The effective prediction of high production areas of CBM is of great significance to improve the production and the development benefits of single wells.In order to the evaluate the production capacity of CBM formation quantitatively

based on the development mechanism of CBM

the data of CBM in southern Qinshui Basin was used to define the absorption efficiency index and

the gas production capacity index through the theory and statistical analysis.And the reliability of gas production capacity was quantitatively evaluated from 3 aspects of gas content ability

desorption efficiency and output capacity of the reservoir.The results showed that

in the evaluation of gas content

to remove gas saturation and increase the differential pressure of formation pressure and desorption pressure—which represented the macroscopic desorption efficiency—in the desorption efficiency index can greatly improve the correlation between daily gas production and gas content

desorption efficiency index respectively.The daily gas production increased with the increasing of gas bearing index

desorption efficiency index and the production capacity index.When the gas content

the desorption efficiency index and the permeability were respectively higher than 15 m

3

/t

0.11（MPa·d）

-1

and 0.03×10

-3

μm

2

the daily gas production could be more than 800 m

3

.When the gas content

desorption efficiency index and production capacity index were defined as the gas production capacity index of CBM

high production areas of CBM could be effectively predicted.When the gas production capacity index was great than 0.05×10

-3

μm

2

·m

3

·（t·d·MPa）

-1

the daily gas production was more than800 m

3

while the index was greater than 1×10

-3

μm

2

·m

3

·（t·d·MPa）

-1

the daily gas production was more than 1 500 m

3

.