冲积扇的类型受气候、构造和沉积等多方面因素控制，不同类型冲积扇的沉积特征对于储层的有效开发影响程度不同。多数人认为，冲积扇可以划分为湿润扇和干旱扇两大类，准噶尔盆地西北缘克下组冲积扇属于干旱扇。但是，岩石学、沉积组分、沉积构造、结构成熟度、沉积旋回特征的分析表明：准噶尔盆地西北缘克下组冲积扇属于湿润型向干旱型过渡的中间类型。%The types of alluvial fans are determined by many factors such as climate, structures, deposition and so forth,the characteristics of these fans exert influence on effective development of reservoirs. A lot of scholars argue that alluvial fans can be divided into wet and arid ones, so that the fan of Lower Karamay Formation in the northwestern margin of Zhunger Basin belongs to the latter. However, the analysis on petrology, deposited components, sedimentation structures, structural maturity, characteristics of the sedimentary cycles and the fan scales show that the type of the alluvial fans of the above formation belongs to the intermediate type during the transition period between the wet and the arid.
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