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奥陶系乌拉力克组黑色笔石页岩是华北板块海相页岩气勘探的一套主力层系。针对乌拉力克组开展岩石学、古生物学与地球化学等综合研究,有利于提高对该烃源岩时空分布规律的认识,并服务于油气资源勘探。本文在华北鄂尔多斯盆地西缘页岩气勘探重点区域,对内蒙古鄂托克旗QT-11井和宁夏盐池HT-5井乌拉力克组,开展古生物学和生物地层学研究,鉴定出笔石19属37种(含4个未定种)并自下而上识别出3个笔石带(Didymograptus murchisoni带(?)、Nemagraptus gracilis带和Climacograptus bicornis带),鉴定出牙形刺化石5属5种,放射虫化石5属7种(含1个未定种),进一步提高了乌拉力克组及其上下地层划分与对比的精度。化学地层学结果显示有机碳同位素在2口钻井中可进行良好对比,达瑞威尔中期碳同位素正漂移(MDICE)下降段的显著变化特征可作为乌拉力克组底部重要的化学地层识别标志。同时,本文对乌拉力克组岩性特征进行了厘定,以灰岩层消失和大套黑色笔石页岩出现作为该组底界的识别标志。基于综合地层学研究建立的高分辨率综合地层格架,可广泛应用于露头、科研钻井与勘探生产钻井的岩石地层划分与对比中,从而为鄂尔多斯盆地西缘乌拉力克组页岩气勘探提供了重要地层学依据。
Abstract：The Ordovician Wulalike Formation black shale is a major shale gas target in the North China Block. A comprehensive stratigraphic investigation of the Wulalike Formation black shale, integrating petrology, paleontology,and geochemistry, is crucial for understanding the spatio-temporal distribution of this hydrocarbon source rock and for guiding oil and gas exploration. This study presents systematic paleontological and biostratigraphic analysis of the QT-11(Inner Mongolia) and HT-5(Ningxia) wells in the western Ordos Basin. The research identified 37 graptolite species(including 4 undetermined) belonging to 19 genera, and established three graptolite biozones(in ascending order): the Didymograptus murchisoni(?), Nemagraptus gracilis, and Climacograptus bicornis biozones. Additionally,it recorded 5 species(5 genera) of conodonts, and 7 species(5 genera, including 1 undetermined) of radiolarians. These results refined the stratigraphic division and correlation of the Wulalike Formation and adjacent strata.Chemostratigraphic results show a strong correlation in organic carbon isotopes between the two wells. The characteristic declining limb of Middle Darriwilian Isotope Carbon Excursion(MDICE) serves as an important marker for the base of the Wulalike Formation. Lithostratigraphically, the base of the Wulalike Formation is redefined here at the onset of abundant black shale and the disappearance of limestone. The high-resolution integrative stratigraphic framework established in this study provides a reliable tool for subdividing and correlating outcrops and drill cores,offering critical support for shale gas exploration in the western Ordos Basin.
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基本信息:
DOI：10.19839/j.cnki.dcxzz.2026.0001
中图分类号:P618.13
引用信息:
[1]黄正良,武学进,刘洋,等.华北板块西缘奥陶系乌拉力克组黑色页岩综合地层学研究[J].地层学杂志().DOI:10.19839/j.cnki.dcxzz.2026.0001.
基金信息:
中国科学院战略性先导科技专项B类(XDB0850000); 国家重大科技专项(2025ZD1400203); 中国石油长庆油田重大科技专项(2024D1JC06)
2026-02-05
2026-02-05
2026-02-05