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大佛寺井田煤层气地球化学特征及其成因分析

LIU Hou-ning,CAO Hui-feng

Coal Technology（2020）

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Abstract
为研究鄂尔多斯盆地西南缘煤层气的地球化学特征及成因类型,以彬长矿区大佛寺井田地面煤层气井采出的煤层气为研究对象,分析7 口煤层气排采井的煤层气成分,CH4含量88.013％～97.954 8％,平均90.986％,C2H6含量0.001％～0.028％,平均0.009％,C3H8含量极少,烃类组分的干湿指数C1/C1-5为0.999 91,为特干气.碳同位素分析显示δ13CH4值介于-80.516‰～-72.352‰,平均-76.579‰,相较理论值-43.4‰要轻得多.利用气成因判别图版判定大佛寺井田煤层气为次生生物成因气.
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