为实现页岩中吸附气含量的快速评价，以中国典型海相页岩（川南龙马溪组）和海陆过渡相页岩（鄂尔多斯盆地东缘山西组）为例，通过系统的总有机碳含量（total organic carbon, TOC）、全岩-黏土X射线衍射（X-ray diffraction, XRD）、低温低压气体吸附和甲烷等温吸附实验，建立了页岩三层甲烷等温吸附岩石物理模型，揭示了不同页岩组分对甲烷吸附的控制机制。研究结果表明：海相页岩和海陆过渡相页岩TOC均为甲烷吸附的主控因素，但海相页岩脆性矿物吸附力强于黏土矿物，而海陆过渡相页岩则黏土矿物吸附能力强于脆性矿物；海相页岩和海陆过渡相页岩孔隙结构存在明显差异：海相页岩有机质同时发育微孔和介孔，兼具有吸附／游离气赋存功能，海陆过渡相页岩有机质发育微孔为主，主要影响吸附气的赋存；矿物的成因与比表面积差异主导吸附能力分异，海相页岩有机成因石英与低比表面积伊利石组合，促使脆性矿物吸附优势，而海陆过渡相页岩脆性矿物以陆源碎屑石英为主，孔隙发育能力弱，黏土矿物以高比表面积伊蒙混层和高岭石为主，导致黏土矿物吸附能力高于脆性矿物；建立的吸附气模型可实现页岩气甜点段快速评价，为页岩气勘探开发提供理论支撑。

To achieve rapid evaluation of adsorbed gas content in shale, typical marine shale (Longmaxi Formation in southern Sichuan) and the transitional shale (Shanxi Formation in the eastern margin of the Ordos Basin) in China were taken as examples. Through systematic TOC (total organic carbon content) measurements, XRD (X-ray diffraction), low-pressure and low-temperature gas adsorption and methane isothermal adsorption experiments, a three-layer methane isothermal adsorption petrophysical model for shale gas was established to elucidate the control mechanisms of different shale components on methane adsorption. The key findings are as follows. TOC is the primary control on methane adsorption in both marine and transitional shales. However, brittle minerals exhibit higher adsorption capacity than clay minerals in marine shale, whereas clay minerals dominate in transitional shale. Pore structure heterogeneity exists between marine and transitional shales. Organic matter in marine shale develops both micropores and mesopores, serving as storage space for both free and adsorbed gas. In contrast, organic matter in transitional shale primarily develops micropores, predominantly influencing adsorbed gas storage. Adsorption divergence is governed by mineral origin and specific surface area differences. Marine shale contains organic-derived quartz and low specific surface area illite, favoring brittle mineral adsorption. Transitional shale comprises detrital quartz with limited pore development capacity and clay minerals dominated by high specific surface area illite/smectite mixed-layer and kaolinite, leading to superior clay mineral adsorption. The established adsorbed gas content model enables rapid evaluation of shale gas sweet spots, providing a theoretical foundation for optimizing exploration and development of shale gas.