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碳氢同位素研究是油气地球化学研究的一个重要方面。通过对神山褐煤镜质组与丝质组中碳氢同位素的分析得出:同一温阶,镜质组和丝质组气体产物中甲烷及其同系物具有与天然气相似的碳同位素分布特征,随烷烃分子碳数增加而逐渐增高,即δ13C1<δ13C2<δ13C3;不同温阶时,气体产物中甲烷及其同系物的δ13C具有明显的同位素分馏特征,即随温度的增加δ13C1、δ13C2、δ13C3值相应增高。而对镜质组与丝质组气体产物中的δD而言:同一温阶,具有δDH2<δD1<δD2<δD3<δD4的规律;不同温阶,随温度的增加,δDH2、δD1、δD2、δD3、δD4值相应增高,也表现出明显的同位素分馏特征。
Hydrocarbon isotope studies are an important aspect of geochemical research. Through the analysis of hydrocarbon isotopes in the limestone group and the siliceous group in the Kushan coal, it is concluded that the methane and its homologues in the same temperature range, vitrinite and siliceous group have similar carbon isotope distribution characteristics to natural gas, Δ13C1 <δ13C2 <δ13C3. The δ13C values of methane and its homologues in gas products show obvious isotopic fractionation at different temperature steps, that is, δ13C1, δ13C2 and δ13C3 values increase with increasing temperature Increase. For the δD in the vitrinite and siliceous gas products, the same temperature order has the rule of δDH2 <δD1 <δD2 <δD3 <δD4. With the increase of temperature, δDH2, δD1, δD2, δD3 , ΔD4 value correspondingly increased, also showed obvious isotopic fractionation characteristics.