2 alpha-Methylhopane: Indicator for Oil-Source Correlation in the Pearl River Mouth Basin, China
2 alpha-Methylhopane: Indicator for Oil-Source Correlation in the Pearl River Mouth Basin, China
复制标题
2 α-甲基藿烷：中国珠江口盆地油源关联指标
DOI：
10.1007/s10498-017-9317-7
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发表时间：
2017
影响因子：
1.6
通讯作者：
Zhu Shukui
中科院分区：
文献类型：
--
作者：
Zhang Wanfeng;Jiang Xiangtao;Pang Liling;Gao Xuanbo;Zhu Shukui
使用综合二维气相色谱结合飞行时间质谱 (GC × GC-TOFMS) 对从珠江口盆地 (PRMB) 采集的石油样品进行分析。观察到并准确定量了 2α-甲基藿烷系列中的高丰度化合物。尽管 2α-甲基藿烷系列可以成为石油和烃源岩样品中的重要生物标志物，但其使用量通常少于非甲基化藿烷。本研究中恩平组和文昌组原油中2α-MHI[C312α-甲基藿烷×100/(C312α-甲基藿烷+C30-αβ-藿烷)(%)]范围分别为0.81%~5.77%和9.06%~23.93%。文昌组衍生油中 2α-甲基藿烷系列的高丰度归因于缺氧光养生物。相关的2α-甲基藿烷参数显示出与C30-4-甲基甾烷/ΣC29甾烷、Pr/Ph和联卡迪烷-T/C30-αβ-藿烷的相关性。此外，2α-甲基藿烷系列在中深湖环境和海相沉积环境中都富含。结果表明，2α-甲基藿烷系列可以作为有效的生物标志物来区分不同烃源岩的石油，扩大PRMB生物标志物组合，有利于石油资源评价。
Oil samples collected from the Pearl River Mouth Basin (PRMB) were analyzed using comprehensive two-dimensional gas chromatography coupled with time-of-flight mass spectrometry (GC × GC-TOFMS). High abundances of compounds in the 2α-methylhopane series were observed and accurately quantified. Although the 2α-methylhopane series can be a prominent biomarker in the oil and source rock samples, it has generally been used less than non-methylated hopanes. In this study, the 2α-MHI [C312α-methylhopane × 100/(C312α-methylhopane + C30-αβ-hopane) (%)] ranges from 0.81 to 5.77% and 9.06 to 23.93% in Enping Formation- and Wenchang Formation-derived oils, respectively. The high abundance of the 2α-methylhopane series in Wenchang Formation-derived oils is attributed to anoxygenic phototrophs. The relevant 2α-methylhopane parameters showed correlations with C30-4-methyl steranes/∑C29steranes, Pr/Ph and bicadinane-T/C30-αβ-hopane. Furthermore, the 2α-methylhopane series are rich in middle-deep lacustrine environments as well as marine sedimentary environment. The results indicated that the 2α-methylhopane series could be used as effective biomarkers to distinguish oils derived from different source rocks, as well as to enlarge the PRMB biomarker assemblages, which is beneficial to the evaluation of petroleum resources.