鄂尔多斯盆地延长探区山西组泥页岩沉积地球化学特征及有机质保存条件分析Sedimentary Environment and Preservation Conditions of Organic Matter Analysis of Shanxi Formation Mud Shale in Yanchang Exploration Area,Ordos Basin
赵帮胜;李荣西;王香增;吴向阳;王宁;覃小丽;程敬华;李佳佳;
摘要(Abstract):
通过主量元素和微量元素分析,应用沉积地球化学方法对采自于鄂尔多斯盆地中部两口页岩气探井的泥页岩沉积地球化学特征和有机质保存条件进行了研究。结果表明:1化学蚀变指数(CIA)和Sr/Cu比值反映本区山西期为温湿气候,Rb/Zr比值反映本区山西组泥页岩沉积水体较浅;2w(Th)-w(Zr)、w(Th)-Y/Ho相关性图解以及Y/Ho比值更接近于陆源碎屑物质,表明本区山西组泥页岩沉积时主要来源为陆源碎屑物质;3V/Cr比值、V/(V+Ni)比值、δU和Th/U比值表明山西组泥页岩形成于以弱还原环境为主的弱氧化-弱还原环境;4Sr/Ba和TOC/S比值反映本区山西组沉积水体以淡水为主,并兼有少量混合水;5地球化学综合分析表明,山西组泥页岩沉积水体富氧,缺少有机质保存的还原条件,有机质被氧化分解,不利于后期生烃。
关键词(KeyWords): 鄂尔多斯盆地;泥页岩;沉积环境;主量元素;微量元素;保存条件
基金项目(Foundation): 国家自然科学基金项目(41173055)
作者(Author): 赵帮胜;李荣西;王香增;吴向阳;王宁;覃小丽;程敬华;李佳佳;
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DOI:
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