枯竭气藏CO2埋存潜力计算方法研究

doi:10.13809/j.cnki.cn32-1825/te.2021.06.009

摘要/Abstract

摘要：

温室气体CO₂地质封存是应对碳达峰和碳中和的重要手段,而枯竭气藏是埋存CO₂优势显著的靶点。基于CO₂在气藏中的不同存在形式,考虑溶解埋存和矿化埋存等机理,在气藏CO₂理论埋存量计算方法的基础上,建立气藏CO₂有效埋存量计算方法,可用于估算枯竭气藏CO₂埋存潜力。建立低渗气藏机理模型,在开发后期进行CO₂埋存,考虑CO₂溶解于地层水及CO₂与水和岩石发生矿化反应,对比计算结果与数模结果,超临界埋存量、溶解埋存量和矿化埋存量的误差分别为2.81 %、7.37 %和6.25 %,有效埋存量误差仅为3.06 %。

关键词: CO₂驱, 埋存潜力, 枯竭气藏, 数值模拟, 埋存机理

Abstract:

The geological sequestration of greenhouse gas, CO₂, is an important means to cope with carbon peaking and carbon neutralization. However, the depleted gas reservoirs are the significant targets for the storage of CO₂. Due to the different forms of CO₂ in gas reservoirs, the effective CO₂ storage calculation method of gas reservoirs is established based on the theoretical CO₂ storage calculation method, which can be used to estimate the CO₂ storage potential of the depleted gas reservoirs. Meanwhile, the model of low permeability gas reservoir is established for the CO₂ storage in the later stage of the development. Considering the dissolution of CO₂ in formation water and the mineralization reaction of CO₂ between water and rock, the error of supercritical buried stock, dissolved buried stock and mineralized buried stock is 2.81 %, 7.37 % and 6.25 %, respectively, and the error of effective buried stock is only 3.06 % by comparing the calculated results with the numerical and analog results.

Key words: CO₂ flooding, CO₂storage potential, depleted gas reservoir, numerical simulation, storage mechanism

中图分类号:

TE341

唐良睿,贾英,严谨等. 枯竭气藏CO₂埋存潜力计算方法研究[J]. 油气藏评价与开发, 2021, 11(6): 858-863.

Liangrui TANG,Ying JIA,Jin YAN, et al. Study on calculation method of CO₂ storage potential in depleted gas reservoir[J]. Petroleum Reservoir Evaluation and Development, 2021, 11(6): 858-863.

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参数	值	参数	值
累计采出天然气体积（10⁹m³）	0.746	气藏温度（℃）	85
埋存时恢复原始地层压力（MPa）	25	含水饱和度	0.35
气藏面积（km²）	2.64	气藏厚度（m）	30
气藏孔隙度	0.08	地层水的密度（kg/m³）	1 000
矿化度（mg/L）	0	气藏深度（m）	1 540

结果对比	总埋存量（10⁶ t）	超临界埋存量（10⁶ t）	溶解埋存量（10⁶ t）	矿化埋存量（10⁶ t）
模拟	2.191	2.064	0.095	0.032
计算	2.124	2.006	0.088	0.030
误差（%）	3.06	2.81	7.37	6.25

枯竭气藏CO₂埋存潜力计算方法研究

Study on calculation method of CO₂ storage potential in depleted gas reservoir

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