It is traditionally assumed that the Coal Bed Gas (CBG) formation is the effect of thermolysis (cracking) of the bulk coal organic matter by stratum temperature/pressure or animalcule.

• 传统煤化作用理论认为，煤层气生成是煤中有机质在地层温度/压力或微生物作用下发生降解或裂解的结果，近年来国内外相关研究成果却对这一传统理论提出了重大质疑。