库车坳陷晚白垩世地层存在的证据和沉积相分析

库车坳陷是我国重要的能源基地之一，白垩系是其主要储层。长期以来，该坳陷白垩系的地层划分存在较大争议，其中是否存在上白垩统是争议问题焦点之一。笔者等根据发现的晚白垩世钙质超微化石，证实了库车坳陷巴什基奇克组上部地层属于晚白垩世并存在海相沉积；根据前人在库车坳陷及塔东北井下发现的晚白垩世介形虫、轮藻等化石，证实了这些地区也同样存在上白垩统，古城组是其晚白垩世陆相沉积的代表。若干露头剖面和井下岩芯晚白垩世钙质超微化石的发现，表明特提斯海水曾侵进到该盆地。该坳陷及塔东北地区晚白垩世存在海相和陆相两类沉积体系。

Palaeontological Evidence for Occurrence of the Upper Cretaceous in Kuqa Basin and Its Sedimentary Facies Analysis

The lack of Late Cretaceous stratum,as a long-standing problem,has been regarded in Kuqa Basin,due to a tectonic uplift.By studying the Late Cretaceous nannofossils founded recently in the upper member of the Bashijiqiuke Formation,marine upper Cretaceous and sedimentary environment in this basin are defined.On the basis of the Late Cretaceous ostracoda,charophytes founded in samples from drillholes,continental upper Cretaceous and sedimentary environment in this basin are fixed.Both analyses on sedimentary facies of the Bashijiqike Formation represented marine deposition and the Gucheng Formation represented continental deposition is made in this paper.