马朗凹陷芦草沟组烃源岩地化特征

对三塘湖盆地马朗凹陷芦草沟组烃源岩的研究表明:烃源岩中原生成因的矿物沥青基质优势分布,其中有机质可能主要来源于菌藻类物质生物降解;可溶有机质生物标志物组成表现出烃源岩有机质具有陆源高等植物与微生物（菌藻类）混合生源构成的基本特征,富氢组分含量丰富;烃源岩样品的宏观热解特征反映出烃源岩有机质大量成烃的门限温度较高、主生烃峰带窄的特性,类似Ⅰ型干酪根成烃规律;此外该套烃源岩有机质中还含有相当数量的原生类脂物,具有一定低熟生烃能力。

Geochemical Characteristics of Lucaogou Source Rock in Malang Sag, Santanghu Basin

A study of Lucaogou source rock in Malang sag ,S antanghu basin is made.The result shows that1)primary origin of asphaltene a s-sumes predominant distribution in which organic matter could mainly come fro m bio-degradation of thallophyte;2)the biomarker composition in soluble orga nic matter appears to be of general feature of mixed sources from both terrigeno us higher plant and microorganism(thallo-phyte),with abundant hydrogen com position;3)the sample of source rock reflects the characters of macroscopic p yrolysis with higher oil threshold temperature and narrower major hydrocarbon ge neration zone,similar to the hydrocarbon generation pattern of Type I kerogen. In addition,this source rock organic matter contains considerable amount of pr imary lipids,with a certain of low maturation hydrocarbon-gener-ated potentia ls.