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Secondary biogenic coalbed gas in some coal fields of China

机译：中国某些煤田的二次生源煤层气

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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 C_1/C_(1-5) value higher than 0.99, indicating that the gas is part of dry gas; (ⅱ) the δ~(13)C_1 value is in the range of -61.7 per thousand to -47.9 per thousand, mostly lower than -55 per thousand, which is much lower than the estimated δ~(13)C_1 value of thermogenic methane according to the thermal evolution degree of the coal rocks (with R_o value from 0.87% to 1.43%), showing the characteristics of the secondary biogenic gas; (ⅲ) the δD value of methane ranges from -244 per thousand to -196 per thousand; (ⅳ) δ~(13)C_2 value ranges from -26.7 per thousand to -15.9 per thousand and δ~(13)C_3 value ranges from -10.8 per thousand to -25.3 per thousand, indicating that the heavier hydrocarbons have a thermogenic origin; (ⅴ) the content of CO_2 is very low, and δ~(13)C_(CO2) value changes greatly, reflecting a characteristic of secondary change; (ⅵ) δ~(15)N_2 value ranges mainly from - 1 per thousand to +1 per thousand, indicating N_2 derived significantly from air. The negative linear correlation between the contents of N_2 and CH_4 reflects the activity of bacteria bearing surface water infiltrating into coal beds. The comprehensive tracing indices show that the coalbed gas in the studied areas is the mixed gas of primarily secondary biogenic gas and a part of remnant thermogenic gas. The uplift of coal beds and the development of faults in the studied areas create favorable conditions for the formation of the secondary biogenic gas.
机译：在辛集，李家庄和恩洪地区发现了二次生源煤层气，这是中国一种新型的遗传和能源类型的煤层气。这种气体的基本特征是：（ⅰ）气体的主要成分是甲烷，其C_1 / C_（1-5）值高于0.99，表明该气体是干燥气体的一部分； （ⅱ）δ〜（13）C_1值在-61.7 /千到-47.9 /千之间，主要低于-55 /千，远低于产热的δ〜（13）C_1的估计值甲烷根据煤岩的热演化程度（R_o值在0.87％至1.43％之间）表现出次生生物气的特征。 （ⅲ）甲烷的δD值介乎-244至千分之千; （ⅳ）δ〜（13）C_2值范围从-26.7至-15.9 /千，δ〜（13）C_3值范围从-10.8至千-25.3 /千，表明较重的烃具有热成因; （ⅴ）CO_2含量极低，δ〜（13）C_（CO2）值变化较大，反映出二次变化的特征； （ⅵ）δ〜（15）N_2值的范围主要在千分之-1至千分之+1，表明N_2显着来自空气。 N_2和CH_4含量之间的负线性关系反映了携带地表水渗入煤层的细菌的活性。综合示踪指数表明，研究区煤层气为主要次生生物气与一部分剩余热成气的混合气。研究区煤层的隆升和断层的发育为二次生物成因气的形成创造了有利条件。

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