枯竭气藏盐膏岩盖层CO2封存密闭性评价研究

摘要/Abstract

摘要： 在全球碳中和战略的背景下,以CO₂为主的温室气体排放不断增加,对全球气候、生态系统和人类生活产生了不利影响。CO₂地质封存是实现碳中和目标的重要技术手段,而盖层作为潜在封存构造的封堵屏障,其密闭性是关乎CO₂长期甚至永久封存的关键。盐膏岩盖层具有低孔、低渗、稳定性好和高突破压力等优良特性,可作为CO₂长期安全封存的盖层。然而,盐膏岩盖层与其他岩性盖层的物化性质存在较大差异,导致盐膏岩盖层CO₂封存密闭性评价仍然面临挑战,亟须建立一种适用于盐膏岩盖层的CO₂封存密闭性评价方法。首先,基于层次分析法,综合考虑盖层宏观指标、微观指标和突破压力等关键盖层密闭性影响因素,建立了盐膏岩盖层CO₂封存密闭性评价指标体系,并划分了不同指标的4个优劣等级,得出各指标对盐膏岩盖层的密闭性影响权重。其次,结合模糊数学综合评价法,计算出盐膏岩盖层CO₂封存密闭性评价总权值,形成了一套适合盐膏岩盖层的CO₂封存密闭性综合评价方法。最终,以四川盆地高石梯—磨溪区块为例,系统评价了这一潜在枯竭气藏盐膏岩盖层的CO₂封存密闭能力,发现高石梯—磨溪构造气藏盖层密闭性评价总权值为[2.5,3.0）,评价等级为“较好”,具备较好的CO₂封存能力,适合未来开展CCS（碳捕集与封存技术）应用。研究成果可为盐膏岩盖层枯竭气藏CO₂埋存选址及封存安全评价提供一定的技术指导。

关键词: 四川盆地, 枯竭气藏, 盐膏岩盖层, CO₂封存, 密闭性评价

Abstract: In the context of the global carbon neutrality strategy, the continuous increase of greenhouse gas emissions, mainly CO₂, has adversely affected the global climate, ecosystem and human life. CO₂ geological storage is an important technical means to achieve the goal of carbon neutrality. As the sealing barrier of potential storage structure, the sealing property of caprock is the key to long-term or even permanent CO₂ storage. The salt-gypsum caprock has the excellent characteristics of "low porosity and low permeability", "good stability" and "high breakthrough pressure", which can be used as a caprock for long-term safe storage of CO₂. However, the physical and chemical properties of the salt-gypsum caprock are quite different from those of other lithological caprocks, which leads to the challenge of CO₂ storage sealing evaluation of salt-gypsum caprock. It is urgent to establish a CO₂ storage sealing evaluation method suitable for salt-gypsum caprock. Therefore, based on the Analytic Hierarchy Process (AHP), this paper comprehensively considers the key factors affecting the sealing performance of the caprock, such as the macro indicators, micro indicators and breakthrough pressure, and establishes the evaluation index system of CO₂ sealing performance of the salt-gypsum caprock, and divides the four advantages and disadvantages of different indicators, and obtains the influence weight of each index on the sealing performance of the salt-gypsum caprock. Secondly, combined with the comprehensive evaluation method of fuzzy mathematics, the total weight of CO₂ storage sealing evaluation of salt-gypsum caprock is calculated, and a comprehensive evaluation method of CO₂ storage sealing suitable for salt-gypsum caprock is formed. Finally, taking Gaoshiti Moxi block in Sichuan Basin as an example, the CO₂ storage and sealing ability of this potentially depleted gas reservoir caprock is systematically evaluated. It is found that the total weight of the seal evaluation of Gaoshiti Moxi structural gas reservoir caprock is [2.5,3.0], and the evaluation grade is "better", which has good CO₂ storage ability and is suitable for the application of CCS (carbon capture and storage) technology in the future. The research results of this paper can provide some technical guidance for CO₂ storage site selection and storage safety evaluation of the depleted gas reservoir caprock.

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

中图分类号:

TE34

蒋贝贝,刘佳波,张国强,等. 枯竭气藏盐膏岩盖层CO₂封存密闭性评价研究[J]. 油气藏评价与开发, 2025, (): 1-.

JIANG BEIBEI,LIU JIABO,ZHANG GUOQIANG, et al. Research on the Sealing Performance Evaluation of CO₂ Storage in Depleted Gas Reservoirs with salt-gypsum caprocks[J]. Petroleum Reservoir Evaluation and Development, 2025, (): 1-.

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枯竭气藏盐膏岩盖层CO₂封存密闭性评价研究

Research on the Sealing Performance Evaluation of CO₂ Storage in Depleted Gas Reservoirs with salt-gypsum caprocks

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