辽河坳陷雷家地区沙四段富有机质页岩沉积环境及有机质聚集影响因素

Depositional environment and controls on organic matter accumulation in the organic-rich shales of the Es4 Member in the Leijia Area, Liaohe Depression

摘要

辽河坳陷雷家地区沙四段发育大量富有机质页岩。采集关键井位的页岩样品,进行总有机碳、主量元素和微量元素测试,分析研究区有机质页岩沉积环境及有机质聚集影响因素。结果表明:研究区沙四段页岩总有机碳质量分数w(TOC)普遍较高,在底部、中部、中上部发育三套w(TOC)高值层段;具有高w(V)/w(Cr)、低w(Mo)和低w(Ti)特点,主要沉积在缺氧、近源粗粒碎屑沉积输入很小的沉积环境中,有利于有机质的保存;w(Ni)/w(Al)、w(Cu)/w(Al)和w(P)/w(Ti)等在沙四段底部、中部、中上部多发生正偏,与w(TOC)的变化趋势具有一致性,古生产力变化是有机质聚集垂向差异的关键因素;w(Al)/w(Ti)与w(P)/w(Ti)、w(Ni)/w(Al)、w(Cu)/w(Al)等变化存在内在联系,湖平面变化影响有机质聚集。该结果为辽河坳陷雷家地区页岩油勘探与开发提供指导。

Abstract

The Es4 Member in the Leijia Area of the Liaohe Depression contains abundant organic-rich shales. To further elucidate the depositional conditions and key controls on organic matter accumulation, this study conducted total organic carbon (TOC), major element, and trace element analyses on shale samples from a key well. The results indicate that the w(TOC) values of the Es4 Member shale are generally high, with three high w(TOC) intervals developed at the bottom, middle, and upper-middle layers. The shale samples exhibit high w(V)/w(Cr) ratios, low w(Mo) concentrations, and low w(Ti) contents, suggesting they deposited in an anoxic environment with limited input of coarse-grained terrigenous detritus, which favored organic matter preservation and provided a foundation for its accumulation. The w(Ni)/w(Al), w(Cu)/w(Al), and w(P)/w(Ti) values show positive excursions in the bottom, middle, and upper-middle layers, correlating well with w(TOC) variations, indicating that paleoproductivity fluctuations are key factors controlling the vertical change of w(TOC) values. Variations in w(Al)/w(Ti) ratios exhibit an intrinsic relationship with w(P)/w(Ti), w(Ni)/w(Al), and w(Cu)/w(Al) trends, implying that lake-level fluctuations also influenced organic matter accumulation. This study provides important insights for shale oil exploration and development in the Leijia Area of the Liaohe Depression.

关键词

富有机质页岩 / 有机质聚集 / 沉积环境 / 古生产力 / 沙四段 / 雷家地区 / 辽河坳陷

Key words

organic-rich shale / organic matter accumulation / depositional environment / paleoproductivity / Es4 Member / Leijia Area / Liaohe Depression

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基金资助

国家自然科学基金项目(42472217)