Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (4): 81-88.doi: 10.12108/yxyqc.20200408

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Geochemical characteristics and genesis of heavy oil in Beibuwan Basin

JIN Qiuyue1, YANG Xibing1, HU Lin1, LU Mei2   

  1. 1. Zhanjiang Branch, CNOOC Limited, Zhanjiang 524057, Guangdong, China;
    2. Zhanjiang Experiment Center, CNOOC Energy Technology & Services Limited, Zhanjiang 524057, Guangdong, China
  • Received:2019-11-27 Revised:2020-02-18 Online:2020-08-01 Published:2020-06-16

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Abstract: Several heavy oil fields have been found in Weixinan Sag and Wushi Sag of Beibuwan Basin. In order to study the characteristics and genesis of heavy oil,the physical properties, components, saturated hydrocarbon characteristics, biomarkers, oil and gas source and basin simulation analysis were carried out. The results show that:(1)The heavy oil in Beibuwan Basin is mainly distributed in uplift, slope zone and near depression zone, with high density and high viscosity.(2)There are three types of heavy oil in Beibuwan Basin. The first type is the crude oil generated by the source rocks in the lower part of the second member of Liushagang Formation in the center of the sag and transported to the trap for reservoir formation.Due to later uplift and denudation, the burial depth is less than 2 000 m. The thin overburden causes the reservoir to be biodegraded. This kind of crude oil has high maturity and high content of c30-4-methylsterane. The components were destroyed to different degrees and the saturated hydrocarbon and aromatic hydrocarbon components were lost in order. The second type of heavy oil is mainly distributed in the near-depression zone, which is the crude oil generated from the local lowthermal evolution oil shale and shale. It is characterized by low maturity, low Ts/Tm value and low contentof C30-4-methylsterane. The reservoir is accumulated in the near depression and buried in the near hydrocarbon generation threshold,and it is the early primary heavy oil. The third type ofheavy oil is mainly distributed in the slope belt, it is mainly composed of the mature crude oil generated from the lower source rock of the second member of Liushagang Formation in the deep depression and the low mature heavy oil generated from the upper source rock in the local area. Meanwhile,influenced by migration, diffusion, adsorption and other factors,the crude oil thickens. The content of C30-4-methylsterane is medium,and the buried depth of reservoir is more than 3 000 m. The mixed heavy oil is not biodegraded. The research results are of great significance for optimizing exploration and development deployment and guiding oil exploration in Beibuwan Basin.

Key words: heavy oil, geochemistry, genesis, Beibuwan Basin

CLC Number: 

  • TE122.1
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