东北石油大学学报2026，Vol.50Issue(1)：33-46,62,15.DOI:10.3969/j.issn.2095-4107.2026.01.003
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
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 accumula-tion,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 terrig-enous detritus,which favored organic matter preservation and provided a foundation for its accumula-tion.The w(Ni)/w(Al),w(Cu)/w(Al),and w(P)/w(Ti)values show positive excursions in the bot-tom,middle,and upper-middle layers,correlating well with w(TOC)variations,indicating that paleo-productivity 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 Areaofthe Liao-he 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/paleoproductivi-ty/Es4 Member/Leijia Area/Liaohe Depression分类
能源科技引用本文复制引用
丰玉涣,马成龙,张英杰..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[J].东北石油大学学报,2026,50(1):33-46,62,15.基金项目
国家自然科学基金项目(42472217) （42472217）
