lower ordovician meaning in English
下奥陶纪
早奥陶世
Examples
- The lower palaeozoic group mainly includes cambrian , medial and lower ordovician , which are marine carbonate in the district
下古生界包括寒武系和下、中奥陶统，主要由海相碳酸盐岩构成。 - The causes are discussed from aspects of oil - gas source beds , trapping and storing space , oil - gas migration channel and thick proofing layers , oil - gas maturity stage and allocation of effective trapping stage , suggesting the searching of primary oil - gas pool of the cambrian and lower ordovician at the relatively shallow layers and surrounding places with faults developed
从油气源层、圈闭与储集空间、油气运移通道与巨厚隔层、油气成熟期与圈闭有效期配置等四个方面探讨了未获油气之原因，提示在满加尔坳陷腹地，相对较浅部位及周边断裂发育部位寻找寒武系和下奥陶统的原生油气藏。