华南地质2025，Vol.41Issue(4)：715-725,11.DOI:10.3969/j.issn.2097-0013.2025.04.003
羌塘盆地刻莫地区早石炭世杂多群烃源岩元素地球化学的沉积环境指示意义
Sedimentary Environment Implications of Element Geochemistry in Early Carboniferous Duomuo Formation Source Rocks from the Kemo Area,Qiangtang Basin
摘要
Abstract
The Carboniferous source rocks in the Qiangtang Basin represent a newly discovered hydrocarbon exploration target layer following the Jurassic series,with their paleoenvironmental characteristics holding significant implications for evaluating petroleum resources.This study systematically analyzed the paleo-water depth,paleoclimate,paleosalinity,and redox conditions during the formation of the Duomuo Formation source rocks using sedimentary geochemical methods based on experimental data of outcrop samples from the Kemo area.The results indicate that these source rocks formed under warm to temperate climatic conditions,exhibiting semi-arid to semi-humid paleoclimatic features.The sedimentary environment was a continental marginal shallow sea(h<200 m),with paleo-water depths ranging from 17.24 to 67.11 m,characterized by freshwater to slightly brackish conditions.The redox state of the water body exhibited a transitional"weakly oxidizing to suboxic"state,with limited and unstable dissolved oxygen levels.These findings not only provide new geochemical evidence for the paleoenvironmental evolution of the Qiangtang Basin but also lay an important foundation for subsequent organic geochemical studies of source rocks,offering critical guidance for assessing the basin's hydrocarbon potential.关键词
沉积地球化学/石炭系烃源岩/古气候/沉积环境/羌塘盆地Key words
sediment geochemistry/Carboniferous source rocks/paleoclimate/depositional environment/Qiangtang Basin分类
天文与地球科学引用本文复制引用
冯兴雷,林家善,万友利,王东..羌塘盆地刻莫地区早石炭世杂多群烃源岩元素地球化学的沉积环境指示意义[J].华南地质,2025,41(4):715-725,11.基金项目
中国地质调查局项目(No.DD202402030) （No.DD202402030）
