Adsorption characteristics of CH4 and CO2 in shale under conventional and stressed conditions: a comparative study of powdered and cylindrical samples

IF 3.3 4区工程技术 Q3 CHEMISTRY, PHYSICAL

Adsorption Pub Date : 2026-10-15 DOI:10.1007/s10450-026-00715-x

Xi Wang, Chao Qin, Yuanlong Wei, Yongdong Jiang, Shiwan Chen, Zaomin Shu

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引用次数: 0

Abstract

The confining pressure of overlying strata can seriously affect the adsorption behavior of shale on CH₄ and CO₂. To address this issue, the Isothermal adsorption experiments of CH₄ and CO₂ on shale were conducted under unstressed (powdered sample, 0 MPa) and stressed (cylindrical sample, 21 MPa) conditions, and the micropore structure was characterized using scanning electron microscopy (SEM), low-temperature CO₂/N₂ adsorption, and nuclear magnetic resonance (NMR). Results indicate that the adsorption capacity of shale to CH₄ and CO₂ under stress is significantly lower than that under non-stress conditions, while the adsorption equilibrium time of shale to gas is longer than that under non-stress. In addition, the Dubinin-Radushkevich-Langmuir (DR-L) model was employed to describe the adsorption behavior of CH₄ and CO₂ in nanopores of different scales, and the fitting results reveal that the stress can lead to the existence of gas molecules in shale more inclined to exist in the form of micropore filling. Especially, the adsorption capacity difference between powdered and cylindrical shales a non-monotonic trend with a peak near the critical pressure, attributed to the progressive reopening of compressed adsorption sites as effective stress diminishes and to enhanced supercritical gas diffusivity. This study provides theoretical support for efficient shale gas extraction and CO₂ geological storage.

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常规和应力条件下页岩对CH4和CO2的吸附特性：粉状和圆柱形样品的对比研究

覆岩围压会严重影响页岩对CH4和CO2的吸附行为。针对这一问题，分别在无应力（粉末状样品，0 MPa）和应力（圆柱形样品，21 MPa）条件下，对页岩上CH4和CO2进行等温吸附实验，并利用扫描电镜（SEM）、低温CO2/N2吸附和核磁共振（NMR）对微孔结构进行表征。结果表明，应力条件下页岩对CH4和CO2的吸附量明显低于无应力条件下，页岩对气体的吸附平衡时间比无应力条件下更长。此外，采用Dubinin-Radushkevich-Langmuir （DR-L）模型描述了CH4和CO2在不同尺度纳米孔中的吸附行为，拟合结果表明，应力会导致页岩中气体分子更倾向于以微孔填充的形式存在。粉状页岩和柱状页岩的吸附能力差异呈非单调趋势，在临界压力附近达到峰值，这是由于有效应力减小时压缩吸附部位逐渐重新打开以及超临界气体扩散系数增强所致。该研究为页岩气高效开采和CO2地质封存提供了理论支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Adsorption 工程技术-工程：化工

CiteScore

8.10

自引率

3.00%

发文量

审稿时长

2.4 months

期刊介绍： The journal Adsorption provides authoritative information on adsorption and allied fields to scientists, engineers, and technologists throughout the world. The information takes the form of peer-reviewed articles, R&D notes, topical review papers, tutorial papers, book reviews, meeting announcements, and news. Coverage includes fundamental and practical aspects of adsorption: mathematics, thermodynamics, chemistry, and physics, as well as processes, applications, models engineering, and equipment design. Among the topics are Adsorbents: new materials, new synthesis techniques, characterization of structure and properties, and applications; Equilibria: novel theories or semi-empirical models, experimental data, and new measurement methods; Kinetics: new models, experimental data, and measurement methods. Processes: chemical, biochemical, environmental, and other applications, purification or bulk separation, fixed bed or moving bed systems, simulations, experiments, and design procedures.