A study on sedimentary environment evolution model of superimposed foreland basin in western Hunan Province

Abstract

Abstract: The western Hunan Province has experienced two periods of large-scale formation and evolution of foreland basin, i.e. the Nanhua-late Silurian when the marine foreland basin was formed, and the Devonian-Early Cretaceous when the continent foreland basin was formed. As for the sedimentary environment evolution model, the marine foreland basin was formed and evolved through the stages of continental rift clastic rocks, passive continental margin clastic rocks continental shelf–carbonate continental shelf–carbonate platform, early marine flysch in foreland basin, and late marine molasse in foreland basin, with the stage of late continental molasse in foreland basin missing; the stage of late marine molasse in foreland basin is transient, while the stage of early marine flysch in foreland basin is long. The continental foreland basin was formed and evolved through the stages of clastic rock of continental rift extension, carbonate platform–platform basin in passive continental margin, early marine flysch in foreland basin, and late continental molasse in foreland basin, with the stage of late marine molasse in foreland basin missing; the stage of early marine molasse in foreland basin is transient, while the stage of late continental molasse in foreland basin is long. The differences between the two periods are subject to the palaeo-geographical location during tectonic movements. During the former period, the formation of marine foreland basin was controlled by the formation, development and extinction of the Huanan Ocean at the southeast margin, presenting as a marine foreland basin near the passive continental margin. During the later period, the formation of continental foreland basin was controlled by to the formation, development and extinction of the Mianlue Ocean in the north, presenting as a continental foreland basin distant to the passive continental margin. In western Hunan Province, the formation and evolution of the complex superimposed foreland basin reflects the tectonic and sedimentary evolution history of the entire Yangtze platform margin, corresponding to two Wilson cycles.

Key words: foreland basin, passive margin, flysch, molasse, sedimentary environment, western Hunan Province

Li Bin, Luo Qun, Hu Bowen, Jin Changhao. A study on sedimentary environment evolution model of superimposed foreland basin in western Hunan Province[J]. China Petroleum Exploration, 2016, 21(6): 81-90.

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