深部咸水层CO2地质封存相平衡参数修正模型

doi:10.13809/j.cnki.cn32-1825/te.2025313

Abstract

Abstract:

In numerical simulations of CO₂ storage sequestration in saline aquifers, calculating the gas-water phase equilibrium is a critical step for determining the physical property parameters of the gas-water system, and their accuracy directly affects the reliability of simulation results. Current simulations of CO₂-brine phase equilibrium often inadequately account for ionic effects and fail to build upon established gas-water phase equilibrium frameworks, thereby compromising result reliability. This study aims to establish a high-precision CO₂-brine phase equilibrium model. Based on the law of molar conservation and fugacity equality principles, an innovative phase equilibrium model incorporating ionic effects was established. The model accuracy was validated through comparison with experimental data, and phase equilibrium patterns during CO₂ storage in deep saline aquifers under different formation conditions were analyzed. The results indicated that the modified physical property parameters could accurately characterize CO₂ solubility in both single-salt and mixed-salt solutions. The established model could quantitatively describe key indicators in CO₂-brine phase equilibrium calculations, including liquid-phase molar density, gas-phase molar density, component molar fractions, and saturation. The presence of ions increased the mole fraction of H₂O while decreasing that of CO₂ in the liquid phase. It simultaneously increased the liquid-phase molar density but reduced liquid-phase saturation. Gas-phase component composition and molar density remained essentially unchanged, while gas-phase saturation exhibited an upward trend. Higher ionic concentrations exerted more significant effects on phase equilibrium calculations. Notably, Ca²⁺ and Mg²⁺ ions exerted substantially stronger effects than Na⁺ and K⁺ ions. This model established in this study overcomes the limitations of traditional models by inheriting the framework of the gas-pure water system and innovatively introducing ionic correction. This study provides high-precision fundamental data for numerical simulation of CO₂ storage in deep saline aquifers, offering significant theoretical value for advancing carbon storage technology. This model is derived from the gas-pure water system model and demonstrates good extendability.

Key words: deep saline aquifers, gas-water phase equilibrium, molar conservation, CO₂ geological storage, molar density

CLC Number:

TE375

YANG Long,XU Xun,GUO Liqiang, et al. Correction model for phase equilibrium parameters of CO₂ geological storage in deep saline aquifers[J]. Petroleum Reservoir Evaluation and Development, 2026, 16(1): 61-73.

Figures/Tables 11

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参数	值	参数	值	参数	值
a₁	0.039 394 508	b₁	1.451 202 619	α_SO₄	0.141 383 311
a₂	0.135 713 591	b₂	-0.674 455 161	β_Na	1.000 000 000
a₃	-0.712 527 769	b₃	-1.307 789 474	β_K	0.493 470 401
a₄	0.026 383 234	b₄	0.110 484 625	β_Ca	2.417 927 979
a₅	0.684 871 035	b₅	0.414 800 056	β_Mg	2.303 224 888
a₆	-0.685 118 723	b₆	0.124 922 088
a₇	0.246 235 689	b₇	-0.044 053 682
a₈	0.676 925 539	b₈	-0.117 540 325
a₉	-0.226 694 802	b₉	0.036 097 248
a₁₀	-0.000 807 745	b₁₀	0.000 015 978

体系	温度/K	压力/MPa	质量摩尔浓度/(mol/kg)	数据点数	参考来源
CO₂-H₂O-CaCl₂	323.15~423.15	6.5~59.5	0.73~2.75	43	文献[32]
CO₂-H₂O-KCl	323.15~423.15 323.15~423.15	8.2~55.0 15.0	1.49~3.78 0.50~4.50	26 18	文献[32] 文献[33]
CO₂-H₂O-MgCl₂	323.15~423.15 323.15~423.15	8.2~55.0 15.0	0.75~4.29 0.33~2.00	35 18	文献[32] 文献[33]
CO₂-H₂O-Na₂SO₄	313.15~433.15	0.4~9.7	1.01~2.01	98	文献[34]
CO₂-H₂O-NaCl	303.15~333.15 323.15~423.15 423.00~723.00	10.0~20.0 15.0 10.0~140.0	0.17~0.53 1.00~6.00 0~4.28	36 18 123	文献[35] 文献[33] 文献[36]
CO₂-H₂O-NaCl-KCl	308.15~425.15	1.0~17.5	0.90NaCl~0.14KCl	14	文献[37]
CO₂-H₂O-NaCl-CaCl₂	323.00~423.00	10.0~17.5	2.99NaCl~0.67CaCl₂	12	文献[33]

体系	相关系数	最大偏差/%	最小偏差/%	平均偏差/%
平均值	0.985 1	12.12	0.13	3.19
CO₂-H₂O-CaCl₂	0.970 5	14.58	0	4.29
CO₂-H₂O-KCl	0.958 7	11.30	0.32	3.89
CO₂-H₂O-MgCl₂	0.983 8	13.54	0.05	3.68
CO₂-H₂O-Na₂SO₄	0.998 4	17.58	0.02	2.01
CO₂-H₂O-NaCl	0.991 7	9.88	0.31	3.42
CO₂-H₂O-NaCl-KCl	0.995 6	13.77	0.11	3.64
CO₂-H₂O-NaCl-CaCl₂	0.997 3	4.18	0.10	1.43

Correction model for phase equilibrium parameters of CO₂ geological storage in deep saline aquifers

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Correction model for phase equilibrium parameters of CO2 geological storage in deep saline aquifers

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Correction model for phase equilibrium parameters of CO₂ geological storage in deep saline aquifers