Enrichment Deposit and Control Factors of Coal Bed Methane in Kaiping Coalfield

Based on the structure evolution background of the Kaiping Coalfield and the study results of the CBM exploration, the paper had a coal bed a study on methane evolution process from a generation, storage, migration to accumulation.The study results showed that at different structure location of the Kaiping Coalfield, d ue to the coal measures deposit conditions and the influence of the later structure movement reconstruction, the enrichment deposit mode of the coal bed method woul d be different and there were three type modes mainly.They were W type in Tangshan Mine, ladder type in Lujiatuo Mine and V type in Donghuantuo Mine.Due to the co ntrol by the different deposit modes, the CBM content and pressure distribution would be obviously different and the tendency would be west high and east low generall y.The gas pressure in the south-east wing of Kaiping syncline was low generally and the mines there would be low gassy mine in all.The gas pressure in the north-west wing would be high generally and there were two high outburst mines and one high gassy mine.