Development of shale gas exploration and recovery processes have become the research focus of the scientific and industrial communities due to the acute depletion of conventional energy sources and the ever-increasing demand for cleaner fuel. Shale reservoirs are considered one of the best unconventional energy sources due to their predominant global availability and CH₄ extraction in almost pure form. CO₂ can be successfully sequestered into the shale formations because of the inherent high affinity of shale towards CO₂, which helps in enhanced gas recovery from the unmineable deep reservoirs. Adsorption is the primary mechanism of gas storage in shale formations. This article reviews the gas adsorption mechanism, sorption isotherms, classifications, and measurement techniques with shale as a porous adsorbent. The critical findings of previous investigations on the adsorption behaviour of CH₄ and CO₂ on shale are presented comprehensively. Shale inherently prefers CO₂ adsorption to CH₄. The influence of organic and inorganic contents, organic matter type, thermal maturity, moisture content, permeability, pore size, shape, distributions, and connectivity on gas adsorption is also discussed.

由于传统能源的严重枯竭和对清洁燃料的需求不断增长，页岩气勘探和开采过程的开发已成为科学界和工业界的研究重点。页岩储层被认为是最好的非常规能源之一，因为它们在全球范围内占主导地位，而且 CH ₄以几乎纯的形式提取。_{由于页岩对 CO 2}固有的高亲和力， CO ₂可以成功地封存到页岩地层中，这有助于提高无法开采的深层储层的天然气采收率。吸附是页岩地层储气的主要机制。本文回顾了页岩作为多孔吸附剂的气体吸附机理、吸附等温线、分类和测量技术。_{全面介绍了先前关于 CH 4}和 CO ₂在页岩上的吸附行为研究的重要发现。页岩固有地更喜欢CO ₂吸附而不是CH ₄。还讨论了有机和无机含量、有机质类型、热成熟度、水分含量、渗透性、孔径、形状、分布和连通性对气体吸附的影响。