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借助于Rock -Eval生油岩评价仪、色谱 -质谱、稳定同位素质谱仪、显微镜等分析测试手段 ,对柴达木盆地东部地区侏罗系烃源岩进行了地球化学特征分析。从有机碳含量、可溶有机质含量及其转化率、热解参数、饱和烃的生物标志化合物特征、有机岩石学特征和饱和烃单体烃碳同位素分布特征几个方面综合分析了侏罗系烃源岩的有机质丰度、类型和成熟度 ,并对其生烃潜力进行了评价。结果表明 :(1 )侏罗系烃源岩有机碳含量高 ,多数样品属中等～好的生油岩范畴。 (2 )有机质类型多为Ⅲ型 ,少数为Ⅰ型和Ⅱ型。 (3)有机质处于低熟 -成熟阶段。 (4)烃源岩多为来源于高等植物的滨浅湖相和沼泽相沉积 ,具有煤系烃源岩的特点。 (5 )部分地区的生烃潜力较大
The geochemical characteristics of Jurassic source rocks in eastern Qaidam basin were analyzed with the help of Rock-Eval oil-bearing rock evaluation instrument, chromatographic-mass spectrometry, stable isotope mass spectrometer and microscope. Based on the organic carbon content, soluble organic matter content and its conversion rate, pyrolysis parameters, biomarker characteristics of saturated hydrocarbons, organic petrologic characteristics and hydrocarbon carbon isotope distribution characteristics of saturated hydrocarbon monomer, Source rock organic matter abundance, type and maturity, and its hydrocarbon potential was evaluated. The results show that: (1) The organic carbon content of Jurassic source rocks is high, and most of the samples belong to medium-good source rocks. (2) The organic matter types are mostly type Ⅲ, a few are type Ⅰ and type Ⅱ. (3) organic matter in low maturity - maturity stage. (4) Most of the source rocks are sedimentary facies of lacustrine and lacustrine facies derived from higher plants and have the characteristics of coal-bearing source rocks. (5) Hydrocarbon generation potential in some areas is larger