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Journal of Geological Research
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Special Issues
Journal of Geological Research
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2012
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Article
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Fig 3
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Research Article
Characterization of Coal Reservoirs in Two Major Coal Fields in Northern China: Implications for Coalbed Methane Development
Figure 3
Porosity and mercury injection curves of different metamorphic-deformational coals in study area.
(a)
type I coal reservoir 
(b)
type II coal reservoir
(c)
type III coal reservoir
(d)
type IV coal reservoir
(e)
type V coal reservoir