大港油田奥陶系碳酸盐岩生物标志化合物地球化学特征

Organic Geochemistry of Biomarkers in the Ordovician Carbonates of the Dagang Oilfield

在本项研究中，根据Ｐｒ／Ｐｈ比值、β－胡萝卜烷类化合物丰度、甾／藿比值、单甲基高位取代支链烷烃、ＯＥＰ值、升藿烷Ｃ３１２２Ｓ／（２２Ｓ＋２２Ｒ）比值等参数，对大港油田奥陶系碳酸盐岩的地球化学特征作了详细的研究，认为该套地层沉积于弱氧化－弱还原条件下及经历了强烈的细菌改造。有机质主要为蓝菌类生物质输入。并认为该灰岩处于成熟－高成熟阶段。

In this paper,parameters such as Pr/Ph,β carotanoid compound abundance,steranes/opanes,mono methy1 branched alkanes,OEP value and C 31 22S/(22S+22R)omohopane were used to detailedly study the organic geochemical characteristics of the Ordovician carbonates in the Dagang Oilfield,and it was suggisted that the carbonates were deposited in a weakly oxidizing weakly reducing en vironment and had undergone intense transformation by bacteria.The organic matter in the carbonates is mainly of bluebacterial bio input.And the Ordovician limestones were thought to be at mature highly maturestage.