Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (6): 1665-1677.doi: 10.13278/j.cnki.jjuese.20200308

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Genetic Types and Main Controlling Factors of Crude Oil Distribution in South-Central Miaoxi Depression of Bohai Bay Basin

Sun Zhe, Yu Haibo, Peng Jingsong, Hu Anwen, Li Fei   

  1. Bohai Petroleum Research Institute, Tianjin Branch, CNOOC China Ltd., Tianjin 300459, China
  • Received:2020-12-17 Online:2021-11-26 Published:2021-11-24
  • Supported by:
    Supported by the 13th Five-Year Plan for Oil and Gas Resource Evaluation Project of CNOOC (YXKY-2018-KT-01)

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Abstract: Based on the cluster analysis of crude oil biomarker parameters and the comparison of geochemical characteristics of source rocks of different strata in the Shahejie Formation, the genetic types, sources, and distribution of the crude oil discovered in the South-Central Miaoxi depression of Bohai Sea were analyzed. The results show that there are three main genetic types of crude oil. Type Ⅰ comes from the Third Member of Shahejie Formation(Es3), and mainly distributed in Kenli 6-4 and Penglai 25 areas. It can be further divided into two sub-categories, Ⅰ1 and Ⅰ2, which correspond to high-maturity Es3 crude oil and low-maturity Es3 crude oil. Type Ⅱ mainly comes from the source rocks of Es3 and Es4, and mainly distributed in Penglai 31 area. Type Ⅲ mainly comes from the source rocks of Es4 with a small amount of source rocks of Es3, and mainly distributed in Bozhong 36 area. The geochemical characteristics and distribution regularity of crude oil indicate that the study area is characterized by near-source reservoir formation. Based on the analysis of distribution characteristics of source rocks and fault activity, it is considered that the types and distribution of crude oil in Penglai 25 and Kenli 6-4 areas are mainly controlled by source rocks, while the types and distribution of crude oil in Penglai 31 and Bozhong 36 areas are controlled by both faults and source rocks.

Key words: oil source correlation, cluster analysis, source-break coupling, Bohai Bay basin

CLC Number: 

  • P618.13
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