Original ResearchPublished 30 September 2026Study on the pore-fracture system of low-rank coalbed methane reservoirs in the Bayanhua Sag, Erlian BasinQin Meng · Ling Li · Haipeng Yao · Xiaohu Bai · Haitao Lin · Wei He · Dongxu YangFrontiers in Earth Sciencedoi 10.3389/feart.2026.1901191