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Volume 45 Issue 5
Sep.  2023
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2023  >  45(5): 912-925
CAO Jian, XIA Liuwen, HU Wenxuan, STÜEKEN Eva E, ZHI Dongming, TANG Yong, XIANG Baoli, HE Wenjun. Nitrogen isotope compositions and organic matter accumulation in terrestrial hydrocarbon source rocks in China[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(5): 912-925. doi: 10.11781/sysydz202305912
Citation: CAO Jian, XIA Liuwen, HU Wenxuan, STÜEKEN Eva E, ZHI Dongming, TANG Yong, XIANG Baoli, HE Wenjun. Nitrogen isotope compositions and organic matter accumulation in terrestrial hydrocarbon source rocks in China[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(5): 912-925. doi: 10.11781/sysydz202305912
shu

Nitrogen isotope compositions and organic matter accumulation in terrestrial hydrocarbon source rocks in China

doi: 10.11781/sysydz202305912
  • 1.

    School of Earth Science and Engineering, Nanjing University, Nanjing, Jiangsu 210023, China

  • 2.

    School of Earth and Environmental Sciences, University of St Andrews, St Andrews, Scotland, KY16 9A, UK

  • 3.

    PetroChina Tuha Oilfield Company, Hami, Xingjiang 839009, China

  • 4.

    PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China

  • Received Date: 2023-07-26
  • Rev Recd Date: 2023-08-06
  • Publish Date: 2023-09-28
    Abstract
  • As an important biological element, nitrogen is causally linked with organic matter accumulation, but a systematic and regular understanding has not been developed. This paper discusses this issue by taking the widely developed Permian-Paleogene terrestrial (lacustrine) hydrocarbon source rocks in China as an example. The results show that the terrestrial source rocks in China can be classified into three groups according to the nitrogen isotope (δ15N) compositions and combined with the salinity and evaporative alkali mineral characteristics: the circum-neutral group 1 (average δ15N=4.0‰±1.5‰), the circum-neutral group 2 (average δ15N=7.1‰±1.6‰), and the alkaline group (average δ15N=18.4‰±3.3‰). In the circum-neutral group with δ15N < 10‰, the δ15N of the source rocks is positively correlated with organic matter abundance, type, hydrocarbon generating capacity and shale oil potential due to the fact that higher δ15N characterizes changes in the composition of the hydrocarbon generating bio-precursors. In the alkaline group with δ15N>10‰, the organic matter types are good and shale oil potentials are higher, but the response relationship between δ15N of source rocks and organic matter accumulation is not as good as that of the circum-neutral group, reflecting that the organic matter accumulation in alkaline group is influenced by other comprehensive factors other than δ15N. Accordingly, the organic matter accumulation models of three types of lacustrine source rocks (< 5‰, 5‰-10‰, and >10‰) classified on the basis of δ15N were established. The δ15N has the potential to trace organic matter accumulation and quality of source rocks. For example, low δ15N type (δ15N < 5‰) is of poor quality and medium-high δ15N type (δ15N>5‰) is of good qualityin lacustrine source rocks. This paper enriches the biogeochemical and hydrocarbon source rock geochemical studies of nitrogen by exploring organic matter accumulation in source rocks from the new perspective of nitrogen isotope composition and nitrogen cycling.

     

    • All authors disclose no relevant conflict of interests.
    The study was designed and the experimental operation was completed by CAO Jian, XIA Liuwen and Eva E STVEKEN. The manuscript was drafted and revised by CAO Jian, XIA Liuwen, HU Wenxuan, ZHI Dongming, TANG Yong, XIANG Baoli and HE Wenjun. All the authors have read the last version of paper and consented for submission.
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