柴达木盆地新近系沉积特征及演化  

Sedimentary characteristics and evolution of Neogene in Qaidam Basin

作　　者：苏妮娜 金振奎[2] 宋璠 顾军锋[2] 陈英 张卫丹[2] 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]中国石油大学(北京)油气储层重点研究室,北京102249

出　　处：《中南大学学报（自然科学版）》2015年第11期4155-4164,共10页Journal of Central South University:Science and Technology

基　　金：山东省自然科学基金资助项目(ZR2011DL005);国家科技重大专项(2011ZX05009-002);中央高校基本科研业务费专项资金资助项目(11CX04013A)~~

摘　　要：综合野外露头剖面、钻井剖面、岩心观察以及测井、地震等各种定性及定量资料,采用单因素分析多因素综合作图法,以三级层序为作图单位,编制柴达木盆地新近系各类单因素图件和沉积相图。研究结果表明:柴达木盆地新近系沉积经历湖泊面积持续扩大的演化过程,沉积中心总体上有由南向北、由西向东迁移的规律。沉积相的空间展布具有明显的分带性:在阿尔金山西段的山前陡坡带主要发育扇三角洲-湖泊沉积体系,阿尔金山中段的山前缓坡带主要发育冲积扇-辫状河-辫状河三角洲-湖泊沉积体系,柴北缘及柴东地区主要发育辫状河-洪泛平原沉积体系。Based on all kinds observation, well logging and of qualitative and quantitative data of field outcrop section, drilling profiles, core seismic data, according to the single factor analysis and multifactor comprehensive mapping method, the maps of single factors and sedimentary facies of the Neogene in Qaidam Basin were compiled with three-order sequence as the mapping unit. The results show that the lake area of the Neogene continues to expand and the sedimentary center has migrated from south to north and from west to east in Qaidam Basin. Spatial distribution of sedimentary facies has obvious zonality. The sedimentary facies are respectively fan delta-lake sedimentary system in piedmont steep slope zone of the western Altun Mountains, the alluvial fan-braided river-braided river delta-lake sedimentary system in piedmont gentle slope zone of the middle section of the Altun Mountains, and the braided river-floodplain sedimentary system in the eastern and northern margin of Qaidam Basin.

关 键 词：柴达木盆地 新近系 单因素分析多因素综合作图法 定量沉积相 沉积相演化 

分 类 号：P512.2[天文地球—地质学]