Novel tetracyclic terpanes in crude oils and source rock extracts in pearl river mouth basin and their geological significance
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  • 作者:Ning Ma (1) (2)
    Dujie Hou (2)
    Hesheng Shi (1)
  • 关键词:tetracyclic terpane ; terrigenous input ; oil genetic type ; Pearl River Mouth Basin
  • 刊名:Journal of Earth Science
  • 出版年:2014
  • 出版时间:August 2014
  • 年:2014
  • 卷:25
  • 期:4
  • 页码:713-718
  • 全文大小:504 KB
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  • 作者单位:Ning Ma (1) (2)
    Dujie Hou (2)
    Hesheng Shi (1)

    1. Shenzhen Branch of CNOOC Ltd., Guangzhou, 510240, China
    2. Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education, School of Energy Resources, China University of Geosciences (Beijing), Beijing, 100083, China
  • ISSN:1867-111X
文摘
Novel tetracyclic terpanes X and Y namely C24-des-A-oleanane and C27 tetracyclic terpane were detected in crude oils and source rock extracts in Zhu 1 depression in Pearl River Mouth Basin by GC-MS analysis technology. These compounds are similar to oleanane in the structure, and their relative abundance in m/z 191 partial mass chromatogram has a good correlation with oleanane. Here compounds X and Y are considered to be derived from the des-A degradation of oleanoid precursor. The ratio of X/(X+C24) and Y/(Y+C24) increase with the increasing inputs of terrigenous organic matter in crude oils. Wenchang Formation middle-deep lacustrine source rocks with planktonic algae organic matter inputs and oil generating from it contain low abundance of compounds X and Y, while Enping Formation coal measures source rocks with terrigenous higher plants organic matter inputs and oil generating from it usually have higher compounds X and Y. In general when two terrigenous compounds C19 tricyclic terpane and bicadinane-T are high in crude oils, there are also a corresponding high abundant compounds X and Y. Relative abundance of compounds X and Y is closely related to the source of organic matter and it can indicate the input of terrigenous organic matter.

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