The asphaltene RICO indicates that the Middle and Upper Ordovician may be the main source rocks of the oils in Lunnan, Tahe and Hadexun Oilfields.
沥青质的RICO研究结果表明，中、上奥陶统烃源岩为轮南、塔河、哈得逊原油的主力烃源岩。
The two karst developing periods for the Middle and Upper Ordovician in the Lunnan area are consistent with two transgressions of the Carboniferous.
轮南地区发育的两期岩溶与石炭纪两次较大的海侵时间相一致。
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。
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