Genesis and Accumulation Modes of Coalbed Methane at the Eastern Margin of Ordos Basin, China: Evidence from Its Geochemistry.

For example, gas contents of coal seams with a lower coal rank in the northern parts (Junger, Hequ, and Baode blocks) show an increasing trend followed by a decrease with increasing depth and reach peak value at ∼700–800 m ( Figure 3 a).

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