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Sedimentary characteristics of the 1st member of the Middle Jurassic Yan'an Formation in western Mahuangshan,Ordos Basin
QI Binwen

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The 1st member of the Middle Jurassic Yan'an Formation in western Mahuangshan, Ordos Basin consists of fluvial sedimentary deposits, including braided and meandering stream deposits. Two main subfacies were identified: riverbed and overbank, with various microfacies like channel bars and point bars. The sedimentary system was dominated by braided stream deposits during the Yan-10 oil measures, with NW to SE oriented palaeocurrents. Meandering stream deposits prevailed during the Yan-9 oil measures due to lake-level rising.