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柴达木盆地北缘侏罗系烃源岩分为泥岩、炭质泥岩、煤和油页岩4种类型,不同类型烃源岩的生烃性能、生物标志物分布特征具有明显的差别,侏罗系沉积相分布对有效烃源岩有明显的控制作用。通过原油、烃源岩生物标志物地球化学特征对比,揭示出冷湖三号、南八仙部分原油和马北油田原油来源于母质类型较好的腐泥型烃源岩,这类优质烃源岩主要为中侏罗统上部泥岩和油页岩,主体分布在赛什腾凹陷和鱼卡凹陷,围绕这类优质烃源岩分布的有利勘探区,应主要分布在马仙断裂以北临近优质烃源岩的地区,以及冷湖六号、冷湖七号构造带。
The Jurassic hydrocarbon source rocks in the northern margin of the Qaidam Basin are divided into four types: mudstone, carbonaceous mudstone, coal and oil shale. The hydrocarbon generation performance and biomarker distribution characteristics of different types of source rocks have obvious differences. The sedimentary facies distribution of the Luo system has obvious control over the effective source rocks. The geochemical characteristics of crude oil and source rock biomarkers reveal that some crude oil from Lenghu III, Nanbaixian and Mabei are derived from sapropelic source rocks with good parental types. Such high-quality source rocks Mainly in the upper Middle Jurassic mudstone and oil shale, the main distribution in the Seth Teng depression and the Yuka depression, around the favorable source rock distribution of these favorable exploration areas should be mainly distributed in the north of the Ma Xian fault near the high-quality hydrocarbons Source rock area, as well as cold lake on the 6th, cold lake structural belt 7.