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为了揭示煤系与湖相烃源岩有机地球化学特征及成因差异,采用沉积与有机地球化学相结合的方法,综合对比了抚顺盆地始新统烃源岩的沉积环境、有机质类型、丰度和生物标记化合物参数,认为不同沉积环境中水体性质、有机质来源、生产率和保存条件的差异造成有机地球化学特征的改变.结果表明:古城子组烃源岩具有总体大于10%的TOC(总有机碳)和小于5%的饱和烃含量,生物标记化合物参数(高Pr+Ph含量和藿烷/甾烷)显示有机质来自淡水沼泽中的高等植物;计军屯组纹层状油页岩和γ-蜡烷表明湖泊水体的加深和咸化,水生有机质增加和稳定水体分层造成中等-高的TOC和逐渐升高的饱和烃含量;西露天组烃源岩具有强烈变化的TOC(0.23%~16.91%)和继承性可溶有机质组分,β-胡萝卜烷指示有机质来自高生产力的浅水、咸化湖泊藻类.因此,沉积环境的改变引起有机质来源和生产率的变化,湖泊水体分层与否控制水体中有机质保存,沉积旋回(短期基准面变化)造成垂向有机质丰度的改变.
In order to reveal the organic geochemical characteristics and genetic differences of coal measures and lacustrine hydrocarbon source rocks, the sedimentary environment, organic matter types, abundance and organic matter of the Eocene source rocks in the Fushun Basin were comprehensively compared with the methods of sedimentary and organic geochemistry The results show that the source rocks of the Guchengzi Formation have TOC (total organic carbon) of more than 10% in total ) And less than 5% of the saturated hydrocarbon content. Biomarker parameters (high Pr + Ph content and hopane / sterane) showed that the organic matter came from higher plants in the freshwater marsh; tuftshaped tuff oil shale and γ- The waxy alkaloids indicate deepening and salinization of lake water bodies, increase of aquatic organic matter and stratification of stable water body resulting in medium-high TOC and gradual increase of saturated hydrocarbon content. Xiluomang source rock has strongly varying TOC (0.23% ~ 16.91 %) And inherited soluble organic components, β-carotene indicates that the organic matter originates from the high productivity of shallow and salty lake algae. Therefore, the change of sedimentary environment causes the source of organic matter Rate changes, lake water control stratification of the water or not preservation of organic matter, deposition cycle (short base change) cause a change in the vertical organic abundance.