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对金湖凹陷40个原油样品进行轻烃组分、Mango参数和成熟度等研究。甲基环己烷指数指示出该凹陷原油的干酪根类型为Ⅰ—Ⅱ型;C5轻烃特征显示有机质来源既有腐泥型也有腐殖型;Mango轻烃参数K1值基本符合轻烃稳态催化动力学轻烃成因模式,暗示着该凹陷原油有着相似的沉积环境;C5—C7轻烃三环优势大于五环和六环优势,表明该地区原油主要来源于湖相沉积环境的烃源岩;原油轻烃组分中的庚烷值和异庚烷指数都较低,原油成熟度低,原油形成温度在120～128℃之间。为进一步认识金湖凹陷原油和烃源岩的地球化学特征提供科学依据。
40 crude oil samples from Jinhu Sag were studied for light hydrocarbon components, Mango parameters and maturity. Methylcyclohexane index indicates that the kerogen type is Ⅰ-Ⅱ. The characteristics of C5 light hydrocarbon indicate that the source of organic matter is both sapropelic and humic. K1 value of Mango light hydrocarbon is basically consistent with the light hydrocarbon homeostasis The catalytic kinetics of light hydrocarbon genesis indicates that the sag crude oil has a similar depositional environment. The advantage of C5-C7 light hydrocarbon tricyclics is greater than that of pentacyclic and hexacyclics, indicating that the crude oil in this area mainly comes from the source rocks of lacustrine sedimentary environment ; Light crude oil components heptane and heptane Heptane index index are low, low crude oil, crude oil formation temperature between 120 ~ 128 ℃. This will provide a scientific basis for further understanding of geochemical characteristics of crude oil and source rock in Jinhu Sag.