Simulation experiment of coalification is carried out by the authors with Tertiary brown coal samples collected from Huangxian County

Shandong Province and Xindian County

Yunnan Province.In the end of different coalification stages

the average accumulative values of generated gaseous hydrocarbon corres-poding to each ton of residual coal are as follows:20m

3

in fat and gas coal stages(R

m

=0.95%)

105m

3

in lean coal stage(R

m

=2.0%)and 398m

3

in an-thracite stage(R

m

=4.0%).As the coalification goes on

the δ

13

C of methane and the content of CO increase continuously

but CO

2

decreases instead.