致密砂岩气藏CO2埋存及提高CH4采收率

doi:10.7657/XJPG20250509

摘要/Abstract

摘要：

CO₂埋存与提高气藏采收率协同开发（CS-EGR）技术是“双碳”背景下极具前景的增产措施，该技术在致密砂岩气藏中的相关研究较少，矿场应用效果尚不明确。在明确3类储集层气水两相流动规律及应力敏感性的基础上，建立了矿场尺度数值模型，研究了注CO₂储集层适应性、CO₂空间运移规律、CO₂埋存类型、可动水对CS-EGR效果的影响及CS-EGR工程参数优化。结果表明：CS-EGR技术仅适用于Ⅰ类储集层，CO₂在Ⅱ类和Ⅲ类储集层中的注入效果较差；CO₂构造封存和束缚封存的占比之和为95.80%，而矿化封存的占比为0.15%；Ⅰ类储集层的CO₂最优注入速率为10 000 m³/d，CO₂突破时，CH₄累计产量为0.146×10⁸ m³，CO₂累计埋存量为0.794 × 10⁸ m³；可动水显著阻碍了CO₂运移，同时也增加了气井水淹风险。

关键词: 致密砂岩气藏, 孔喉结构, 气藏采收率, CO₂埋存, 敏感性分析

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

中图分类号:

TE357

姜艺, 杨胜来, 白浩言, 陈颖莉, 梅青燕, 王蓓东. 致密砂岩气藏CO₂埋存及提高CH₄采收率[J]. 新疆石油地质, 2025, 46(5): 591-599.

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.

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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

致密砂岩气藏CO₂埋存及提高CH₄采收率

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

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