许婷;许锋;郭玉华;王宁;谢青;黄薇;

• 1:陕西省矿产地质调查中心

• 2:陕西省地质调查院

• 3:西安长庆科技工程有限责任公司

摘要(Abstract)：

根据有机碳质量分数、碳同位素、热演化程度和生物标志化合物等资料,分析陕南西乡—镇巴地区下古生界龙马溪组与牛蹄塘组页岩有机地球化学特征,探讨两套页岩的生烃潜力、有机质沉积环境及母质来源。结果表明:研究区两套页岩有机质质量分数高,为优质烃源岩;有机质类型好,主要为生烃能力强的Ⅰ型;成熟度高,为过成熟裂解生气阶段,具有良好的生烃潜力,且牛蹄塘组较龙马溪组生烃能力更强。生物标志化合物参数中低Pr/Ph、高伽马蜡烷/C30藿烷反映水体盐度较高,形成的缺氧强还原环境是有机质得以保存的重要条件。两套页岩的有机质母质输入主要为细菌和藻类等低等水生生物,其中细菌生源的贡献更大,藻类生源也占较大的比例;规则甾烷的优势分布特征、有机碳同位素及C27/C29表明两套页岩在生源构成上有一定的差异,其中龙马溪组以代表浅海环境C27甾烷占优势的浮游藻类为主,牛蹄塘组以代表半深水—深水环境C29甾烷占优势的浮游绿藻输入为主。

关键词(KeyWords)：西乡—镇巴地区;牛蹄塘组;龙马溪组;页岩;生烃潜力;沉积环境;生物来源

Abstract:

Keywords:

基金项目(Foundation):国家自然科学基金项目(41472108);; 陕西省公益性地质调查专项项目(20170104)

作者(Author):许婷;许锋;郭玉华;王宁;谢青;黄薇;

Email:

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