The forming of coaled methane reservoirs correlate with the self conditions of coal beds, and more important with the later preservation conditions among which
the tectonic evolution and hydrodynamic condition are the key geological factors. The accumulation and enrichment is quite different in coal beds even with the
same buried depth if they had experienced different tectonic evolution process including the beginning and lasting time, and the intensity of reversing and upl
ifting. The CBM constantly dissipates in the area of chronically uplifting and denudation. The subsidence in the area is advantageous to the preservation of CBM
, but also can lead to the reduction of CBM saturation. The flowing ground water affects coalbed gas content and geochemical characteristics obviously. In both
horizontal and vertical plane, the coal has a lower gas content and a lithter carbon isotope of coalbed methane in the area of stronger hydrodynamics.
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