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Volume 45 Issue 5
Sep.  2023
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2023  >  45(5): 904-911
SUN Yongge, KONG Lishu, LU Qinghua, GU Yi. Molecular carbon isotopic geochemistry records of thermal cracking in the palaeo-reservoir of well Shunnan 1 in Guchengxu Uplift, Tarim Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(5): 904-911. doi: 10.11781/sysydz202305904
Citation: SUN Yongge, KONG Lishu, LU Qinghua, GU Yi. Molecular carbon isotopic geochemistry records of thermal cracking in the palaeo-reservoir of well Shunnan 1 in Guchengxu Uplift, Tarim Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(5): 904-911. doi: 10.11781/sysydz202305904
shu

Molecular carbon isotopic geochemistry records of thermal cracking in the palaeo-reservoir of well Shunnan 1 in Guchengxu Uplift, Tarim Basin

doi: 10.11781/sysydz202305904
  • 1.

    Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

  • 2.

    Organic Geochemistry Unit, School of Earth Sciences, Zhejiang University, Hangzhou, Zhejiang 310027, China

  • Received Date: 2023-07-24
  • Rev Recd Date: 2023-09-14
  • Publish Date: 2023-09-28
    Abstract
  • The highly mature light oil from well Shunnan 1 in the Guchengxu Uplift, Tarim Basin is considered to be a typical residual oil by thermal cracking. The study reveals that the abundant monoaromatic hydrocarbons and polynuclear aromatics in the crude oil of well Shunnan 1 are the by-products of severe in-reservoir oil-cracking during the geological history. The monoaromatic hydrocarbons are the intermediate products of thermal cracking, cyclization and aromatization, while the polynuclear aromatics are indicative of polycondensation reaction. The strong carbon isotopic fractionation induced by hydrocarbon molecule cracking and polycondensation makes the molecule carbon isotope of n-alkanes and the molecule carbon isotope of alkyl naphthalenes in the crude oil of well Shunnan 1 respectively 8‰-10‰ and 6‰-8‰ heavier compared to those from unaltered crude oils in Lower Paleozoic oil-bearing system. The results further proved that the aromatic molecules related to oil cracking and their stable carbon isotopic compositions could be a potentially powerful tool to identify whether thermal alteration occurred in deep and ultra-deep oil reservoirs, and further helps to effectively evaluate the oil and gas phase and resource pattern in the deep and ultra-deep reservoirs.

     

    • All authors disclose no relevant conflict of interests.
    SUN Yongge and GU Yi were responsible for designing the research plan. LU Qinghua and GU Yi were responsible for sample collection, basic data collection, and exploration progress research. KONG Lishu completed the experimental work. SUN Yongge was responsible for writing the paper and drawing the diagrams. All the authors have participated in the discussion of the results and the revision of the paper, and consented for submission.
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