The study looked at how stress affects the permeability of high-rank coal reservoirs in the Ordos Basin. They found that as stress increases, permeability decreases in a specific pattern. When stress is low, permeability drops quickly, but the decline slows down as stress increases. The researchers also compared their findings to another coal basin and found differences in stress sensitivity. The decrease in permeability is due to fractures in the coal closing up under pressure. To prevent this stress sensitivity and improve coal recovery, controlling production rates early on is important.