In this article, a new approach is proposed to investigate adsorption kinetics and transport of gases in shale. Due to co-existence of pores with different size in the shale, a set of adsorption processes happened in pores of different sizes are considered. A first-order multi-process model is developed, which can perfectly fit the adsorption kinetic data of CH₄ and CO₂ obtained at different temperatures. The modeling and pore characterization results indicate that an adsorption process happens in micropores/mesopores (<50 nm) and another adsorption process happens in macropores (>50 nm) in the Wufeng shale. Gas diffusion mechanism is dominant in micropores/mesopores, and gas seepage mechanism is dominant in macropores. The effective diffusivity of CO₂ is smaller than that of CH₄, because the adsorption of large amount of CO₂ in the pores hinders its diffusion. The coefficients related to the diffusion and seepage have no obvious trend with temperature.

中文翻译：

---

一种模拟页岩中甲烷和二氧化碳的吸附动力学和迁移的新方法

在本文中，提出了一种研究页岩中气体的吸附动力学和传输的新方法。由于页岩中不同大小的孔隙共存，因此考虑了在不同大小的孔隙中发生了一组吸附过程。建立了一阶多过程模型，可以完美拟合不同温度下获得的CH ₄和CO _{2的吸附动力学数据。}建模和孔隙表征结果表明，五峰页岩在微孔/中孔（<50 nm）中发生吸附过程，在大孔（>50 nm）中发生吸附过程。微孔/中孔以气体扩散机制为主，大孔以气体渗流机制为主。_{CO 2}的有效扩散率小于CH ₄，因为大量CO ₂在孔中的吸附阻碍了其扩散。与扩散和渗流相关的系数随温度变化趋势不明显。