四川盆地元坝地区上二叠统长兴组烃源岩地球化学特征研究

The Geochemical Characteristics of Source Rocks in Changxin Formation of Upper Permian in Yuanba Area of Sichuan Basin

根据有机质丰度、族组成、饱和烃气相色谱和生物标志物等指标,分析了四川盆地元坝地区上二叠统长兴组烃源岩地球化学特征。研究表明,元坝地区上二叠统长兴组烃源岩有机质丰度较高,有机质类型以Ⅲ型有机质为主,沉积环境为还原环境;烃源岩处于成熟阶段,主要来源为海相物质,同时,陆源物质也有一定贡献。总体来说,四川盆地元坝地区上二叠统长兴组烃源岩是有效烃源岩,具有一定生烃潜力。

Based on the organic matter abundance,group composition,saturated hydrocarbon gas chromatography,biomarkers,the article analyzes the geochemical characteristics of source rocks in Changxin Formation of Upper Permian in Yuanba Area of Sichuan Basin.Research shows that the organic matter abundance of source rocks in Changxin Formation of Upper Permian in Yuanba Area is high,the organic matter type is TypeⅢ.The source rocks in Changxin Formation are in reducing environment.The source rocks are at the mature stage.The main source is from marine environment.In general,the source rock of Changxing Formation in Yuanba Area in Sichuan Basin is effective source rock,it has certain hydrocarbon generation potential.