Study on CO2 Storage and CH4 Recovery Enhancement in Tight Sandstone Gas Reservoirs

doi:10.7657/XJPG20250509

Abstract

Abstract:

The CO₂ storage and enhanced gas recovery (CS-EGR) technology represents a promising option for boosting production in the context of “dual carbon” goals. However, its application in tight sandstone gas reservoirs has been scarcely studied, and its field performance remains unclear. This study establishes a reservoir-scale numerical model based on a comprehensive analysis of gas-water two-phase flow mechanisms and stress sensitivity across three reservoir types. Using this model, the adaptability of CO₂ injection to reservoirs, CO₂ migration behaviors, CO₂ trapping mechanisms, impacts of movable water on the CS-EGR process, and optimization of engineering parameters for CS-EGR are analyzed. It is indicated that CS-EGR is viable only for Class Ⅰ reservoirs, but less performed in Class Ⅱ and Class Ⅲ reservoirs. In terms of CO₂ trapping mechanism, both structural trapping and residual trapping account for 95.8%, while CO₂ mineralization and storage contributes 0.15%. For Class Ⅰ reservoirs, the optimal CO₂ injection rate is 10,000 m³/d, the cumulative production of CH₄ is 0.146×10⁸ m³ when CO₂ breaking through, and the cumulative storage of CO₂ is 0.794×10⁸ m³. Movable water significantly hinders CO₂ migration and increases the risk of gas well flooding.

Key words: tight sandstone gas reservoir, pore throat structure, gas recovery, CO₂ storage, sensitivity analysis

CLC Number:

TE357

JIANG Yi, YANG Shenglai, BAI Haoyan, CHEN Yingli, MEI Qingyan, WANG Beidong. Study on CO₂ Storage and CH₄ Recovery Enhancement in Tight Sandstone Gas Reservoirs[J]. Xinjiang Petroleum Geology, 2025, 46(5): 591-599.

Figures/Tables 13

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样品编号	孔隙度/ %	气测渗透率/mD	孔喉半径中值/μm	变异系数	偏态	截止喉道体积比	最大进汞饱和度/%	孔喉结构系数	孔喉结构类型
1	10.11	0.543	0.261	7.834	0.392	0.641	90.12	4.534	Ⅰ类
2	9.86	0.456	0.213	8.014	0.186	0.364	89.23	4.407	Ⅰ类
3	9.31	0.108	0.171	11.835	0.221	0.134	84.87	6.275	Ⅱ类
4	9.21	0.084	0.181	12.726	0.241	0.114	84.26	6.735	Ⅱ类
5	8.42	0.021	0.018	16.324	-0.486	0.127	81.32	8.243	Ⅲ类
6	8.23	0.019	0.021	17.526	-0.574	0.246	82.74	8.876	Ⅲ类

储集层类型	束缚水饱和度/%	束缚水饱和度下气相相对渗透率	等渗点含水饱和度/%	等渗点相对渗透率	残余气饱和度/%	气水两相共渗区含水饱和度/%
Ⅰ类	40.23	0.435	56.48	0.103	17.64	40.23~82.36
Ⅱ类	44.16	0.214	56.01	0.063	25.64	44.16~74.36
Ⅲ类	47.25	0.107	55.13	0.031	28.74	47.25~71.26

参数	数值
盖层/（底层）厚度/m	5
盖层/（底层）孔隙度/%	0.01
盖层/（底层）渗透率/mD	0.000 1
储集层厚度/m	20
Ⅰ类储集层渗透率/mD	0.500 0
Ⅱ类储集层渗透率/mD	0.100 0
Ⅲ类储集层渗透率/mD	0.020 0
储集层原始孔隙压力/MPa	30
衰竭开发废弃压力/MPa	8
储集层孔隙度/%	10.00
岩石密度/（kg·m^-3）	2 600
岩石压缩系数/kPa^-1	3×10^-8
储集层温度/℃	75
储集层孔隙压力/MPa	30
CO₂注入速率/（m³·d^-1）	10 000
注入井井底允许最大压力/MPa	50
钾长石体积分数/%	26
钠长石体积分数/%	10
石灰石体积分数/%	8
白云石体积分数/%	2

Study on CO₂ Storage and CH₄ Recovery Enhancement in Tight Sandstone Gas Reservoirs

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