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
孙哲, 于海波, 彭靖淞, 胡安文, 李飞
Sun Zhe, Yu Haibo, Peng Jingsong, Hu Anwen, Li Fei
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。
中图分类号:
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