The experimential expressions of T-t-R

o

m

( Wu Chonglong

1991)

which were established with double regression method

can not only predigest the Bostick(1979) chart

but also can be taken as statistic expressoin of Arrhenius equation on coal metamorphism. Both the experimential expressions and the Bostick chart can't directly describe multiple them-tat source and multiple stage superimposed metamorphism of organic matter and coal. In order to solve this problem

a new dynamic simulation method for organic matter maturity is proposed in this paper by taking the experimential formulation as a base and using differential method of integral calculus. This method can be used to simulate dynamic coupling organic matter maturation and coal metamorphism under different thermal conditions and its development process.