【摘要】 埋存潜力评价是二氧化碳捕集利用与封存(CCUS)潜力评价的重要内容。在区分二氧化碳驱油项目评价期内的埋存量(同步埋存量)和油藏废弃后的埋存量(深度埋存量)基础上,提出了"三参量法"同步埋存量计算方法;在辨析气驱换油率概念基础上,依据物质平衡原理,考虑压敏效应、溶解膨胀、干层吸气和裂缝疏导等,首次得到二氧化碳换油率理论计算公式;联合油气渗流分流方程、Corey模型和Stone方程等相对渗透率计算公式,给出了自由气相形成的生产气油比确定油藏工程方法;根据气驱增产倍数概念,结合水驱递减规律,预测低渗透油藏气驱产量变化情况。总结提出二氧化碳驱油与埋存项目评价期内埋存量"3步评价法",即"油藏筛选→三参量预测→同步埋存量计算",完善了二氧化碳驱油与埋存潜力评价油藏工程理论方法体系。更多还原

【Abstract】 Calculation of how many carbon dioxide can be sequestrated in the underground oil reservoirs is an important aspect of carbon capture utilization and storage（ CCUS） potential evaluation. On the basis of distinguishing the carbon dioxide simultaneous sequestration potential（ CSSP） which is the stored volume during the evaluation period of a CO₂ flooding project and the effective or deep storage of carbon dioxide after the reservoir being abandoned,the called three-parameter calculation method of CSSP is put forward. By including influencing factors such as pressure sensitive effect of pore space,injected gas dissolution,reservoir fluids expansion,fracture systems flowing,dry layer suction and fluids invasion,the calculation method of the substitution ratio of gas to oil（ ratio of carbon dioxide injected to oil produced） was deduced for the first time. Calculation method of the produced gas oil ratio formed by free gas is given by using fractional flowing theory of oil-gas seepage flow,Corey’s relative permeability model of oil and modified stone’s equation for estimation gas relative permeability. The variation of gas flooding in low permeability reservoirs is obtained by employing the concept of "oil production rate multiplier due to gas flooding"combined with the decline law of water flooding. The "three-step evaluation method"of CSSP during the CCUS project evaluation period is advanced: "technical and economic reservoir screening,three-parameter prediction,simultaneous storage calculation".更多还原