康滇古陆东侧上奥陶统五峰组-下志留统龙马溪组富有机质白云石特征及其地质意义  

Characteristics of Organic-rich Dolomites from Upper Ordovician Wufeng Formation——Lower Silurian Longmaxi Formation in the Eastern Part of Kangdian Ancient Land and Their Geological Significances

作　　者：赵安坤[1,2] 时志强 王学峰[4] 彭军 雷子慧[2,6] 余谦 郝景宇[7] 张娣 ZHAO An-kun;SHI Zhi-qiang;WANG Xue-feng;PENG Jun;LEI Zi-hui;YU Qian;HAO Jing-yu;ZHANG Di(Chengdu Center,China Geological Survey,Chengdu 610081,China;Key Laboratory of Sedimentary Basin of Oil and Gas Resources,Ministry of Natural Resources,Chengdu 610081,China;Chengdu University of Technology,Chengdu 610059,China;No.7 Oil Production Plant,Changqing Oilfield Company,Xi'an 710021,China;School of Geoscience and Techudogy,Southwest Petrdeum University,Chengdu 61050,China;College of Literature and Journalism,Sichuan University,Chengdu 610064,China;Sinopec Exploration Company,Chengdu 610000,China)

机构地区：[1]中国地质调查局成都地质调查中心,成都610081 [2]自然资源部沉积盆地与油气资源重点实验室,成都610081 [3]成都理工大学沉积地质研究院,成都610059 [4]长庆油田分公司第七采油厂,西安710021 [5]西南石油大学地球科学与技术学院,成都610500 [6]四川大学文学与新闻学院,成都610064 [7]中石化勘探分公司,成都610000

出　　处：《矿物岩石地球化学通报》2022年第2期307-316,共10页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家重大科技专项课题(2016ZX05034004-001);油气藏地质及开发工程国家重点实验室基金资助项目(PLC20210104);四川省科技计划项目(2021YJ0353);中国地质调查项目(DD20221661)。

摘　　要：本次对康滇古陆东侧五峰组-龙马溪组页岩中富有机质白云石进行了矿物学、古生物学和地球化学分析测试,以探讨其形成环境和地质意义。结果表明,该富有机质白云石的形成环境为深水陆棚环境,即其水体呈次还原硫化、古生产力高、缺乏陆源碎屑输入环境。通过探讨该富有机质白云石成因及与有机质富集的关系,认为富有机质白云石的存在可能与微生物的繁盛紧密相关,指示这为富有机质页岩形成的有利环境,白云石的分布范围可能为盆山过渡带页岩气勘探有利区域。In this paper,the mineral components,microstructures,and geochemical characteristics of organic-rich dolomite samples from shale layers of the Wufeng and Longmaxi formations in eastern part of the Kangdian ancient land have been studied by conducting analytical methods of geochemistry,paleontology,and mineralogy.It is manifested that the organic-rich dolomite was formed in a deep-water shelf environment in which the water body was characterized with secondary reduction vulcanization,high paleoproductivity,and lack of terrigenous detrital input.By discussing the relationship between the origin and enrichment of organic-rich dolomite in the Wufeng and Longmaxi formations,we have suggested that the existence of organic-rich dolomite could be closely related to the flourishing of microorganisms,indicating the favorable environment for the formation of organic-rich shale whose distribution area may be the favorable area for the shale gas exploration in the basin-mountain transition zone.

关 键 词：康滇古陆 五峰组 龙马溪组 富有机质白云石 成岩环境 

分 类 号：P578.6[天文地球—矿物学]