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Geoscience ›› 2025, Vol. 39 ›› Issue (03): 814-824.DOI: 10.19657/j.geoscience.1000-8527.2025.002

• Energy Geology and Engineering • Previous Articles     Next Articles

Geochemical Characteristics of Aromatics in Crude Oil and Oil-Source Correlation of the Jurassic Sangonghe Formation in Moxizhuang, Junggar Basin

QU Yansheng1,2(), PAN Zhiqiang3, HE Daxiang3,*(), Zhong Ningning1, NIU Huapeng1, YANG Meihua2, HAN Liguo2   

  1. 1. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China
    2. Exploration and Development Research Institute of Shengli Oilfield, SINOPEC, Dongying, Shandong 257061
    3. China Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education, Wuhan, Hubei 430100, China
  • Online:2025-06-10 Published:2025-07-03
  • Contact: HE Daxiang

Abstract:

In this study, the crude oil samples of Jurassic Sangonghe Formation in Moxizhuang area were selected and analyzed by geochemical experiments. The geochemical characteristics of aromatic compounds in crude oil samples of Sangonghe Formation in Moxizhuang area were analyzed by gas chromatography-mass spectrometry. Combined with carbon and hydrogen isotopes of n-alkanes, the source, maturity and sedimentary environment of organic matter were determined. The results show that the crude oil of Jurassic Sangonghe Formation in Moxizhuang area is dominated by phenanthrene series compounds, and the contents of pyrene, benzopyrene compounds are relatively abundant. The contents of 1,2,5-trimethylnaphthalene, biphenyl, anthracene and perylene derived from higher plants are less. Combined with the characteristics of hydrogen isotope composition of monomer hydrocarbons, it indicates that the organic matter is mainly derived from lower aquatic organisms, with a little contribution from higher plants. The dominant fluorene in the three fluorene series compounds reflects that the sedimentary environment of the crude oil in the Sangonghe Formation is dominated by freshwater deposition, and the reducibility is weak. The maturity parameters such as MPI-1, F1 and F2 all show that the thermal evolution degree of crude oil in Sangonghe Formation is high and it is in the high maturity stage. By using cluster analysis method, combined with the comparison results of monomer hydrocarbon carbon isotope and some aromatic hydrocarbon parameters, it is indicated that the crude oil of Sangonghe Formation has a good genetic relationship with the source rock of Permian Lower Wuerhe Formation. The results can provide reference for the exploration and development of oil and gas resources in Moxizhuang area.

Key words: Junggar Basin, Moxizhuang area, Sangonghe group, crude oil, aromatic, isotope, oil-sourcecorrelation

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