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- Two periods of high-pressure metamorphic belts, which have been dated 335.5 Ma and 440-460 Ma seperately by isotopic methods, have been discovered in the mid Cambrian and low-middle Ordovician strata. 同位素年龄分别为335.;5 Ma和440-460 Ma的两期高压变质带赋存于中寒武统和下中奥陶统中。
- Ordovician strata in Tahe oilfield belong to carbonate reservoir with well developed fractures and dissolution pores. 塔河油田奥陶系碳酸盐岩储集层裂缝普遍较发育，同时存在大量溶蚀孔隙。
- The correlation of oil-source rock indicated that there are three sets of source rock, namely Cambrian Ordovician, Carboniferous-Permian and Jurassic system. 油-源对比表明有三套烃源岩，即寒武-奥陶系、石炭-二叠系和侏罗系生油岩。
- In this paper, the straticulate dolostone and spatulate dolostone in Lower Ordovician strata of Well Tazhong 1 were studied using petrologic and geochemical methods. 本文选择塔中地区塔中1井下奥陶统藻纹层白云岩与夹层竹叶状白云岩作为对象,应用岩石学与地球化学方法对其成因问题进行了研究。
- Hydrocarbon source rocks in North Tarim Basin can be divided into three petroleum systems such as Cambrian Ordovician system,Tertiary Jurassic system and Carboniferous Permian system. 依据塔北地区烃源岩及勘探状况 ,可划分出寒武 +奥陶系、三叠 +侏罗系及石炭 +二叠系 3套源岩含油气系统 ,其中 ,前两套为已知含油气系统 ,后者为推测含油气系统。
- Tazhong 45 reservoir, lying in the Middle-Upper Ordovician strata of Tazhong area, is a fluoritized carbonate reservoir.There exist many fluorite veins filled with crude oils in its reservoir bed. 摘要塔中45井油藏是位于塔中地区中上奥陶统碳酸盐岩地层中的一个油藏，其储层中发现有大量的被原油充填的萤石脉。
- According to evolutionary periods of paleokarst, three maps are drawn: Ordovician stratum thickness map, Pre-carboniferous karst landform and Ordovician top structure maps of Ordos Basin. 根据古岩溶的演化期次，分别编制了奥陶系地层厚度图、前石炭纪岩溶古地貌图及奥陶系顶面构造图。
- The marine strata, such as the Sinian, Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian and Lower and Middle Triassic, are widespread in South China. 摘要华南地区海相地层分布甚广，震旦系、寒武系、奥陶系、志留系、泥盆系、石炭系、二叠系以及下和中三叠统几乎全为海相地层。
- Keywords Tarim basin Well Kunan 1 Cambrian Ordovician Trilobita Brachiopoda Conodont; 塔里木盆地;寒武纪;奥陶纪;三叶虫;腕足动物;牙形石;
- By study on conodonts, fossil petrology, rock assemblage and logging data, this set of strata is reclassified and described, and the stratum sequence of Cambrian and Ordovician is established. 通过牙形石、化石岩石学和岩性组合的研究;结合测井资料对这套地层进行了重新厘定;建立了古生代寒武纪、奥陶纪地层层序;并对这套地层特征进行了详细描述.
- CORRELATION AND ANALYSIS OF THE ORDOVICIAN STRATA AT THE SOUTH MARGIN OF THE ORDOS BASIN 鄂尔多斯南缘奥陶纪地层对比分析
- Major hydrocarbon source rocks are in the Cambrian and Ordovician. 寒武-奥陶系烃源岩是该区主力烃源岩;
- Study on Outcrop Sequence Stratigraphy of the Lower-Middle Ordovician Strata in Keping Tarim Basin 塔里木盆地柯坪地区中下奥陶统碳酸盐岩露头层序地层学研究
- And Ordovician and Cambrian, Quaternary of the people who hailed from a fight. 和奥陶纪、寒武纪、第四纪的生灵们打个招呼。
- We can follow the history of life through the strata. 我们可以通过这一层层的地层跟踪生命的历史。
- They represent each society stratum. 他们代表各个社会阶层。
- The older strata gradually disintegrate. 较老的岩层渐渐风化。
- Ordovician strata 奥陶系
- The older strata gradually disintegrated. 年代较久的地层逐渐崩解了。
- 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。
