地质科技通报2025，Vol.44Issue(2)：161-181,21.DOI:10.19509/j.cnki.dzkq.tb20240483
二叠纪中晚期地质事件对川东北富有机质页岩发育的控制
Controls of Middle and Late Permian major geological events on the development of the organic-rich shales in northeast Sichuan Basin
摘要
Abstract
[Objective]Three sets of black organic-rich shales found in the Permian Dalong Formation,Wujiaping Formation,and Maokou Formation in northeastern Sichuan have yielded significant discoveries in shale gas exploration,presenting new opportunities beyond the established Wufeng-Longmaxi marine shale gas plays.[Methods]This study investigated the lithological characteristics and paleoenvironmental evolution of these formations through petrological and geochemical analyses.A comprehensive examination of the depositional environments and the key controlling factors for organic matter enrichment during the deposition of these organic-rich black shales from the Middle to Late Permian in northeastern Sichuan has been performed.[Results]The findings demonstrate that the three organic-rich shales exhibit considerable heterogeneity,with distinct controlling factors influencing their development.The sedimentary period of the third member of the Maomao Formation was characterized by strong upwelling,weak volcanic activity,and limited hydrothermal activities.This environment featured a warm and humid climate,extremely high primary productivity,low terrestrial input,and anoxic sulfide water conditions.In contrast,the sedimentary environment of the second member of the Wujiaping Formation was marked by high productivity,low continental source input,seasonal upwelling,weak hydrothermal activity,and interstitial sulfidation-sulfidation conditions and driven by strong hydrothermal fluid,upwelling,and island arc volcanic activity.The sedimentary environment of the Dalong Formation also exhibited high primary productivity,low terrestrial input,and interstitial sulfidation-sulfidation conditions.[Conclusion]The research highlights the complex interactions of multiple geological events on organic-rich shales and constructs a genetic model for these shales influenced by various geological factors.This model provides a theoretical basis and supports the identification of favorable areas for marine shale gas exploration.关键词
地质事件/成因模式/上扬子地区/大隆组/吴家坪组/茅口组/富有机质页岩/二叠纪Key words
geological event/genetic model/Upper Yangtze area/Dalong Formation/Wujiaping Formation/Maokou Formation/organic-rich shale/Permian分类
地质学引用本文复制引用
邓空,苟启洋,王瀚明,陆扬博,张柏林,刘占红,蒙冕模,杜学斌,陈斐然,李飞,陆永潮..二叠纪中晚期地质事件对川东北富有机质页岩发育的控制[J].地质科技通报,2025,44(2):161-181,21.基金项目
国家自然科学基金项目(42072137 （）
42472201 （）
42472197) （）
"地大学者"人才岗位科研启动经费(2023099) （2023099）
国家重大科技专项"大型油气田及煤层气开发"(2022ZC06070001) （2022ZC06070001）
