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地球学报  2009 

藏北羌塘盆地胜利河油页岩干酪根特征及碳同位素指示意义

DOI: 10.3975/cagsb.2009.05.10

Keywords: 羌塘盆地,胜利河油页岩,干酪根,碳同位素

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Abstract:

胜利河油页岩位于北羌塘盆地南部,走向长超过34km,宽9km。笔者对该油页岩各岩系干酪根进行了分离、镜鉴、元素分析和碳同位素分析,结果表明,该油页岩干酪根为Ⅱ型干酪根,油页岩中干酪根含量较高,介于15.79%~20.37%,具有富氢少氧的特征,其H/C和O/C比率分别为1.11~1.19和0.08~0.25,为胜利河地区非常好的烃源岩。油页岩层干酪根13C相对富集,具有相对较高的δ13CPDB值(-20.79‰~-21.78‰),与胜利河地区油页岩母源为较单一的藻类有关。藻类的大量繁殖造成了该类生物死亡埋藏速率远大于氧化速率,在还原环境下大部分藻类还未被氧化就被埋藏,从而保留了原始藻类略富13C的特征。胜利河油页岩的空间展布以及规模明显受古泻湖环境的控制。

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