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The secondary biogenic coalbed gas, a new genetic and energy source type of coalbed gas in China, has been found in Xinji, Liyazhuang and Enhong areas. The essential characteristics of this type of gas are: (i) the major component of the gas is methane, with C1/C1–5 value higher than 0.99, indicating that the gas is part of dry gas; (ii) the δ13C1 value is in the range of −61.7‰ to −47.9‰, mostly...
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