There were various trap types developed in the Middle Upper Ordovician, including sedimentary type, reef type and structure controlled sedimentary type.
中上奥陶统圈闭发育多种类型，有成岩型圈闭、礁型圈闭和受构造作用控制的成岩型圈闭。
Gucheng Ordovician reef beach facies lithostratigraphic trap zone and Luobupo Ordovician reef beach facies structure-lithostratigraphic trap zone.
古城奥陶系礁滩相岩性圈闭带和罗布泊奥陶系礁滩相构造—岩性复合圈闭带。
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