【摘要】 塔里木盆地奥陶系出露于盆地周缘并在覆盖区主要构造单元钻遇。覆盖区奥陶系包括台地相、斜坡相和槽盆相三大类型；含有冷水型和暖水型牙形石化石及珊瑚、笔石、三叶虫和几丁虫等化石，共划分出57个带或组合。根据多门类化石将盆地奥陶系诸多岩石地层单元的时代、中-上奥陶统和寒武系界线进行标定；分别对各构造单元内部及全盆地奥陶系各地层单元进行对比；指出盆地内存在相带变化、奥陶系内部地层间断等问题。更多还原

【Abstract】 The ordovician is outcropped in peripheral of Tarim basin and was encountered in drilling of main structure of the cover area. The ordovician in cover area includes platform facies, slope facies and trough basin facies in which there exist fossils such as cold water and warm water condont, anthozoa, graptolite, trilobita and chitinozoa etc., and 57 fossil belts or combinations can be divided. Moreover, the age of stratigraphic unit and the boundary between Middle-Upper Ordovician and Cambrian was demarcated, and the stratigraphic unit of Ordovician in each structure and basin were correlated. It is pointed out that there exist the facies changes, rock unit diachroneity and discontinuity of interior formations in Ordovician.更多还原