Proceedings of the International Conference on Industrial Design and Environmental Engineering, IDEE 2023, November 24–26, 2023, Zhengzhou, China

Research Article

Geochemical Characteristics and Oil-Gas Source Identification of The SN31 Oil and Gas Reservoir in The Junggar Basin

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  • @INPROCEEDINGS{10.4108/eai.24-11-2023.2343381,
        author={Wenting  Pang and Yiming  Wang and Fan  Yang},
        title={Geochemical Characteristics and Oil-Gas Source  Identification of The SN31 Oil and Gas Reservoir in  The Junggar Basin },
        proceedings={Proceedings of the International Conference on Industrial Design and Environmental Engineering, IDEE 2023, November 24--26, 2023, Zhengzhou, China},
        publisher={EAI},
        proceedings_a={IDEE},
        year={2024},
        month={2},
        keywords={geochemical characteristics; oil-gas source; highly mature oil-gas of humic  type; sn31 oil and gas reservoir; junggar basin},
        doi={10.4108/eai.24-11-2023.2343381}
    }
    
  • Wenting Pang
    Yiming Wang
    Fan Yang
    Year: 2024
    Geochemical Characteristics and Oil-Gas Source Identification of The SN31 Oil and Gas Reservoir in The Junggar Basin
    IDEE
    EAI
    DOI: 10.4108/eai.24-11-2023.2343381
Wenting Pang1,*, Yiming Wang1, Fan Yang1
  • 1: Liaohe Oilfield Exploration and Development Research Institute
*Contact email: pangwt@petrochina.com

Abstract

Recently, with the improvement of exploration levels, there has been disputes about the geochemical characteristics and sources of oil and gas reservoirs in the SN31 well block of the Junggar Basin, and they need to be re-evaluated. By collecting crude oil and natural gas samples from key wells, testing, and analysing the components, stable carbon isotopes, and biomarkers of the samples using laboratory physical calibration, chromatography-mass spectrometry, and other methods, the physical and chemical characteristics, genetic types, and sources of oil and gas can be identified. The results show that the relatively low API value indicates a light to medium oil. The crude oil has a relatively high carbon isotope content, distributed between -29.4‰ to -28.7‰. The ratio of pristane (Pr) to phytane (Ph) indicates that the crude oil originates from humus-rich source rocks. The higher content of tricyclic terpenes and rearranged steranes indicates higher maturity. The content of C27>C29>C28 indicates that the crude oil is mixed with a certain proportion of higher plants. The natural gas content is high, and the drying coefficient is 0.86~0.94, which is indicted mainly wet gas. The non-hydrocarbon components are mainly N2 and CO2. The carbon isotope characteristics show that the methane carbon isotope distributes from -33.4‰ to -35.3‰ and the ethane carbon isotope distributes from -24.7‰ to -26.6‰.