【摘要】 对羌塘盆地东湖地区上侏罗统白龙冰河组进行系统采样、有机岩石学及有机地球化学分析研究的结果表明,白龙冰河组灰岩沉积于碳酸盐台地环境,有机碳含量在0.11%～0.43%之间,有机质类型为Ⅱ型,母质主要来源于藻类及部分高等植物的输入,有机质镜质组反射率(Ro)在1.5%左右。生物标志化合物组成分布特征显示,白龙冰河组有机质沉积于分层的水体且底部水体盐度较高。更多还原

【Abstract】 The limestone samples were systematically collected from the Upper Jurassic in Donghu area of the Qiangtang Basin,northern Tibet,China,and analyzed by means of organic petrographic and organic geochemical methods.The results indicate that the limestones of Bailongbinghe Formation were deposited in a carbonate platform environment and have TOC values ranging from 0.11% to 0.43%.The organic matter in these samples are largely composed of algae-derived and a certain terrigenous inputs,which can be attributed to Type Ⅱ kerogen with a moderate oil-generating potential.The vitrinite reflectance data vary between 1.4% and 1.5%.Biomarker compositions suggest that organic matter in the Bailonghe Formation were deposited in a stratified water column with saline bottom water.更多还原