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大港油田奥陶系碳酸盐岩含有丰富的支链烷烃化合物，特别是高碳数单甲基高位取代支链烷烃，主要反映了该套碳酸盐岩的蓝菌类生物质输入。
Ordovician carbonates in Dagang Oilfield are rich in branched alkanes, especially high carbon monomethyl substituted branched alkanes, which mainly reflect the input of cyanobacterial biomass of the carbonate rocks.