2α-Methylhopane: Indicator for Oil–Source Correlation in the Pearl River Mouth Basin, China

IF 1.7 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Aquatic Geochemistry Pub Date : 2017-05-16 DOI:10.1007/s10498-017-9317-7

Wanfeng Zhang, Xiangtao Jiang, Liling Pang, Xuanbo Gao, Shukui Zhu

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引用次数: 6

Abstract

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/∑C₂₉ steranes, 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.

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2α-甲藿烷:珠江口盆地油源对比指标

采用综合二维气相色谱-飞行时间质谱(GC?×?GC- tofms)对珠江口盆地石油样品进行了分析。在2α-甲基藿烷系列中观察到高丰度的化合物，并进行了精确的定量。虽然2α-甲基藿烷系列可以作为原油和烃源岩样品中重要的生物标志物，但它的使用通常少于非甲基化藿烷。恩平组和文昌组烃源岩2α-MHI [c312 α-甲藿烷× 100/(c312 α-甲藿烷+ C30-αβ-藿烷)%]范围分别为0.81 ~ 5.77%和9.06 ~ 23.93%。文昌组原油中2α-甲基藿烷系列的高丰度是由无氧光养生物形成的。2α-甲基藿烷相关参数与C30-4-甲基甾烷/∑C29甾烷、Pr/Ph和双二烷- t /C30-α - β-藿烷相关。2α-甲藿烷系列在中深湖环境和海相沉积环境中富集。结果表明，2α-甲藿烷系列可作为区分不同烃源岩原油的有效生物标记物，扩大了PRMB生物标记物组合，有利于油气资源评价。

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来源期刊

Aquatic Geochemistry 地学-地球化学与地球物理

CiteScore

4.30

自引率

0.00%

发文量

审稿时长

1 months

期刊介绍： We publish original studies relating to the geochemistry of natural waters and their interactions with rocks and minerals under near Earth-surface conditions. Coverage includes theoretical, experimental, and modeling papers dealing with this subject area, as well as papers presenting observations of natural systems that stress major processes. The journal also presents `letter''-type papers for rapid publication and a limited number of review-type papers on topics of particularly broad interest or current major controversy.