To compare the pore structure, mechanical and CO₂ adsorption properties of coal and shale, a series of experiments were carried out using nuclear magnetic resonance (NMR), uniaxial compression, Brazilian splitting, and high-pressure CO₂ adsorption. The results show that the total porosity of coal is 7.51 times that of shale, and shale is dominated by adsorption pores, while adsorption pores and seepage pores in coal are equally important. Moreover, it is found that the micropores in shale are more advantageous, while meso-macropore in coal are more significant. The adsorption pore surface of coal is rougher than that of shale, and the seepage pore structure of shale is more complex. The uniaxial compressive strength, elastic modulus and absorption energy of shale are 2.01 times, 2.85 times, and 1.27 times that of coal, respectively, indicating that shale has higher compressive capacity and resistance to elastic deformation than coal. The average tensile strength, Brazilian splitting modulus, absorbed energy and brittleness index of shale are 7.92 times, 6.68 times, 10.78 times, and 4.37 times that of coal, respectively, indicating that shale has higher tensile strength and brittleness, but lower ductility, compared with coal. The performed analyses show that under the same conditions, the CO₂ adsorption capacity of coal is greater than that of shale. The present article can provide a theoretical basis to implement CO₂-enhanced coalbed methane (CBM)/shale gas extraction.

为了比较煤和页岩的孔隙结构、力学和CO ₂吸附性能，利用核磁共振（NMR）、单轴压缩、巴西劈裂和高压CO _{2进行了一系列实验。}吸附。结果表明，煤的总孔隙度是页岩的7.51倍，页岩以吸附孔为主，而煤中的吸附孔和渗流孔同样重要。此外，还发现页岩中的微孔隙更具优势，而煤中的介-大孔隙更为显着。煤的吸附孔隙表面比页岩更粗糙，页岩的渗流孔隙结构也更复杂。页岩的单轴抗压强度、弹性模量和吸收能分别是煤的2.01倍、2.85倍和1.27倍，表明页岩比煤具有更高的抗压能力和抗弹性变形能力。页岩的平均抗拉强度、巴西劈裂模量、吸收能、脆性指数分别为7.92倍、6.68倍、10.78倍，分别是煤的 4.37 倍，表明与煤相比，页岩具有较高的抗拉强度和脆性，但延展性较低。分析表明，在相同条件下，CO₂煤的吸附能力大于页岩。本文可为实施CO ₂强化煤层气/页岩气开采提供理论依据。