Abstract
The enrichment of deep coalbed methane (CBM) in the Jiaxian block of the Ordos Basin is strongly influenced by the sealing capacity of coal seam roofs and floors, which play a pivotal role in CBM preservation under conditions of high temperature and pressure. Despite its importance, the mechanisms underlying the sealing capacity remain poorly understood, and their quantitative evaluation is rarely explored. This study starts from the influence of gas transport channels, and summarizes the key factors that affect sealing capability. And it addresses these gaps by integrating experimental methods, advanced 3D seismic attribute analysis, and multi-source data fusion to construct a comprehensive model for evaluating roof and floor sealing capacity. Our findings reveal that five key factors-mud content, mudstone-to-formation ratio, porosity, permeability, and fracture development intensity-control the sealing capacity of the roof and floor. Focusing on the No. 8 coal seam, we developed a novel methodology to predict porosity and permeability by differentiating rock types, coupled with fracture intensity prediction using optimized seismic attributes and grayscale calculations. The results provide crucial insights into the enrichment patterns of deep CBM, offering a novel framework for optimizing exploration strategies in the Ordos Basin and beyond.