【摘要】 以武威盆地北部儿马湖凹陷武地1井为基础,主要依据暗色泥页岩及细砂岩中主微量元素的组成特征,结合暗色泥页岩生物标志化合物组成及地球化学参数,分析研究区上石炭统靖远组、羊虎沟组和太原组的古沉积环境特征。结果表明:研究区上石炭统时期为典型的温暖湿润气候,水体性质以微咸水-半咸水为主,属弱氧化-弱还原过渡型沉积古环境,泥岩沉积时期古生产力条件良好且其沉积速率较快。在弱氧化-弱还原的水体条件中,较快的沉积速率使大量有机质未氧化而直接被保存在沉积物中,促进了有机质的富集。更多还原

【Abstract】 Based on well Wudi 1 in Ermahu Depression in the north of Wuwei basin, the paleosedimentary environment characteristics of Upper Carboniferous Jingyuan formation, Yanghugou formation and Taiyuan formation in the study area are analyzed mainly according to the composition characteristics of major and trace elements in dark shale and fine sandstone and combined with the composition of biomarkers and geochemical parameters of dark shale.The results show that the upper Carboniferous period in the study area is a typical warm and humid climate.The salinity of water is mainly brackish.The paleodepositional environment of the upper Carboniferous is the transitional condition of from weak oxidation to weak reduction.The paleoproducitivity during the deposition of mudstone is relatively high.Under the water condition of weak oxidation-weak reduction, the rapid deposition rate makes a large amount of organic matter not oxidized but directly preserved in sediments, which promotes the enrichment of organic matter.更多还原