theoretical support for CO2-EOR and sequestration pilot area screening.Through the statistics and calculation,the accumulated injection and dynamic CO2 sequestration is about 94 000 tons in those two pilot test areas,CO2 theoretical sequestration potential of 87 reservoirs suitable for CO2 immiscible flooding is about 600 million tons,effective sequestration potential is up to 400 million tons.