论文部分内容阅读
在中国有机成因气(煤成气和油型气)及无机成因烷烃气(甲烷)碳同位素系列、R/Ra以及CH4/3He大量分析数据的基础上,结合美国、俄罗斯、德国和澳大利亚等国家相应项次众多的分析数据,经综合对比研究,提出鉴别无机成因和有机成因烷烃气的4个指标:①无机成因甲烷碳同位素组成一般>-30‰,有机成因甲烷碳同位素组成一般<-30‰;②无机成因烷烃气具有负碳同位素系列(δ13C1>δ13C2>δ13C3>δ13C4)和甲烷碳同位素组成一般>-30‰的特征;③R/Ra>0.5和δ13C1-δ13C2>0的天然气是无机成因烷烃气;④CH4/3He≤106是无机成因烷烃气(甲烷),CH4/3He≥1011是有机成因烷烃气.
Based on the large amounts of organic gas (coal-formed gas and oil-type gas) and inorganic-derived hydrocarbon gas (methane) carbon isotope series, R / Ra and CH4 / 3He data in China, combined with the data from the United States, Russia, Germany and Australia According to a comprehensive comparative study, four indicators for distinguishing inorganic genesis from organic-derived alkane gas are proposed: (1) the inorganic carbon isotope composition of methane is generally> -30% o, and the organic carbon isotope composition of methane is generally <-30 ‰; ② Inorganic hydrocarbon gas has the characteristics of negative carbon isotope series (δ13C1> δ13C2> δ13C3> δ13C4) and methane carbon isotope composition of> -30 ‰; (3) Natural gas with R / Ra> 0.5 and δ13C1-δ13C2> 0 is inorganic Alkane gas; ④ CH4 / 3He≤106 is an inorganic causative alkane gas (methane), CH4 / 3He≥1011 is an organic caustic gas.