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陆东凹陷生油岩生物标志物与沉积环境的关系 预览 被引量:3

Relationship Between Biomaker Composition and Depositional Environment of Source Rocks in Ludong Depression
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摘要 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支广发背斜带为界,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。 Geochemical data of Jiufutang Formation (upper Jurassic) source rocks in Ludong depression, Kailu basin reveals that the composition and distribution of biomakers are related to the water nature and oxidation-reduction of depositional environment. The saturated hydrocarbons of source rock samples from the western part of the depression show n-alkanes distribution with an odd carbon number predominance (C15  ̄C19), abundant isoprenoids (Pr/Ph<0.5 in most samples), absence of rearranged bicyclanes and diasteranes, and high amount of gammacerane and carotenoids. Their aromatic fractions contain relatively high amount of methylated MTTCs. These composition characteristics suggest brackish water and reducing depositional environment. In contrast, the source rocks in the eastern part of the depression have Pr/Ph values of more than 1.0, abundant rearranged bicyclanes, hopanes and diasteranes, and low amount of gammacerane and carotenoids, reflecting oxidic fresh lake depositional environment.
作者 朱扬明等 肖乾华 Zhu Yangming; Zhang Chunming; Zhang Min; Mei Bowen; Jin Diwei(Jianghan Petroleum Institute, Jingsha 434102, China)Xiao Qianhua(Liaohe Petroleum Bureau. Panjin 124010. China )
出处 《江汉石油学院学报》 CSCD 北大核心 1996年第3期 29-34,共6页 Journal of Jianghan Petroleum Institute
关键词 有机地球化学 生物标志物 生油层 沉积环境 organic geochemistry biological marker source bed sedimentary environment Lujiapu seg
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