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通过对松辽盆地徐家围子烃源岩和原油热模拟实验、烷烃气碳同位素组成分析,认为在高演化阶段单一热力作用可以引起重烃气(δ13C2>δ13C3>δ13C4)碳同位素组成倒转,但CH4与C2H6(δ13C1>δ13C2)却很难发生倒转.庆深气田天然气重甲烷碳同位素组成、烷烃气碳同位素完全倒转、高稀有气体同位素组成(R/Ra>1.0),说明该气田天然气来源具有多样性.利用R/Ra与CO2/3He和R/Ra与CH4/3He关系对庆深气田天然气成因类型进行识别,认为该气田烷烃气中甲烷有部分为无机成因,重烃气则为有机成因.该地区高地温梯度导致有机成因重烃气碳同位素组成发生倒转,而CH4与C2H6碳同位素组成倒转主要与重碳同位素的无机甲烷混入有关.
Based on the thermal simulation experiments and the carbon isotope composition analysis of alkanes in Xujiaweizi, Songliao Basin, it is considered that the single thermodynamic effect during the high evolution stage can cause the carbon isotope composition of heavy hydrocarbon gas (δ13C2> δ13C3> δ13C4) to reverse. However, CH4 and C2H6 (δ13C1> δ13C2) are very difficult to reverse.In the Qinshen gas field, the heavy methane carbon isotope composition, complete inversion of carbon and carbon isotope composition, and high Rare-gas isotope composition (R / Ra> 1.0) indicate that the natural gas source of this gas field has The genetic types of natural gas in Qingshen gas field are identified by using R / Ra, CO2 / 3He, R / Ra and CH4 / 3He relationships, and some of the methane in the gas field is considered as inorganic and heavy hydrocarbon gas is organic .High terrestrial temperature gradients in the area led to reversal of the carbon isotope composition of heavy hydrocarbons in the organic genera, while inversion of the carbon isotope composition of CH4 and C2H6 was mainly due to the incorporation of inorganic methane from heavy carbon isotopes.