吉林大学学报(地球科学版) ›› 2021, Vol. 51 ›› Issue (6): 1665-1677.doi: 10.13278/j.cnki.jjuese.20200308

• 地质与资源 • 上一篇    下一篇

渤海湾盆地庙西中南洼围区原油成因类型及分布主控因素

孙哲, 于海波, 彭靖淞, 胡安文, 李飞   

  1. 中海石油(中国)有限公司天津分公司渤海石油研究院, 天津 300459
  • 收稿日期:2020-12-17 出版日期:2021-11-26 发布日期:2021-11-24
  • 作者简介:孙哲(1989-),男,工程师,主要从事油气勘探与综合评价方面的研究,E-mail:sunzhe6@cnooc.com.cn
  • 基金资助:
    中海油"十三五"油气资源评价项目(YXKY-2018-KT-01)

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)

摘要: 通过原油生物标志化合物参数聚类分析,在对比沙河街组不同层系烃源岩地化特征的基础上,分析了渤海海域庙西中南洼已发现原油的成因类型、来源及其分布规律。结果表明,研究区目前已发现的原油主要有Ⅰ型、Ⅱ型和Ⅲ型3种成因类型,其中:Ⅰ型原油来源于沙三段烃源岩,主要分布在垦利6-4区和蓬莱25区,其进一步可分为Ⅰ1和Ⅰ2两个亚类,分别对应中高熟沙三型原油和中低熟沙三型原油;Ⅱ型原油来源于沙三段和沙四段烃源岩,主要分布在蓬莱31区;Ⅲ型原油主要来源于沙四段烃源岩,可能有少量的沙三段烃源岩贡献,主要分布在渤中36区。原油地化特征及分布规律指示研究区为近源成藏特征。综合烃源岩分布特征及断层活动性分析认为蓬莱25区和垦利6-4区原油类型主要受烃源岩控制,而蓬莱31区和渤中36区原油类型和分布受断裂和烃源岩联合控制。

关键词: 油源对比, 聚类分析, 源断耦合, 渤海湾盆地

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

中图分类号: 

  • P618.13
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