Abstract
Coal reservoir system is the key factors influencing the permeability of coal seam, the study of the development extent of the fracture is very beneficial for the large-scale commercial exploitation of coalbed methane. From the metamorphic degree of coal rock, maceral, coal characteristics and mineral filling these aspects ,this article discusses the control mechanism of the fracture system development. It is pointed out that the development degree of system is the direct factors influencing the coal reservoir permeability and fracture system development is influenced by many factors. The fillings in crack can block the fracture and reduce the permeability of coal reservoirs.
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