Study on prediction and major control factors of coalbed methane enrichment zone in Zhundong Area

In order to predict the coalbed methane enrichment favorable zone in Zhundong Area, based on the previous investigation,in combination with the lithotype a nd coal quality and adsorption capacity test,a study was conducted on the gas bearing under the control of the coalbed methane enrichment factors,front area of Bogeda M ountain of Zhundong coalbed methane enrichment zone,Jimusaer Depression and Wutongwozi Depression. The front area of Bogeda Mountain was the first selected target zone. The results showed that the front area of Bogeda Mountain had good coalbed methane formation condition,the gas bearing was obvious,the buried depth was moder ate,the seam layout condition was good and the accumulated thickness was high. The seam was medium and high volatile,low moisture content and low ash quality coal. T he coal and rock adsorption capacity was high. The main control factors of the coalbed methane enrichment in Zhundong Area were that the lithotype and coal quality and air oxidized zone depth,coal and rock adsorption capacity and coal grade ,vitrinite content would be in a positive correlation,would be in a negative correlation to the inertini te and moisture content and the ftting optimized was high. The features of the air oxidized zone distributed in Zhundong Area would be deep in north and shallow in south. The seam in the front area of Bogeda Mountain generally would be deeper than floor line of the air oxidized zone.