Forming environment and development model of high-quality marine shale: A case of the Wufeng-Longmaxi Formations shale in Zigui-Xintan section in the Middle Yangtze region
Han Jing1, Cai Quan-Sheng2, Li Yang3, Li Xu-Wen1
1 Exploration Company,SINOPEC,Chengdu 610041,China; 2 Wuhan Institute of Geological and Mineral Resources,China Geological Survey,Wuhan 430205,China; 3 Exploration and Development Research Institute,PetroChina Southwest Oil & Gas Field Company,Chengdu 610041,China
Abstract：This paper analyzes the forming environment of high-quality marine shale in the Ordovician Wufeng Formation and the Lower Silurian Longmaxi Formation in the Zigui-Xitan section in the Middle Yangtze region from the aspects of paleo-salinity,palaeoclimate,paleo-productivity,sea area closure and REDOX conditions by using geochemical and petrologic methods,and discusses the controlling factors and development model of high-quality marine shale. The results show that: The high-quality shale of the Wufeng-Longmaxi Formations in the Middle Yangtze region is mainly siliceous shale,which is mainly developed from the Wufeng Formation to the bottom of Aeronian;High-quality shale is mainly formed in the anoxic environment with warm and humid palaeoclimate,low salinity to normal salinity and weakly enclosed to semi-enclosed conditions,and it has a high paleo-productivity. The development of marine high-quality shale is a comprehensive result of multiple factors including tectonic activities,sea-level change and terrigenous-biological siliceous supply,and After Aeronian,the Yangtze plate continuously moved northwestward and sea area reduced,causing a rapid decrease of autogenous siliceous materials and increase of terrigenous clasts. Consequently,high-quality marine shale no longer existed. Finally,the development model of high-quality marine shale is summarized.
Han Jing,Cai Quan-Sheng,Li Yang et al. Forming environment and development model of high-quality marine shale: A case of the Wufeng-Longmaxi Formations shale in Zigui-Xintan section in the Middle Yangtze region[J]. JOPC, 2019, 21(4): 661-674.
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