海拉尔盆地旧桥凹陷下白垩统伊敏组、大磨拐河组上段沉积相分析

Analysis on sedimentary facies of upper member in Yimin Formation and Damoguaihe Formation of Lower Cretaceous in Jiuqiao Sag of Haila'er Basin

从沉积学、地球物理和古生物等方面对旧桥凹陷沉积盖层下白垩统伊敏组、大磨拐河组上段划分标志进行了论述,利用钻孔资料对两个组沉积相进行了划分,并对其沉积特征进行了分析,指出伊敏组是本区地浸砂岩型铀矿找矿的有利层位。

Classification indication on upper member of Yimin Formation and Damoguaihe Formation of Lower Cretacious in the sedimentary cover in Jiuqiao Sag are discussed from the aspect of sedimentation, geophysics and palaeo-biology. The sedimentary facies of the two formations are classified by using the drilling information. Sedimentary characteristics are analyzed. It is pointed out that Yimin Formation is the favorable layer for the exploration of the leachable sandstone-type uranium deposits in this area.