海洋地质前沿2025，Vol.41Issue(9)：1-13,13.DOI:10.16028/j.1009-2722.2025.064
南海西北部陆缘茂名盆地油页岩沉积地球化学特征及古环境探讨
Sedimentary geochemistry and paleoenvironment of oil shales in the Maoming Basin in the northwestern continental margin of the South China Sea
摘要
Abstract
The global shale oil resources are far more than conventional ones,and the development and utiliza-tion of shale(oil-bearing shale)resources will change the global energy landscape.The oil shale resource reserves in the Maoming Basin,Guangdong,South China,account for 16.72%of the national total,possessing tremendous resource potential.Focusing on the analysis and research of the geochemical characteristics of oil shales in the Eo-cene Youganwo Formation in Maoming Basin.systematic sample collection and analysis on the contents of major and trace elements were conducted,and the sedimentary geochemical characteristics and sedimentary environ-ment were deeply analyzed.Results are:① The oil shales of the Youganwo Formation showed enrichment in Al2O3 and Fe2O3 relative to the average value of the upper continental crust(UCC)but deficient in MgO,Na2O,P2O5,MnO2;② During the sedimentation,the parent rock of the oil shales was subjected to strong chemical weathering,which caused exchange of potassium in clay minerals.However,some high field strength elements and rare earth elements were less affected by chemical weathering.The effect of sediment recycling on the geo-chemical properties of oil shale sedimentation was relatively small;③ The provenance was consisted of interme-diate acidic igneous rocks between granite and granodiorite in lithology similar to the Precambrian tonalite as-semblage(TTG)in chemical composition.The Maoming oil shales were deposited in a warm and humid climate in lake water with low salinity and strong stratification.The bottom water was in a reducing environment,which was conducive to the enrichment and preservation of organic matter;④ The water temperature difference between surface and bottom layers caused lake water stratification,while lake transgression deepened the water,which weakened the influence of wind and rivers on the bottom layer of water and resulted in oxygen deficiency in the bottom layer,providing favorable conditions for the enrichment and preservation of organic matter and the forma-tion of the oil shales.关键词
茂名油页岩/始新统油柑窝组/地球化学特征/物源/古环境Key words
Maoming oil shales/Eocene Youganwo Formation/geochemical characteristics/provenance/pa-leoenvironment分类
海洋科学引用本文复制引用
徐力峰,吴学万,王先庆,何春民..南海西北部陆缘茂名盆地油页岩沉积地球化学特征及古环境探讨[J].海洋地质前沿,2025,41(9):1-13,13.基金项目
国家自然科学基金(42076054) （42076054）
茂名市公共服务项目"茂名市多要素三维城市地质调查项目"(0835-220ZA9303471) （0835-220ZA9303471）
第二十七届中国科协年会学术论文(2025XSJL022) （2025XSJL022）
