Coalbed methane migration law of No.13 Mine in Pingdingshan Mining Area under tectonic control

Based on the coalbed methane geological theory and the tectonic gradual control theory,a local tectonic of Pingdingshan Mining Area was selected as a study object and the calbed methane deposition features and migration law under the certain fectonic control were analyzed. The study showed that the deep depth fault would have an obvious role to release the syneline tectonic stress,thestress status of the faut surface determined the local stress concentration degree,and the c rtical desorption pressure of the reservoir gas and the underground water condition restricted the coalbed methane deposition status and migration capacity. The analysis on the yield of some coalbed methane wells in No.13 Mine of Pingdingshan Mining area showed that when the tectonic closed coefficient lf 4.5,the pressure gradient of reservoir would be high.,the local permeability would be low,but the coalbed methane drainage yield would be high. In the crack developed zone along the major stress direction,the difference between the reservoir permeability would be high and the migration capacity was contrlled by coalbed methane depostion status of the reservoir.Under the tectonic complex role,the closed capacity of the reservoir determined the resources abundance and the migration law ofthe regional coalbed methane.