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陆东凹陷上侏罗统九佛堂组生油岩的地化分析资料表明，其生物标志物的组成和分布与沉积环境的水介质条件和氧化还原性密切相关。以广发背斜带为界，凹陷西部生油层中正构烷烃在Ｃ１５～Ｃ１９呈明显的奇偶优势；类异戊二烯烃异常丰富，Ｐｒ／Ｐｈ大多小于０．５；缺少重排二环倍半萜烷和重排甾烷；富含伽马蜡烷和胡萝卜烷及Ｌｅｘａｎｅ化合物；芳烃中有较高的脱羟基维生素Ｅ系列，表征微咸水强还原的沉积环境。凹陷东部生油岩中的Ｐｒ／Ｐｈ多大于１．０；富含重排甾、萜类化合物；少含伽马蜡烷和胡萝卜烷系列化合物，反映弱氧化淡水沉积环境。
The geochemical analysis of source rocks of the Upper Jurassic Jiufotang Formation in Luodong Sag indicates that the composition and distribution of biomarkers are closely related to the aqueous medium conditions and redox properties of the sedimentary environment. Taking the Guangfa anticline as a boundary, the n-alkanes in the western depression of the sag show obvious odd-even advantage in C15 ~ C19; the isoprenoid is extremely rich, Pr / Ph is mostly less than 0.5; the lack of rearranged bicyclic sesquiterpenoids Alkanes and rearrangement steranes; rich in gamma-carbinol and carotenoids and Lexane compounds; aromatics have higher dehydroxyvitamin E series, characterizing the strong reduction of brackish water sedimentary environment. The Pr / Ph in the source rocks of the eastern sag is more than 1.0. It is rich in rearrangement steroids and terpenoids, and contains less gamma-alkanes and carrot alkanes, reflecting the depositional environment of weakly oxidized fresh water.