The study looked at how coal reservoirs in a specific area affect the amount of coalbed methane that can be extracted. They found that factors like the type of coal, gas content, porosity, and structure of the coal all play a role in how much methane can be stored. Higher porosity and well-structured coal lead to better methane storage, while high ash content reduces storage capacity. Additionally, as coal rank increases, methane storage capacity initially goes up before eventually decreasing.