Sedimentary evolution of the Jurassic basin groups in Central Tianshan, Xinjiang
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摘要: 侏罗纪时中天山地区沉积盆地由伊-昭盆地、尤尔都斯盆地及焉-库盆地构成,其内沉积了一套厚度巨大的冲积和湖泊成因的碎屑岩沉积体,可识别出6种相类型、18种亚相及44种微相。早侏罗世至中侏罗世西山窑期,气候潮湿、植物繁盛、沼泽密布,形成多层煤层;中侏罗世头屯河期开始,气候变为干燥。下侏罗统三工河组及西山窑组中,辫状河和辫状河三角洲沉积发育,其砂体为好的储集体。下侏罗统八道湾组深湖-半深湖相黑色页岩及煤层是好的生油岩。Abstract: The sedimentary basins in Central Tianshan, Xinjiang were composed, during the Jurassic, of the Yining-Zhaosu, You'erdusi and Yanqi-Kumux Basins, where the huge alluvial-lacustrine clastic deposits were laid down. The clastic deposits may be grouped into six sedimentary facies, eighteen subfacies and forty-four microfacies. During the Early Jurassic to the Xishanyaoan of the Middle-Early Jurassic, the humid climates, flourished plants and abundant swamps and marshes in the study areas facilitated the formation of abundant coal seams. From the Toutunhean of the Middle Jurassic onwards, the climates became progressively arid. The Lower Jurassic Sangonghe and Xishanyao Formations were once dominated by the braided river deposits and braided delta deposits. The black shales and coal seams of the Badaowan Formation in the abyssal-bathyal lake facies are believed to be highly prospective.
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Keywords:
- basin /
- sedimentary facies /
- sedimentary evolution /
- Central Tianshan /
- Xinjiang
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