准噶尔盆地南缘山前断褶带紫泥泉子组沉积相

Sedimentary Facies of Ziniquanzi Formation of Paleogene in Piedmont Fault-Fold Zone of Southern Margin of Junggar Basin

根据露头与钻、测井资料将准噶尔盆地南缘古近系紫泥泉子组划分为冲积扇、辫状河、辫状河三角洲和湖泊相4种沉积相类型,并详细探讨了各亚相、微相的沉积特征。依据紫泥泉子组存在两个区域稳定发育的大套泥岩,以及区域不整合、河道下切面或沉积体系转换面等,将准噶尔盆地南缘山前断褶带紫泥泉子组划分为上、下两段。探讨了紫泥泉子组沉积体系展布及沉积演化。紫泥泉子组沉积早期沉积格局为冲积扇、辫状河-辫状河三角洲-湖泊共存;晚期为以湖泊沉积为主的辫状河-辫状河三角洲-浅湖沉积组合。

Based on the comparative study between outcrop and well logging data, the sedimentary facies of Ziniquanzi formation are divided into alluvial fan, braided river, braided river delta and lake ones. According to the two suits of mud which developed stably in Ziniquanzi formation, unconformity, erosion surface or sedimentary system interface in study area, the Ziniquanzi formation in fault-fold zone in southern margin of Jungar basin is classified into two segments, the upper segment and the lower segment. The diagram of the sedimentary system distribution is worked out by the two segments. The results show that the early Ziniquanzi formation （the lower segment） is in the sedimentary framework of fluvial fan-braded river-braded delta-lake facies; the late Ziniquanzi formation （the upper segment） is in the sedimentary assemblage of braded river-braded delta-lake facies, dominated by lake deposit.