鄂尔多斯盆地西缘忠平1井奥陶系乌拉力克组笔石生物地层划分  

The Graptolite Biostratigraphy of the Ordovician Wulalike Formation from the Well Zhongping-1 in the Western Margin of the Ordos Basin

作　　者：王传尚 胡勇 危凯 WANG Chuan-Shang;HU Yong;WEI Kai(Hubei Key Laboratory of Paleontology and Geological Environment Evolution,Wuhan Center,China Geological Survey(Geosciences Innovation Center of Central South China),Wuhan 430205,Hubei,China;College of Resources and Environment,Yangtze University,Wuhan 430100,Hubei,China)

机构地区：[1]古生物与地质环境演化湖北省重点实验室,中国地质调查局武汉地质调查中心(中南地质科技创新中心),湖北武汉430205 [2]长江大学资源与环境学院,湖北武汉430100

出　　处：《华南地质》2024年第3期519-527,共9页South China Geology

基　　金：国家自然科学基金项目(42172038)。

摘　　要：鄂尔多斯盆地西缘奥陶系乌拉力克组页岩气勘探在忠平1井首获突破,该井黑色页岩的划分与对比是下一步页岩气选区评价的关键科学问题之一。本文通过对岩心笔石化石的研究,在该井乌拉力克组自上而下建立了Nemagraptus gracilis带和Jiangxigraptus vagus带,并与露头区奥陶系同期地层进行对比,揭示了盆地西缘奥陶系乌拉力克组黑色页岩具有穿时分布的规律,进而为页岩气选区评价提供了精准的时间标尺。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.

关 键 词：鄂尔多斯盆地西缘 乌拉力克组 忠平1井 笔石分带 黑色页岩 穿时 

分 类 号：P534.42[天文地球—古生物学与地层学]