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.
Fund:Co-funded by the National Science and Technology Major Project(Nos. 2017ZX05036,2017ZX05005),and the Hubei Provincial Natural Science Foundation of China(No.2018CFB330)
Corresponding Authors:
About the corresponding author Cai Quan-Sheng,born in 1988,Ph.D.,is an engineer of the Wuhan Institute of Geological and Mineral Resources,China Geological Survey. He is mainly engaged in researches on sedimentary geology and basic geological survey of shale gas. E-mail: cqsh0713@163.com.
About author: About the first author Han Jing,born in 1988,Ph.D., is an engineer of the Exploration Company,SINOPEC. He is mainly engaged in researches on sedimentary reservoirs and shale gas geology. E-mail: ftd_hanjing@163.com.
Cite this article:
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.
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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