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对 5个广东泥炭样品和 3个准噶尔盆地西北缘原油样品中支链烷烃和环烷烃进行了分离 ,应用色谱 -同位素比值质谱 (GC -IRMS)测定了其中藿烷类单体碳稳定同位素比值 ,研究它们的碳同位素组成变化 ,结果表明泥炭中藿烷类δ1 3C为 - 2 1 .7‰～ - 34.4‰ ,与湖相页岩和原油中藿类相比 ,相对富集1 3C ;同一样品中 ,不同碳数和不同构型的藿烷之间 ,δ1 3C相差 4.4‰～ 1 2 .8‰ ,说明同一沉积环境中可能生长具有不同碳同位素组成藿类先质的多种微生物 ,相对亏损1 3C的C2 9βα、C2 9ββ、C31 βα藿烷可能来自甲烷菌 ,相对富集1 3C的C2 9αβ、C30 αβ藿烷可能来自化学自养型细菌 ;准噶尔盆地原油中藿烷类碳同位素δ1 3C为 - 30 .6‰～ - 53.4‰ ,原油之间藿烷δ1 3C值具有明显差别 ,它们指示克乌断裂带东部原油来自二叠系 ,西部原油来自侏罗系与三叠系
The branched-chain paraffins and naphthenes were separated from five peat samples in Guangdong and three crude oil samples from the northwestern margin of Junggar Basin. The carbon stable isotope ratios of hopane monomers were determined by GC-IRMS. The changes of their carbon isotope compositions showed that the δ1 3C of peachoids in peat ranged from -21.7% to -34.4%, which was relatively rich in 1 3C compared with lacustrine shale and crude oil, , Δ13C differ from 4.4 ‰ to 12.8 ‰, indicating that there may be a relative loss of various microorganisms with different carbon isotope composition in the same depositional environment in the same sediment environment C2C9βα, C2 9ββ and C31βα hopane in 1 3C may originate from methane bacteria, C2 9αβ which is relatively enriched in 1 3C, and C30 αβ hopane may originate from autotrophic bacteria. In the Junggar basin, hopanes carbon δ13C Is -30.6% ~ -53.4%. The δ13C value of hopane is significantly different from that of crude oil, which indicates that the crude oil in the eastern part of the Kewu fault zone comes from the Permian and that in the western part comes from the Jurassic and Triassic