In order to discuss the relationship between sedimentary enviroment and organic matter accumulation in black shale of Middle Ordovician Shengping Formation,the Xishuiyuan Section in Wenqiao Town,Quanzhou County,northern Guangxi was chosen. The organic carbon content,kerogen carbon isotope,major and trace elements were analyzed to investigate paleo-redox,paleo-productivity,hydrothermal sedimentation,clastic influx and water limitation of the Middle Ordovician sedimentary environment in the northern Guangxi. The results show that the lower member of Shengping Formation is mainly composed of mud-rich siliceous shale with TOC of 1.45％-3.04％,and the upper member is mainly composed of siliceous shale with TOC of 0.63％-2.69％. The source of organic matter in the lower member of Shengping Formation is mainly type Ⅰ kerogen,while the source of organic matter in the upper member may be type Ⅱ kerogen in addition to type Ⅰ kerogen. The sedimentary period of Shengping Formation in northern Guangxi is a suboxic and anoxic deep-water shelf and basin facies environment. The organic matter accumulation of mud-rich siliceous shale is a dual control pattern of productivity and preservation conditions. The organic matter accumulation of siliceous shale is a preservation condition pattern.
black shalesedimentary environmentorganic matter accumulationShengping Formationnorthern Guangxipetroleum geology
维普
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