The Graptolite Biostratigraphy of the Ordovician Wulalike Formation from the Well Zhongping-1 in the Western Margin of the Ordos Basin
The Well Zhongping-1 is the first borehole to achieve a breakthrough for the shale gas exploration on the Ordovician Wulalike Formation in the western margin of the Ordos Basin.The classification and correlation of the black shale for this borehole would be one of the key scientific problems in the successive evaluation of favorable shale gas exploration zones.The Nemagraptus gracilis biozone and Jiangxigraptus vagus biozone have been established in descending order in this borehole by the study on the graptolite fauna from the drill core.Compared with the coeval strata at the outcrop regions,the diachronous distribution pattern of the black shale in the Wulalike Formation has been revealed in the western margin of the Ordos Basin,which provides the accurate time scale for evaluation and optimization of the favorable shale gas exploration zones.
the western margin of the Ordos BasinWulalike FormationWell Zhongping-1graptolite zonationblack shalediachroneity
万方数据
维普
