为揭示淮南地区页岩CO₂吸附行为的关键控制因素，选取八里塘下石盒子组与山西组5个页岩样品，系统开展CO₂等温吸附实验，采用优化Langmuir模型、双参数DBET（Brunner-Emmett-Teller）模型及DA（Dubinin-Astakhov）模型分析页岩中CO₂的吸附机制，结合总有机碳（total organic carbon, TOC）、压汞孔隙、矿物组成等物性测试探讨了页岩中CO₂吸附的影响因素。结果表明：页岩中CO₂吸附的过剩吸附量随压力升高呈先增后降再稳定的趋势，绝对吸附量则持续上升至吸附饱和；过剩吸附量优化后的Langmuir与DA模型拟合度显著优于DBET模型，绝对吸附量优化后的Langmuir模型更适合对其进行描述，CO₂吸附相密度拟合结果表明CO₂吸附呈现单分子层与微孔填充吸附共存的复合机制；CO₂理论吸附量与孔隙度、微孔、中孔体积、TOC及黏土矿物含量呈正相关，与长石矿物含量呈显著负相关，与石英含量不相关。研究成果为淮南地区页岩CO₂封存潜力评估及工程参数优化提供了理论依据。

To uncover the key factors controlling shale CO₂ adsorption in the Huainan area, eight shale samples from the Lower Shihezi and Shanxi Formations in Bailitang were selected, and systematic CO₂ adsorption isotherm experiments were carried out. The adsorption mechanism was analyzed using the optimized Langmuir, Two-parameter Brunner-Emmett-Teller (DBET), and Dubinin-Astakhov(DA) models. The influencing factors were explored by total organic carbon (TOC), mercury porosimetry porosity, and mineral composition tests. Results show that shale CO₂ excess adsorption capacity first increases, then decreases, and finally stabilizes with pressure rise, while absolute adsorption capacity keeps rising to saturation. The optimized Langmuir and DA models fit excess adsorption better than the DBET model, and the optimized Langmuir model is more suitable for absolute adsorption. CO₂ adsorption phase density fitting shows a composite mechanism of monolayer and micropore filling adsorption. The theoretical CO₂ adsorption capacity is positively correlated with porosity, micropore volume, TOC, and clay mineral content, negatively correlated with feldspar content, and unrelated to quartz content. The research results provide a theoretical basis for evaluating the potential ofshale CO₂ storage and optimizing engineering parameters in the Huainan area.