石油实验地质Issue(4)：479-486,510,9.DOI:10.11781/sysydz201404479
廊固凹陷古近系沙河街组古湖泊环境与有机质富集机制
Palaeolake environment and organic matter enrichment mechanism of Paleogene Shahejie Formation in Langgu Sag
摘要
Abstract
According to the analyses of element geochemistry, organic geochemistry and isotope geochemistry of mud-stone samples from the 4th member (Es4) and the lower subsection of the 3rd member (Es3) of the Shahejie Forma-tion in the Langgu Sag, combined with the characteristics of lake evolution and climate change, it was discussed in this paper the changes of salinity, redox condition and productivity as well as the enrichment mechanisms of organic matter. During the formation stage (Es4), the lake was deposited in an inactive tectonic activity with arid climate, brackish water, stable water column stratification, water bottom anoxia and lower enrichment of organic matter. When the lake developed to the peak stage ( the lower subsection of Es3 ) , the basin subsided strongly with hu-mid climate, fresh water and weak reducing environment in the bottom water. The productivity of surface water was high triggered by a great quantity of nutrients inflowed by direct runoff. The enrichment of organic matter in lacustrine sedimentation was controlled by the productivity and redox conditions during different lake evolution stages. In Es4 , the enrichment of organic matter was mainly controlled by the anoxic environment in the bottom water, while in the lower subsection of Es3 , it was closely related to the high productivity of surface water.关键词
氧化还原条件/古生产力/有机质富集/古湖泊/廊固凹陷/渤海湾盆地Key words
redox condition/paleoproductivity/enrichment of organic matter/palaeolake/Langgu Sag/Bohai Bay Basin分类
能源科技引用本文复制引用
刁帆,金凤鸣,郝芳,孙冶华,邹华耀,王元杰,张金峰,操义军..廊固凹陷古近系沙河街组古湖泊环境与有机质富集机制[J].石油实验地质,2014,(4):479-486,510,9.基金项目
中国石油天然气股份有限公司科技项目（2011D-0703）和国家科技重大专项“大型油气田及煤层气开发”（2011ZX05006）共同资助。 （）
