古地理学报2025，Vol.27Issue(3)：596-610,15.DOI:10.7605/gdlxb.2025.030
鄂西地区下寒武统牛蹄塘组页岩层序地层格架及沉积演化
Stratigraphic framework and sedimentary evolution of the Lower Cambrian Niutitang Formation shale in western Hubei Province
摘要
Abstract
The shale of the Lower Cambrian Niutitang Formation is an important hydrocarbon source rock in the Middle and Upper Yangtze region.However,significant inconsistencies remain regarding the stratigraphic division and framework establishment of the Niutitang Formation in the Middle and Upper Yangtze region.Moreover,sequence stratigraphic studies focused specifically on the Niutitang shale are still limited.In this study,the stratigraphic framework and sedimentary evolution of the Lower Cambrian Niutitang shale in western Hubei Province were systematically analyzed using an integrated approach incor-porating field outcrop observations,drilling core data,conventional and spectral logs,and geochemical proxies.Two third-order sequences are recognized within the Niutitang Formation shale in western Hubei Province.The first(Niu 1 Member)and second(Niu 2 Member)members each constitute a third-or-der sequence composed of a Transgressive Systems Tract(TST)and a Highstand Systems Tract(HST).Sequence stratigraphic correlation enabled the reconstruction of depositional environments and relative sea-level fluctuations,revealing four evolutionary phases during the Early Cambrian:a fluctuating transgress-ive stage,a fluctuating regressive stage,a rapid transgression,and a gradual regression.A comprehen-sive depositional model for the Niutitang shale is established,providing a theoretical foundation for predicting favorable reservoir intervals and guiding future shale gas exploration in the Central and Upper Yangtze region.关键词
页岩/层序地层/沉积演化/牛蹄塘组/鄂西地区Key words
shale/sequence stratigraphy/sedimentary evolution/Niutitang Formation/western Hubei Province分类
地质学引用本文复制引用
段轲,文剑航,张焱林,刘早学,宋腾,李浩涵..鄂西地区下寒武统牛蹄塘组页岩层序地层格架及沉积演化[J].古地理学报,2025,27(3):596-610,15.基金项目
古生物与地质环境演化湖北省重点实验室开放研究基金课题(编号:PEL-202005)资助.Financially supported by the Open Research Fund of the Key Laboratory of Paleontology and Geoenvironmental Evolution of Hubei Province(No.PEL-202005) （编号:PEL-202005）
