Coal and its potential

Coal seam gas is in practice the same as natural gas from oil/gas fields. Same in a chemical sense (CH4) and same in terms of its value as an energy source.

Only thing it lacks is that it doesn’t have the liquids content (propane, butane, ethane, condensate) that gas from a conventional gas field typically contains. Those liquids are normally extracted (less common with ethane) for separate marketing and statistically are included as “oil” not “gas”.

One liquid that coal seam does produce is water (usually). Depending on the location, this is either a nuisance or a valuable commodity in its own right. It’s real water just like rain or from a river thus useful for agriculture, industry etc.