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点坝(Point bar)是曲流河段十分明显而又重要的沉积体,它是河流侧向迁移过程中侧向加积和垂向加积共同作用的产物。古代点坝沉积是地下水和油气储集的良好场所,因此,对点坝的研究引起沉积学家、石油地质学家的浓厚兴趣,麦高恩(McGowen)和加纳(Garner)(1970)研究了路易斯安娜州阿米特河和德克萨斯州科罗拉多河曲流点坝中的沉积构造,科尔曼(Coleman)(1969)和雷(Ray)(1967从不同角度分别对孟加拉的布拉马普特拉河和密西西比河的点坝沉积进行了研究,特别是艾伦(Allen)(1964)提出的点坝垂向沉积层序模式得到广泛的重视。1982年北京石油勘探开发科学研究院和河北地理所在定兴点坝上挖探槽11条,一般在深2米左右,详细
The point bar is a very obvious and important sedimentary body in the meandering river, which is the product of lateral and vertical accretion during the lateral migration of the river. The ancient point dam deposition is a good place for groundwater and oil and gas accumulation. Therefore, the study of point dams has attracted a great deal of interest from sedimentologists and petroleum geologists. McGowen and Garner (1970) Sedimentary structures in the Amit in Louisiana and the meandering dams in the Colorado River in Texas, Coleman (1969) and Ray (1967), from different perspectives to Bratislava, The Daba and Mississippi point-dam deposits were studied, especially the point-dam vertical depositional sequence model proposed by Allen (1964), which received extensive attention. In 1982, Beijing Petroleum Exploration and Development Research Institute and Hebei Geography Dingxing point dug excavation groove 11, generally about 2 meters deep, detailed