三塘湖盆地上二叠统芦草沟组烃源岩地球化学特征  

Characteristics of Organic Geochemistry of Lucaogou Formation Source Rocks,Upper Permian,Santanghu Basin

作　　者：王作栋[1] 陶明信[2] 梁明亮[1,3] 余水生[4] 李中平[1] 徐永昌[1] 

机构地区：[1]中国科学院地质与地球物理研究所油气资源研究重点实验室,兰州730000 [2]北京师范大学资源环境学院地表过程与资源生态国家重点实验室,北京100875 [3]中国科学院研究生院,北京100049 [4]吐哈油田公司勘探开发研究院,新疆哈密839009

出　　处：《沉积学报》2012年第5期975-982,共8页Acta Sedimentologica Sinica

基　　金：国家自然科学基金项目(批准号:41072106)资助

摘　　要：三塘湖盆地上二叠统芦草沟组分布面积广、厚度大、有机碳含量高,具好的生烃潜力,是盆地内主力烃源岩。烃源岩样品可溶有机质中含有丰富的脂肪酸、脂肪酸酯等含羰基化合物,随着埋深增加,饱和烃和芳烃含量递增,非烃含量和有机碳则呈递减趋势,表明含羰基化合物对源岩生烃有较大的贡献。饱和烃的各项指标显示,烃源岩的沉积环境为咸化湖相还原环境,母质输入以水生生物为主,陆源物质输入较少。诸多证据表明,在沉积初期和成岩早期细菌输入较多,细菌输入有机质构成了原始有机质的一部分,细菌改造原始有机质并产生前述含羰基化合物,在热作用和微生物作用下均可成烃。Upper Permian Lucaogou Formation of Santanghu Basin with a wide distribution, large thickness, high or- ganic carbon content, and good hydrocarbon potential, was the main source rocks in the basin. Soluble organic matter from rock samples contains rich carbonyl compounds such as fatty acids, fatty acid esters, etc. Saturated hydrocarbons and aromatics content increasing along with the depth increase, but non-hydrocarbon content and organic carbon de- creasing, showed these carbonyl compounds in the source rocks have made a greater contribution to hydrocarbon gen- eration. The indicators of saturated hydrocarbon showed that the depositional environment of source rocks was the sa- linity lake, reduction conditions. The input of the parent material dominated by aquatic organisms, terrestrial input less. A lot of evidence indicated that bacteria entered the organic matter deposition during the early diagenesis stages and formed part of the original organic matter; bacteria transformed the original organic matter and produced the afore- mentioned carbonyl compounds, hydrocarbons could be generated in the thermal effect and affection of micro-organ- isms.

关 键 词：芦草沟组 烃源岩 地球化学特征 羰基化合物 生烃 

分 类 号：P593[天文地球—地球化学]