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Natural Gas Geoscience ›› 2020, Vol. 31 ›› Issue (2): 258-267.doi: 10.11764/j.issn.1672-1926.2019.09.007

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Geochemistry, genesis and distribution of crude oils in the Fukang fault zones and their periphery in Junggar Basin

Hai-lei LIU1(),Hui LI1,Hui XIANG2,Xue-yong WANG1,She-kuan DU3   

  1. 1.Research Institute of Petroleum Exploration and Development，PetroChina Xinjiang Oilfield Company，Kalamay，834000，China
    2.Zhundong Oil Extraction Plant，PetroChina Xinjiang Oil Company，Fukang 831500，China
    3.Key Laboratory of Petroleum Resources，Gansu Province/Key Laboratory of Petroleum Resources Research，Chinese Academy of Sciences，Lanzhou 730000，China
  • Received:2019-07-19 Revised:2019-09-23 Online:2020-02-10 Published:2020-02-28
  • Supported by:
    The Major Science and Technology Project of CNPC(2017E-0401)

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Abstract:

The Fukang fault zones and their periphery are typically hybrid petroleum systems with complex hydrocarbon genesis in the southeastern Junggar Basin. The complexity results in uncertainties to understand the hydrocarbon accumulation mechanisms and shape oil and gas exploration strategies. To deepen the understanding of these issues, this paper systematically analyzes geochemistry of crude oils in the study area and then discusses the oil genesis. The results show that the crude oil in the study area has similar mountain type C20-C21-C23 tricyclic terpane distribution and rising type C27-C28-C29 regular sterane characteristics. Nevertheless, the crude oils in the study area can still be divided into three types based on geochemical difference. Type I crude oil distributes throughout the entire study area, originating from the Permian Lucaogou Formation (equivalent Pingdiquan Formation), with typical geochemical characteristics of δ13C lower than -28‰, Pr/Ph lower than 2. Type II crude oil, originating from the Carboniferous with some Permian contribution, is mainly distributed in the western part of the Beisantai uplift and the Well Ji15 in the Jimsar Sag, with the typical geochemical characteristics of δ13C higher than -28‰, Pr/Ph between 1.7 to 2.5. Type III crude oil is discovered in the southern slope of Xiquan area and the western slope of Santai Uplift, originating from a mixed source of Jurassic and Permian, with the typical geochemical characteristics of δ13C between -29‰ and -26.5‰, Pr/Ph higher than 2.5. The distribution and genesis of the crude oils are typical of source control. Based on this result, it is suggested that the exploration of the study area should be focused on the distribution of source rocks, and to locate large- and medium-sized reservoirs in the uplift and stable tectonic setting areas.

Key words: Hybrid petroleum systems, Crude oil geochemistry, Oil?source correlation, Fukang fault zone, Junggar Basin

CLC Number: 

  • TE122.1+13

Fig.1

Distribution of structural units and crude oil genetic types in the Fukang fault zones and their periphery in the Junggar Basin"

Fig.2

Cross-section of carbon isotope and Pr/Ph ratio of the crude oil in the Fukang fault zone and its periphery in the Junggar Basin"

Fig.3

Distribution of aromatic hydrocarbon components of crude oil in the east-west the Fukang fault zone in the Junggar Basin"

Fig.4

Cross-section of Pr/nC17 and Ph/nC18 of the crude oil in the Fukang fault zone and its peripheral in the Junggar Basin （plate according to CONNAN et al.[36]）"

Fig.5

Relative content distribution of C20-C21-C23 tricyclic terpane (a) and C27-C28-C29 regular sterane (b) of the crude oil of the Fukang fault zone and its periphery in the Junggar Basin"

Fig.6

Chromatography-mass spectrometry of three types of crude oil in the Fukang fault zone and its periphery in the Junggar Basin"

Fig.7

Carbon isotope of source rocks kerogen and crude oil in the Fukang fault zone and its periphery in the Junggar Basin"

Fig.8

Typical oil and gas biomarkers of the Fukang fault zone in the Junggar Basin"

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