多热源叠加的岩层有机质成熟度动态模拟方法

A DYNAMIC SIMULATION METHOD FOR MATURITY OF ORGANIC MATTER IN SUPERPOSED ROCKS OF MULTIPLE THERMAL SOURCES

Ｔ－ｔ－Ｒｏ，ｍ经验公式仅适用于单一热源条件下的岩层有机质成熟度模拟。对于多热源多阶段叠加变质作用的岩层有机质，其成熟度模拟可采用微积分学中的微元法思想，以Ｔ－ｔ－Ｒｏ，ｍ经验公式为基础，求出给定时间段内的镜质组反射率的增量（△Ｒ），即可逐段模拟不同温度条件的镜质组反射率。镜质组反射率增量不仅与受热温度、时间有关，而且还受某一时刻镜质体反射率大小的影响。利用该方法对抚顺盆地的煤层进行了模拟，其结果与实际情况相符。

The experimential expressions of T-t-R0 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.