Distribution of a Large Area of Sand Body Formation Mechanism:Ephemeral Streams in Arid Climate
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摘要: 我国西部新疆地区侏罗系—下白垩统大面积、厚层状砂岩油气勘探获得了重大发现, 大面积厚层状砂体及泥岩红层沉积的成因机理受到长期关注。结合现今准噶尔南缘多条季节性河流的沉积体系、砂体展布特征分析, 并对比郝家沟—头屯河剖面、玛纳斯河剖面上侏罗统齐古组、喀拉扎组的岩相组合、岩石颜色、砂泥岩沉积构造、沉积序列与古环境分析, 认为干旱气候下头屯河组上部—喀拉扎组的季节性曲流河—季节性辫状河沉积是上侏罗统大面积厚层状砂砾岩体及厚层状泥岩红层沉积的重要成因机理, 进而建立了季节性河流的砂体构型和成因模式。准噶尔盆地南缘季节性河流沉积砂体构型和成因模式的建立, 对进一步认识我国古代季节性河流沉积提供了有益参考。Abstract: A major breakthrough of thick bedded sandstone oil and gas exploration is in China's western Xinjiang region of Jurassic and Cretaceous. Large areas of thick layer of sand body and red mudstone layer deposition formation mechanism have been a research focus by attention for a long time. Combined with much more information including southern margin of Junggar Basin sedimentary system of seasonal rivers, sand body distribution characteristics of analysis, and analysis of the lithofacies assemblages and rock color, sedimentary structure and formation mechanism of sandstone and mudstone of the Haojiagou-Toutun River section and Manasi River section of Toutun River formation of Middle Jurassic in upper part of Middle Jurassic Qigu and Kalazha Formation in the southern margin of the Junggar Basin, We think arid climate background ephemeral streams are the main sediment types of the period. An ephemeral streams sand body configuration and the genetic model have been established, and further understanding of ancient ephemeral streams sedimentary will provide the beneficial reference in China.
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