摘要：

在野外露头观察和岩心描述的基础上，结合测井、地震和三维电法资料分析，认为塔里木盆地库车坳陷新近系和第四系共发育冲积扇、冲积平原、扇三角洲和湖泊4种沉积相类型；每一种沉积相可以进一步划分为若干沉积亚相和微相。新近纪吉迪克期，古近纪形成的湖泊开始向南部退缩，扇三角洲分布在山前地区；新近纪康村期基本继承了吉迪克期的沉积格局，扇三角洲的分布范围较吉迪克期大；新近纪库车期，构造抬升导致湖泊快速萎缩，山体隆升并遭受剥蚀，为冲积扇的形成提供物源，从山前到盆地中心依次为冲积扇、冲积平原和湖泊；第四纪，湖泊完全消失，以冲积扇沉积为主，冲积平原仅分布在西盐水沟—东盐水沟一线南部地区。

关键词: 塔里木盆地, 库车坳陷, 新近系, 第四系, 沉积相, 沉积演化

Abstract:

On the basis of outcrop observation and core description，as well as data of well logging，seismic and 3-D electrical method，it is believed that four types of sedimentary facies, including the alluvial fan facies, the alluvial plain facies, the fan delta facies and the lake facies, were developed in the Neogene and Quaternary in Kuqa Depression of Tarim Basin. Each facies could be divided into several subfacies and microfacies. During the Neogene Jidike Age, lakes formed in the Paleogene began to shrink southwards, and the fan deltas were developed in submountain region. Sedimentary pattern in the Neogene Kangcun Age was similar to the Jidike Age, but the scale of the fan delta was larger. During the Neogene Kuqa Age, uplift caused the lakes to shrink quickly towards the south, and mountain blocks to rise and be suffered from erosion，which provided sediment source for alluvial fans. The lakes disappeared completely in the Quaternary and alluvial fan became the main sedimentary facies.Fluvial plain was only distributed in the southern Xiyanshuigou-Dongyanshuigou area.

Key words: Tarim Basin, Kuqa Depression, Neogene, Quaternary, sedimentary facies, sedimentary evolution

中图分类号: 

• P531