Journal V.23.No.2.2021
Pages
Download article

Geological and geochemical conditions for the formation of the oil composition in the deposits of the Permian and Jurassic oil and gas complexes in the Fukang depression (Junggar basin)

H. Yang, E.V. Soboleva

Original article

DOI https://doi.org/10.18599/grs.2021.2.10

110-119
rus.

open access

Under a Creative Commons license
Within the eastern part of the Fukang depression, the main productive series are confined to the Permian and Jurassic oil and gas complexes (OGC), in which the Middle Permian and Lower-Middle Jurassic oil and gas source rocks (OGSRs) are distinguished. The article discusses in detail the oil and gas source characteristics of the Middle Permian and Lower-Middle Jurassic rocks, the molecular composition of oils and bitumoids from the OGSRs, and also interprets the characteristics of the biomarkers in them from the standpoint of the sedimentary-migration theory of oil generation. An attempt is made to explain the reasons for the difference in the properties and composition of oils from different OGCs. It is shown that the composition of hydrocarbon fluids of deposits is determined not only by the geological and geochemical conditions of sedimentation of oil and gas source deposits, but also associated with migration processes and subsequent secondary changes in the accumulation. In terms of composition, three groups of oils were identified: Permian and Jurassic heavy oils with a light carbon isotopic composition and the presence of β-carotene and gammacerane, they underwent different degrees of biodegradation, which depended on the geological conditions of the deposits; Permian medium oils in density (0.84 and 0.87 g/cm3), the composition of biomarkers of which is very close to that of the first group, and Jurassic light oils with a high content of solid paraffins and a heavier carbon isotopic composition, almost do not contain β-carotene and gammacerane concentrations are low.
 

Rock-Eval pyrolysis, generation potential, hydrocarbon fluids, sedimentation conditions, geological and geochemical conditions, source rocks, deposits formation, molecular composition, biomarkers, Fukang depression, Junggar oil and gas basin

 

  • Bao Jianping, Zhu Junzhang, Zhu Cuishan et al. (2007). A biodegradation experiment of crude oils in laboratory. Petroleum Exploration and Development, 34(1), pp. 43–47.
  • Chen Jianping, Wang Xulong, Deng Chunping et al. (2016). Oil and gas source, occurrence and petroleum system in the Junggar Basin, Northwest China. Acta Geologica Sinica, 90(3), pp. 421–450.
  • Galimov, E.M. (1986). The isotopic method of identifying oil-source beds applied to several regions of the USSR. Izv. Akad. Nauk SSSR, Ser. Geol., 4, pp. 3–21. (In Russ.)
  • He Dengfa, Zhang Lei, Wu Songtao et al. (2018). Tectonic evolution stages and features of the Junggar Basin. Oil & Gas Geology, 39(5), pp. 845–861. https://doi.org/10.11743/ogg20180501
  • Huang Difan, Li Jinchao, Zhang Dajiang. (1984). Kerogen types and study on effectiveness, limitation and interrelation of their identification parameters. Acta Sedimentologica Sinca, 2(3), pp. 18–33.
  • Huang W.Y., Meinschein W.G. (1979). Sterols as ecological indicators. Geochimica et Cosmochimica Acta, 43(5), pp. 739–745. https://doi.org/10.1016/0016-7037(79)90257-6
  • Liu Gang, Wei Yanzhao, Chen Gang et al. (2019). Genetic mechanism and distribution characteristics of Jurassic-Cretaceous secondary reservoirs in the hinterland of Junggar Basin. Acta Petrolei Sinica, 40(8), pp. 914–927. https://doi.org/10.7623/syxb201908003
  • Lu Jungang, Chen Shijia, Wang Xulong et al. (2010). Maturity study of the strong biodegradation viscous oil: taking the Santai-Beisantai area of Junggar Basin as an example. Petroleum Geology & Experiment, 32(4), pp. 373–376.
  • Peters K.E., Moldowan J.M. (1993). The biomarker guide: interpreting molecular fossils in petroleum and ancient sediments. US: Prentice Hall, 363 p.
  • Peters K.E., Walters C.C., Moldowan, J.M. (2005). The Biomarker Guide, Volume 2: Biomarkers and Isotopes in Petroleum Exploration and Earth History. New York: Cambridge University Press, 700 p.
  • Soboleva E.V., Guseva A.N. (2010). Chemistry of combustible minerals. Moscow: Moscow University Publ., 312 p. (In Russ.)
  • Wang J, Cao Yc, Wang Xt et al. (2018). Sedimentological constraints on the initial uplift of the West Bogda Mountains in Mid-Permian. Sci Rep 8, 1453. https://doi.org/10.1038/s41598-018-19856-3
  • Wang Yutao (1991). Petroleum accumulation predicted from biodegradation of the crude oil. Petroleum Exploration and Development, 5, pp. 31–37.
  • Wu Qingfu (1986). Growth stage, classification of structural units and cause of partial tectonic of Junggar Basin. Xingjiang Petroleum Geology, 7(1), pp. 29–37.
  • Yang Houqiang, Soboleva E.V. (2020). The Jurassic Oil and Gas Source Rocks of Hydrocarbon Deposits in the Eastern Part of the Fukang Depression (Junggar Oil and Gas Basin). Moscow Univ. Geol. Bull., 75, pp. 600–608. https://doi.org/10.3103/S0145875220060071)
  • Zhao Bai (1992). The formation and evolution of Junggar Basin. Xingjiang Petroleum Geology, 13(2), pp. 191–196.
  •  

Houqiang Yang
Lomonosov Moscow State University
1, Leninskie gory, Moscow, 119234, Russian Federation
e-mail: yanghouqiang@qq.com

Elena Vsevolodovna Soboleva
Lomonosov Moscow State University
1, Leninskie gory, Moscow, 119234, Russian Federation

 

For citation:

Yang H., Soboleva E.V. (2021). Geological and geochemical conditions for the formation of the oil composition in the deposits of the Permian and Jurassic oil and gas complexes in the Fukang depression (Junggar basin). Georesursy = Georesources, 23(2), pp. 110–119. DOI: https://doi.org/10.18599/grs.2021.2.10

© 2023 The Authors. Published by Georesursy LLC