中国石油大学学报（自然科学版）2025，Vol.49Issue(3)：73-83,11.DOI:10.3969/j.issn.1673-5005.2025.03.008
鄂尔多斯盆地中部地区长7页岩有机质的供源特征
Origin characteristics of organic matter in Chang 7 Member shale in central Ordos Basin
摘要
Abstract
Research on the characteristics and origin of organic matter in Chang 7 shale in central Ordos Basin remains limited,and little attention has been paid to analyzing its sources and respective contributions.In this study,based on core observations,field emission scanning electron microscopy,and organic geochemical analyses,a systematic investigation was conducted on the or-igin and characteristics of organic matter in the Chang 7 shale in the central Ordos Basin.The results indicate that the types of or-ganic matter present in the study area include Type Ⅰ,Type Ⅱ1,and Type Ⅱ2,with Type Ⅱ1 and Type I being dominant.The total organic carbon content ranges from 1.20%to 6.66%,with an average of 3.21%.The organic matter is mainly composed of bitu-men and amorphous components,with bitumen showing higher organic carbon content than the amorphous fraction.The organic matter in lacustrine shale is sourced from both aquatic(lake-derived)and terrestrial(land-derived)inputs.Common lake-derived sources include peloids,algal spores,fish fragments,and scales,while plant debris is the primary land-derived source.In the study area,lake-derived organic matter is more abundant than land-derived material.Although terrestrial input may dilute the o-verall abundance of organic matter,in some samples it may also enhance organic matter enrichment.However,terrestrial organic matter,which is typically rich in hydrogen-poor humic components,generally leads to a reduction in the hydrogen index.关键词
有机质/来源特征/长7段/湖相页岩/鄂尔多斯盆地Key words
organic matter/origin characteristics/Chang 7 Member/shale/Ordos Basin分类
石油、天然气工程引用本文复制引用
范柏江,陈磊,师良,戴欣洋,王驰..鄂尔多斯盆地中部地区长7页岩有机质的供源特征[J].中国石油大学学报（自然科学版）,2025,49(3):73-83,11.基金项目
国家自然科学基金项目(42202160) （42202160）
陕西省自然科学基础研究计划项目(2023-JC-YB-277) （2023-JC-YB-277）
