Through the analysis of accumulation unit of coalbed methane in Qinshui Basin, it is shown that the classification of the coalbed methane accumulation units requires all the geological factors influencing the coalbed methane reservoiring to be found out.

The concentration dissipation history of coal bed methane (CBM) in the middle southern Qinshui Basin was quantitatively simulated.

Based on the principle of grey association analysis,the present paper has put forward a fairly practical and readily programmed cluster method—grey association cluster method,and employed this method to demarcate coal beds and gas beds,discriminate between coal-produced gas bed,oil bed and water bed ,and make lithostratigraphic classification.

The controlled roles of coal－ accumulation by paleostructure and paleogeography and sedimentary environment have been explained, through analysis and study of Late Paleozoic coal－ bearing strata in Ningxia Region.