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Origin and Geochemical Characteristics of Ordovician Oils from Tazhong Uplift
Author(s): 
Pages: 732-739
Year: Issue:  4
Journal: Acta Sedimentologica Sinica

Keyword:  塔里木盆地塔中奥陶系原油来源;
Abstract: 塔中奥陶系的油气资源十分丰富,是塔里木盆地油气勘探的重点层系之一,但油源仍是困扰地质勘探家的重要问题.通过系统分析塔中奥陶系原油的地球化学特征,进行了原油族群划分和油源判识.原油以轻质油为主,轻烃分析表明,原油没有发生大量裂解,原油的生成温度介于115~129℃,表明其主体成分形成于生油窗阶段.运用特征性生物标志物系统分析表明,原油可分为三个族群,分别来源于中-上奥陶统源岩、寒武系源岩及混合来源....
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