中文摘要：

对淮北煤田祁东煤矿6个煤层的24个煤样和12个气样的稳定有机碳同位素分析，分别研究了煤和瓦斯中碳同位素的分布特征和变化趋势，为不同煤层及瓦斯源分析提供理论依据。研究表明：祁东煤矿煤的δ13C为–25.11‰~–22.76‰，6-1煤层至9煤层碳同位素均值呈波动变化，可能受当时成煤时期沉积环境的影响；瓦斯的δ13C1为–63.65‰~–52.51‰，表现出次生生物成因气的变化特征，二氧化碳碳同位素特征(–22.61‰~–17.96‰)表明其均是煤热解而来。

英文摘要：

Based on stable organic carbon isotopic analysis for24coal sample and12gas samples from six coal seams in Qidong coal mine,Huaibei coalfield,the paper has studied distribution characteristics and variation trend of the coal and gas carbon isotope,providing the theoretical basis for the analysis of different coal seams and gas sources.The study shows:Variation range ofδ13C is-22.76‰~-25.11‰.δ13C value in coal seams6-1to9presents undulated variation,probably influenced by the coal depositional environment;Variation range of methaneδ13C1is-52.51‰~-63.65‰,The variation range ofδ13C1is characterized by containing secondary biogenic gas.And the CO2carbon isotopic values(-22.61‰~-17.96‰)demonstrated that CO2in methane was resulted from coal pyrolysis.