【摘要】 对吐哈盆地以粗碎屑岩含煤为特征的八道湾组进行了沉积环境和聚煤作用分析,编制了各种单因素图件及古地理图。识别出盆地内来自北侧和南侧物源区的多个三角洲朵体,其中在台北凹陷西部发育的吐鲁番—七泉湖三角洲是一个典型的来自南部物源区的大型三角洲,它控制了台北凹陷西部的相带及煤层展布。盆地内煤层主要形成于三角洲间湾和下三角洲平原以及冲积平原岸后的沼泽环境,这里一般有中等的沉降幅度并且陆源碎屑供给受到限制。更多还原

【Abstract】 This paper mainly discusses the palaeo environments and coal accumulation of the Badaowan Formation in the Turpan-Hami Basin.The Badaowan Formation is composed of conglomerates and coarse-grained sandstones,interbedded with fine grained sandstones and siltstones,and intercalated with thick coal seams.The palaeo geography of this Formation has been reconstructed based on a number of single factor maps.Several delta lobes along both the north and south sides have been recognised.The northern lobes include the Aiwergou delta,Kerjan delta,Kekeya delta,and Zhao 1# delta.The southern lobes include the Turpan-Qiquanhu delta,Qiketai delta,and Gadatai delta.The lake is distributed along the north side of the Taibei subdepression.The Turpan-Qiquanhu delta dominating the most area of the western part of Taibei subdepression plays a major control on the facies and coal distribution.The coals is preferentially accumulated in inter-delta bay,lower delta plain and back swamp of fluvial system,where moderate subsidence is kept and there is little input of coarse-grained sediments.更多还原