岩性油气藏 ›› 2022, Vol. 34 ›› Issue (5): 7385.doi: 10.12108/yxyqc.20220506
罗锦昌, 田继军, 马静辉, 闫嘉启, 梁雅菲, 胡卓浩
LUO Jinchang, TIAN Jijun, MA Jinghui, YAN Jiaqi, LIANG Yafei, HU Zhuohao
摘要: 通过X射线衍射、有机碳测试、主微量元素测试和饱和烃色谱等分析对吉木萨尔凹陷二叠系芦草沟组烃源岩的古环境、古生产力及其有机质富集机理进行了研究。研究结果表明:①吉木萨尔凹陷吉页1井区二叠系芦草沟组烃源岩主要为长英质混合细粒沉积岩和黏土质混合细粒沉积岩,有机质来源包括陆源有机质和海相藻类,其中海相藻类贡献较大;芦一段TOC值平均为5.93%,芦二段TOC值平均为5.69%。②研究区岩样中Ba元素含量较高,平均质量分数为12 052.89×10-6;烃源岩正构烷烃多呈单峰型,芦一段主峰碳为C17和C19,具有较弱的奇碳优势,芦二段主峰为主峰碳为C19,具有奇碳优势,整体类异戊二烯烃中Pr和Ph含量丰富。③研究区整体为干旱-咸化还原沉积背景,芦一段沉积期为干旱气候,古水体较浅,古盐度较高,水体分层形成稳定的还原环境,古生产力比芦二段强;芦二段沉积期为半潮湿—半干旱气候,古水体较深,古盐度较低,还原环境好。④研究区烃源岩有机质富集受控于陆源碎屑供给、古生产力和古气候等因素,还原环境稳定,是典型的“生产力富集模式”,古气候、古盐度和陆源碎屑的影响导致芦二段TOC含量较低。
中图分类号:
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