Tectonic-lithofacies palaeogeographic reconstruction of the Yangtze Craton of the Ediacaran Doushantuo Formation and its oil and gas significance
Zhou Xiao-Feng1,2, Yang Feng-Li1,2, Yang Rui-Qing2, Kou Xiao-Hu3, Zhuang Yuan2
1 State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China; 2 School of Ocean and Earth Science,Tongji University,Shanghai 200092,China; 3 Institute of Geological Survey,China University of Geosciences(Wuhan),Wuhan 430074,China
Abstract：Recently,great breakthroughs have been obtained in shale gas exploration in the Ediacaran Doushantuo Formation in the Yangtze Craton. Thus,the tectonic-lithofacies palaeogeography of the Yangtze Craton during the Doushantuo depositional period was in urgent need to be further studied. Based on a large number of outcrop sections,latest drilling data,numerous previous studies,we reconstructed the tectonic-lithofacies palaeogeography of the Yangtze Craton. The results indicated that,during the Ediacaran Doushantuo Period,the tectonic background of the Yangtze Craton was not only controlled by its palaeogeographic location(at the northwest of the supercontinent Rodinia),but also by the thermal sedimentation after the continental rifting. The tectonic-lithofacies palaeogeography of the Yangtze Craton generally showed higher terrain in the west and the north,and lower in the east and the south,with four oldlands developed namely the Hannan,Kangdian,Niushoushan and Jiangnan oldlands. The sedimentary pattern was featured by three platforms(in the Upper Yangtze,Middle-Lower Yangtze,and northern Zhejiang regions)alternated with four basins(in the Wanyuan-Dazhou,west Hubei-Hunan,southeastern and northern Yangtze margins). The three platforms were dominated by restricted-open platform facies; the four basins were dominated by platform margin slope,shelf and bathyal facies. The four oldlands(provided the main detrital provenance),together with the syn-depositional faults and the palaeostructure of the underlying rift basins,controlled the tectonic-sedimentary characteristics of the Yangtze Craton during the Ediacaran Doushantuo Period. The paper has proposed that the southern Shaanxi,northeastern Sichuan,western Hubei,and the adjacent area of the Hunan,Guizhou and Chongqing are the most favorable distribution areas of the Doushantuo source rocks;the northern Zhejiang and southern Anhui areas are the secondary favorable distribution areas. These favorable distribution areas and their adjacent areas are considered to be favorable regions for deepening the deep natural gas exploration in the Yangtze Craton.
Zhou Xiao-Feng,Yang Feng-Li,Yang Rui-Qing et al. Tectonic-lithofacies palaeogeographic reconstruction of the Yangtze Craton of the Ediacaran Doushantuo Formation and its oil and gas significance[J]. JOPC, 2020, 22(4): 647-662.
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