羌塘盆地角木茶卡地区二叠系古油藏的发现及基本特征

The Discovery and Basic Characteristics of Ancient Reservoir in Permian of Jiaomuchaka Area,Qiangtang Basin

首次在羌塘盆地中央隆起带内角木茶卡地区发现一处二叠系古油藏,该古油藏具重要研究价值。本文在分析了该古油藏的基本特征及油气显示类型之后,对含油白云岩和可能的烃源岩进行对比性有机地球化学研究。结果表明,含油白云岩与龙格组泥晶灰岩和展金组粉砂质泥岩的饱和烃正构烷烃构成曲线及参数存在显著差异,两者甾、萜烷生物标志化合物的组合、分布特征不同。因此,含油白云岩中的烃类可能并非来源于其相邻层位的泥晶灰岩和粉砂质泥岩。

The Permian ancient reservoir was found for the first time in jiaomuchaka area,in the central uplift belt of qiangtang basin,it has important research value. Based on the analysis of the basic features and oil and gas display type of the ancient reservoir,reserched the hydrocarbon source rocks of oil dolostone and possible comparative organic geo-chemical. The results showed that the curve constituted of the oil dolomite and runge micrite and saturated hydrocarbon n-alkanes of Zhanjin group silty mudstone and its parameters was significant differences,both the combination of the ste-roid,terpane biomarkers compounds,and distribution characteristics are different.Therefore,Oil hydrocarbons in dolomite, may not be derived from its adjacent horizon micrite and silty mudstone.