... 早奥陶世 lower ordovician 中奥陶世 middle ordovician; middle-ordovician 旱奥陶世晚期 arenigian stage ...
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Middle Ordovician 中奥陶世 ; 中奥陶统 ; 奥陶系中统
early middle ordovician 早中奥陶世
Lower-Middle Ordovician 中下奥陶统
end of middle ordovician period 中奥陶世末
Cambrian-Middle Ordovician 寒武纪
The reservoirs in Baota Formation of Middle Ordovician in South Sichuan are characterized by low porosity and low permeability and belong to a fractured type.
川南地区中奥陶统宝塔组储层具低孔低渗特征，属裂缝性储集类型。
In early Ordovician North Qilian region again stretched and suffered second oceanization, up to middle Ordovician a mature ocean basin with a trough-arc-basin system already formed.
早奥陶世北祁连地区再次拉张，遭受第二次大洋化，到中奥陶世形成具沟弧盆体系的成熟大洋。
The main water source is fracture-karst water in Middle Ordovician carbonate rocks.
主要的供水水源为中奥陶统碳酸盐类岩石中的裂隙-喀斯特水。
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