库车前陆盆地第三系沉积相配置及演化研究

以塔里木盆地库车前陆坳陷第三系的重点油气储层段—下第三系库姆格列木群和苏维依组,以及上第三系吉迪克组为主要研究对象,识别出区内主要发育了扇三角洲、三角洲、湖泊和潮坪—泻湖相等沉积相类型。结合对前陆构造运动和沉积古地理的综合分析,指出了库车坳陷第三系的沉积演化特点:北部山前带以发育扇三角洲相为典型特征,南部出现正常三角洲相,中部以湖泊相占优势,且沉积和沉降中心从库姆格列木群沉积时期至吉迪克组沉积时期有由西向东迁移的特点。 

Arrangement and Evolution of Tertiary Sedimentary Facies in Kuche Foreland Basin, XinJiang

The Paleogene Kumugeliemu Group and Suweiyi Formation, and the Neogene Jidike Formation are key reservoirs in the Kuche foreland basin. In this paper, based on sophisticated analyses on sedimentary features of these reservoirs, we proposed four main facies types, i.e., fan delta, delta, lake, tidal flat and lagoon. Combined with characteristics of foreland structural movements and paleo-geography, the evolution of sedimentary facies was reconstructed. In the northern foreland belt in front of the South Tianshan, fan delta typified the developed sedimentary facies. In contrast, the southern part is characterized by natural delta deposit, and the central area mainly belongs to lake facies. In addition, the centre of depression and sedimentation tended to migrate from the west to east, from Kumugeliemu to Jidike age.