页岩有机质微纳米限域空间内甲烷吸附行为研究——以龙马溪组页岩为例OA

To address the issue that methane multi-component adsorption behavior in shale micro-nano confined spaces is difficult to clarify,this study conducted methane adsorption experiment on 9 groups of shale kerogen samples from the Longmaxi Formation in the Sichuan Basin,and analyzed the meth-ane adsorption behavior in the confined spaces of micro-nano pores using an improved Ono-Kondo model.Results show that the improved Ono-Kondo model is more suitable for the characterization of methane adsorption behavior in shale kerogen.Methane is adsorbed in the nanopore by surface adsorp-tion and pore-filling adsorption,and the adsorbed methane in the form of pore-filling contributes sig-nificantly to the total methane adsorption amount.The surface adsorption behavior of methane mainly occurs in the mesopores,and its adsorption capacity increases with increasing mesopore volume.In contrast,the pore-filling adsorption mainly occurs in the micropores,and its adsorption capacity in-creases logarithmically with increasing micropore volume(<2 nm).