Kinetic modeling of individual gaseous component formed from coal in a confined system

Under geological conditions, the modeled yield of methane increases with maturation (Ro). For heavy gaseous components (C2-5), the quantity remains steady at 1.2-1.6% Ro, then decreases at the post-mature stage (1.8-2.2% Ro). Gas dryness decreases with maturity increasing in the range of 0.6-1.0% Ro, then increases to 0.95 in the higher maturity range (2.2% Ro). Those data generally fit with the occurrence of gases from the humic organic matter in nature, indicating the applicability of this kinetic model in sedimentary basins for prediction of gas composition.