根据岩心观察结果,结合钻井、地震及测井资料,对车排子地区新近系沙湾组沉积特征进行研究.结果表明:沙湾组发育辫状河三角洲一湖泊沉积体系,沉积物源来自北西方向的扎伊尔山;排2井区沙湾组二段下部砂体为水下分流河道沉积,而不是前人认为的滩坝沉积;沙湾组的平面沉积相呈北西一南东向展布,沉积演化从早到晚经历了辫状河三角洲前缘亚相、滨浅湖亚相和辫状河三角洲平原亚相的沉积时期;研究区水下分流河道和砂坝为有利储集相带.%According to core observation results, combining with drilling, seismic and logging data, the depositional characteristics of Shawan formation in Neogene of Chepaizi area were researched. The results show that the depositional system of Shawan formation is braided river delta-lacustrine facies and the sedimentary deposit comes from Zaire Hill at north west. The microfacies of well Pai 2 is underwater distributary channel deposit but not beach or bar. The sedimentary facies is typical of north west-south east distribution. Vertically, the sedimentary facies have undergone changes from braided river delta front subfacies to longshore shallow lacustrine subfacies to braided river delta plain subfacies. Underwater distributary channel deposit and sandbar are the favorable reservoir facies belt in the study area.
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