羌塘盆地昂达尔错地区侏罗系烃源岩生物标志物特征及其指示意义

发布时间：2018-05-08 22:22

本文选题：烃源岩 + 生物标志物　；参考：《石油实验地质》2017年03期

【摘要】：以烃源岩抽提物的饱和烃色谱—质谱分析为基础,剖析了羌塘盆地昂达尔错地区3套主要烃源岩的生物标志物特征,探讨了其沉积环境和成熟度指示意义。研究表明:下侏罗统曲色组烃源岩具有较高的(C_(21)+C_(22))/(C_(28)+C_(29))、Ts/Tm、C_(31)藿烷S/R及重排甾烷/规则甾烷比,以腐泥型、腐殖腐泥型海相有机质输入为主,呈成熟烃源岩特征;中侏罗统布曲组烃源岩以相对较低的Pr/Ph和C_(19)/C_(23)三环萜烷比区别于其他2套烃源岩,沉积于较强的海相还原环境,呈腐殖腐泥型、腐泥型有机质输入和低熟—成熟烃源岩特征;中侏罗统夏里组烃源岩沉积于低盐度海陆过渡环境,有机质类型以腐殖型和腐泥腐殖型为主,显示低成熟烃源岩特征。
[Abstract]:Based on the saturated hydrocarbon chromatography-mass spectrometry analysis of source rock extracts, three sets of biomarker characteristics of major source rocks in Andalco area, Qiangtang Basin, are analyzed, and their sedimentary environment and maturity indication significance are discussed. The results show that the lower Jurassic meandering source rocks have a high C _ (21) C _ (T _ (21) C _ (T _ (22) / C ~ (+) / C ~ (+) ~ (28) C ~ (29) T _ (S / T) C ~ (1) C _ (1) C _ (1) C / R and the rearrangement of sterane / regular sterane ratios, which are mainly humic mud type, humic mud type marine organic matter input, and mature hydrocarbon source rock characteristics, and the results show that: (1) the source rocks of the lower Jurassic epoch are characterized by mature hydrocarbon source rocks. The source rocks of the Buqu formation in the Middle Jurassic are different from the other two sets of source rocks by relatively low Pr/Ph and C _ S _ (19 / C ~ (23) triterpene ratios. They are deposited in a strong marine reductive environment and are characterized by humic saprotic mud type organic matter input and low-mature source rocks. The source rocks of the Xiali formation of the Middle Jurassic are deposited in the low salinity sea and land transitional environments, and the types of organic matter are mainly humic type and humic humic type, showing the characteristics of low mature hydrocarbon source rocks.
【作者单位】：中国地质调查局成都地质调查中心;国土资源部沉积盆地与油气资源重点实验室;
【基金】：中国地质调查局“青藏高原非常规油气调查”项目(1212011221106)资助
【分类号】：P618.13

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