枯竭气藏盐膏岩盖层CO2封存密闭性评价研究

doi:10.13809/j.cnki.cn32-1825/te.2025.04.014

Abstract

Abstract:

In the context of the global carbon neutrality strategy, greenhouse gas emissions —mainly CO_₂— are continuously rising, exerting adverse effects on the global climate, ecosystems, and human life. Geological storage of CO₂ is an important technological approach to achieving carbon neutrality targets. As sealing barriers within potential storage formations, the sealing property of caprocks is crucial for the long-term or even permanent CO₂ storage. Salt-gypsum caprocks exhibit favorable properties such as low porosity, low permeability, high structural stability, and high breakthrough pressure, making them promising candidates for long-term and secure CO₂ storage. However, their physicochemical characteristics differ significantly from those of other lithological caprocks, posing challenges to evaluating their sealing performance for CO₂ storage. Therefore, there is an urgent need to establish an evaluation method tailored to salt-gypsum caprocks. Firstly, based on the Analytic Hierarchy Process (AHP), a comprehensive evaluation index system was developed by considering key influencing factors, such as macro indicators, micro indicators, and breakthrough pressure, affecting the sealing performance of caprocks. Four grading levels were defined for each index, and the influence weight of each index on the sealing performance of salt-gypsum caprocks was determined. Secondly, by integrating the Fuzzy Comprehensive Evaluation Method, the total weight for evaluating the sealing performance of salt-gypsum caprocks for CO₂ storage was calculated. This resulted in the development of a comprehensive evaluation method of CO₂ storage sealing tailored to these types of caprocks. Finally, the method was applied to the Gaoshiti-Moxi block in the Sichuan Basin as a case study, where the CO₂ storage sealing performance of its potential salt-gypsum caprock in a depleted gas reservoir was systematically evaluated. The results revealed that the total weight of the sealing performance evaluation of Gaoshiti-Moxi structural gas reservoir caprocks ranged from [2.5,3.0), corresponding to a grade of “relatively good”, indicating a relatively strong capacity for CO₂ storage. This suggested the site was suitable for the future application of Carbon Capture and Storage (CCS) technology. The research results can provide technical guidance for site selection and storage safety evaluation of CO₂ storage in depleted gas reservoirs with salt-gypsum caprocks.

Key words: Sichuan Basin, depleted gas reservoir, salt-gypsum caprocks, CO₂ storage, sealing performance evaluation

CLC Number:

TE34

JIANG Beibei,LIU Jiabo,ZHANG Guoqiang, et al. Research on sealing performance evaluation of CO₂ storage in salt-gypsum caprocks of depleted gas reservoirs[J]. Petroleum Reservoir Evaluation and Development, 2025, 15(4): 646-655.

Figures/Tables 12

Fig.1

Fig.2

Table 1

Table 2

Table 3

Fig.3

Table 4

Table 5

Comprehensive evaluation criteria for caprock sealing capacity"

评价集 $V$	$C 1$					$C 2$			$C 3$	$C 4$
评价集 $V$	埋深/km	厚度/m	连续性/km²	岩性	塑性系数	中值半径/nm	扩散系数/（cm²/s）	比表面积/（m²/g）	突破压力/MPa	孔隙度/%	渗透率/10^-3μm²
好	≥2.0	≥200	≥30	盐岩	≥6	<2	<10^-9	15~<30	≥15	<2	<10^-4
较好	1.5~<2.0	150~<200	25~<30	盐膏岩	4~<5	2~<4	10^-9~<10^-8	30~<40	12~<15	2~<5	10^-4~<10^-3
中等	1.0~<1.5	100~<150	20~<25	泥岩/页岩	3~<4	4~<8	10^-8~<10^-7	40~<60	10~<12	5~<8	10^-3~<10^-2
差	<1.0	<100	<20	砂岩	<3	≥8	≥10^-7	≥60	<10	≥8	≥10^-2
准则层权重系数	0.112					0.112			0.351	0.425
评价层权重系数	0.307	0.307	0.203	0.114	0.069	0.333	0.333	0.333	1.000	0.250	0.750

Table 5

Table 6

Fig.4

Fig.5

Fig.6

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岩性		塑性系数	孔隙度/%	渗透率/10^-3μm²	突破压力/MPa	弹性模量/10⁴ MPa	泊松比
盐-膏岩	盐岩	2.00~2.17	<3.0	<10^-4	>20.0	0.5~1.0	0.20~0.44
盐-膏岩	膏岩	2.00~2.17	2.0~8.0	10^-4~10^-3	5.0~10.0	1.5~4.0	0.20~0.45
泥岩		1.31~1.42	1.0~10.0	10^-8~10^-2	6.0~15.0	2.0~5.0	0.25~0.35
页岩		0.10~0.50	1.0~10.0	10^-9~10^-5	0.9~40.0	1.5~2.5	0.10~0.35
砂岩		0.20~0.40	1.6~28.0	1~10³	5.0~41.0	3.3~7.8	0.30~0.35

优势	封存作用
膏岩和盐岩通常以互层状产生，盐岩还具有地下流动性	可以愈合膏岩中的裂缝
深部盐膏层受到高温和较大应力作用时会发生蠕变^[18]，且塑性系数介于2.0~2.2，高出泥岩约1.53倍^[19]	构造挤压下盐膏岩盖层的密闭性能会随埋深而演化
盐膏岩具有更低的孔隙度，且盐膏岩孔隙度通常小于1%	抗剪切能力更强，不易产生断层和微裂缝^[20]

一级指标	二级指标	选取原因
宏观指标	CO₂埋深	①埋深反映盖层所处地质力学状态、岩石成岩程度和沉积环境^[20] ②盖层厚度越大说明其盖层横向展布范围越大、沉积环境越稳定 ③盖层连续性指不透水岩层（如页岩、盐岩、致密灰岩）在空间上的完整性和横向延展性是阻止CO₂垂向迁移的关键屏障 ④盖层岩性是评估CO₂封存场地可行性和长期安全性的关键因素，岩性越好，盖层密闭能力越强 ⑤塑性系数越大，岩石塑性变形能力越强
	盖层厚度
	盖层连续性
	盖层岩性
	塑性系数
微观指标	中值半径	①中值半径可提供关于盖层孔隙的平均大小信息，并间接反映盖层的渗透性 ②扩散系数是盖层结构致密性、微孔隙发育状况和密闭性的重要指标 ③比表面积是岩石颗粒大小、孔隙发育程度、压实与胶结程度的综合表现
	扩散系数
	比表面积
突破压力	突破压力	突破压力越大，则密闭性能越好^[22]
孔-渗指标	孔隙度	可衡量盖层岩石孔隙空间体积和CO₂气体在盖层中的流通能力^[23]
孔-渗指标	渗透率	可衡量盖层岩石孔隙空间体积和CO₂气体在盖层中的流通能力^[23]

指标 C_i : C_j	关系及a_ij	指标 C_i : C_j	关系及a_ij	指标 C_i : C_j	关系及a_ij	指标 C_i : C_j	关系及a_ij
C₁: C₁	同等 1	C₁: C₂	同等 1	C₁: C₃	强弱 1/4	C₁: C₄	较弱 1/3
C₂: C₁	同等 1	C₂: C₂	同等 1	C₂: C₃	强弱 1/4	C₂: C₄	较弱 1/3
C₃: C₁	强重 4	C₃: C₂	强重 4	C₃: C₃	同等 1	C₃: C₄	稍弱 1/2
C₄: C₁	较重 3	C₄: C₂	较重 3	C₄: C₃	稍重 2	C₄: C₄	同等 1

井号	层位	孔隙度/%	渗透率/10^-5μm²	中值半径/nm
高石11	龙王庙组	1.20	1.30	18.70
磨溪9-1	筇竹寺组	0.83	0.30	1.55
磨溪9-2	筇竹寺组	0.77	0.28	1.99
磨溪9-3	筇竹寺组	1.13	0.33	1.32
磨溪9-4	筇竹寺组	0.45	0.15	0.99

Research on sealing performance evaluation of CO₂ storage in salt-gypsum caprocks of depleted gas reservoirs

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Research on sealing performance evaluation of CO2 storage in salt-gypsum caprocks of depleted gas reservoirs

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Research on sealing performance evaluation of CO₂ storage in salt-gypsum caprocks of depleted gas reservoirs