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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。
Comprehensive outcrop profile, drilling profile, core observation and well logging and seismic data and other qualitative and quantitative data, the use of single factor analysis of multi-factor comprehensive mapping method, the third-order sequence for the mapping unit, the preparation of the recent Qaidam Basin Department of various types of single-factor maps and sedimentary facies. The results show that the deposition of the Neogene in the Qaidam basin has been undergoing the process of continuous expansion of the lake area, and the depositional centers generally have a pattern of migration from south to north and from west to east. The spatial distribution of sedimentary facies shows obvious zonation: the foreland steep slope belt in the western part of Altun Mountains mainly develops the fan delta-lacustrine sedimentary system, and the piedmont gentle slope belt in the middle part of Altun Mountains mainly develops alluvial fan-braided river-plait The delta-lacustrine sedimentary system, the northern margin of Qaidam Basin and the main developed braided river-flood plain sedimentary system in Chaidong area.