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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2025  >  47(4): 820-834
TANG Youjun, FU Tianyi, YANG Haifeng, WANG Feilong, TANG Guomin, SUN Peng. Crude oil type classification and source rock identification in Miaoxi area of Bohai Sea area based on stoichiometric method[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2025, 47(4): 820-834. doi: 10.11781/sysydz2025040820
Citation: TANG Youjun, FU Tianyi, YANG Haifeng, WANG Feilong, TANG Guomin, SUN Peng. Crude oil type classification and source rock identification in Miaoxi area of Bohai Sea area based on stoichiometric method[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2025, 47(4): 820-834. doi: 10.11781/sysydz2025040820
shu

Crude oil type classification and source rock identification in Miaoxi area of Bohai Sea area based on stoichiometric method

doi: 10.11781/sysydz2025040820
  • 1.

    College of Resources and Environment, Yangtze University, Wuhan, Hubei 430100, China

  • 2.

    Key Laboratory of Exploration Technologies for Oil and Gas Resources of Ministry of Education, Yangtze University, Wuhan, Hubei 430100, China

  • 3.

    Tianjin Branch of CNOOC (China) Co., Ltd., Tianjin 300459, China

  • 4.

    College of Petroleum Engineering, Yangtze University, Wuhan, Hubei 430100, China

  • Received Date: 2024-11-13
  • Rev Recd Date: 2025-06-12
  • Publish Date: 2025-07-28
    Abstract
  • The crude oil types in the Miaoxi area of the Bohai Sea area are highly complex, and the source rocks and genetic types remain unclear. Using multivariate statistical analysis, researchers can comprehensively examine the interrelationships among multiple correlated variables, which is particularly suitable for large-scale data mining and regional oil-oil and oil-source analysis. In this study, based on the biomarker parameter index system, hierarchical cluster analysis (HCA) and principal component analysis (PCA), common methods in multivariate statistical analysis, were applied for oil-oil and oil-source correlation of crude oil from multiple layers in the Miaoxi area. Three types of crude oil were detected. Type Ⅰ crude oil are characterized by a low C23TT/C30H ratio with relatively low maturity. It may be derived from a freshwater lacustrine reducing environment with abundant input of terrigenous organic matter. This type of crude oil shows a strong correlation with the source rocks in the first and second members of the Shahejie Formation in the eastern sag of the Huanghekou Depression. Type Ⅱ crude oil is at a mature stage and features lower C23TT/C30H and G/C30H ratios compared to Type Ⅰ, but with slightly higher Pr/Ph, sterane/hopane, and C19TT/C23TT ratios. These features also indicate a freshwater lacustrine environment with terrestrial organic matter input. It is inferred that Type Ⅱ oil is mainly sourced from the third member of the Shahejie Formation, with contributions from source rocks in both the eastern sag of the Huanghekou Depression and the southern sag of the Miaoxi Depression. Type Ⅲ crude oil is at a mature stage, exhibiting a wide distribution range in multiple biomarker parameters, including ETR[(C28TT+C29TT)/(C28TT+C29TT+ Ts)], G/C30H, C23TT/C21TT, Pr/Ph, C23TT/C30H C24Te/C26TT, C27/C29 regular sterane, and 4-methyl sterane/ C29 regular sterane. These variations reflect heterogeneity in the depositional environment of oil source rocks and organic matter types. It can be concluded that type Ⅲ crude oil is mixed-source oil, likely derived from the third and fourth members of the Shahejie Formation. Alternating least squares analysis results indicated that Type Ⅲ crude oil is mainly derived from the source rocks in the fourth member of the Shahejie Formation, with a contribution rate of 85% to 93%, while the contribution from the third member is only 7% to 15%.

     

    • All authors declare no relevant conflict of interests.
    The study was designed and examined by TANG Youjun, FU Tianyi, and TANG Guomin. The experimental operation and data organization were completed by FU Tianyi and SUN Peng. The figures were drawn and revised by YANG Haifeng and WANG Feilong. All authors have read the final version of the paper and consented to its submission.
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