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为研究原油中稳定碳同位素在长期地史中的周期性变化,对已知源岩的514个原油中的C_(15)+饱和烃和芳香烃的稳定碳同位素组分做了分析。结果发现随着地质年龄的减小每种组分的稳定碳同位素组成相对富集~(13)C,在前寒武系—寒武系—奥陶系、三叠系—侏罗系和早第三系—晚第三系的交界处发生了三次重要的~(13)C富集。利用同位素较小的变化划分出四组明显不同的原油,查明原油与有机相和二次作用过程关系不大。对显生宙生物圈的演化与稳定碳同位素组分的阶段性变化作了对比,表明原油同位素的变化与保存的浮游植物的多样性有相关。
In order to study the periodic variation of stable carbon isotopes in crude oil over a long period of time, the stable carbon isotope compositions of C 15 saturated hydrocarbons and aromatics in 514 crude oils from known source rocks were analyzed. The results show that the stable carbon isotope composition of each component is relatively enriched ~ (13) C with the decrease of geologic ages. In the Precambrian-Cambrian-Ordovician, Triassic-Jurassic and Early There are three important ~ (13) C enrichments in the Tertiary-Late Tertiary junctions. The four groups of obviously different crude oil were divided by the smaller change of isotope, and it was found that there was not much relation between the crude oil and the organic phase and the secondary action. The evolution of the Phanerozoosphere and the stable variation of carbon isotope composition are compared, indicating that the variation of crude oil isotopes is related to the diversity of preserved phytoplankton.