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| | | | | 1971-1980
July 4, 1975 Well Ren 4 produced a commercial oil flow from carbonate buried hills in the Bohai Bay area, marking the discovery of the Huabei Oilfield.
June 27, 1971 A commercial oil flow was obtained from well Ling 9 at Maling, Changqing, in the Longdong area of Gansu Province, marking the discovery of the Changqing Oilfield.
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