中扬子西部下志留统生物礁特征及其油气地质意义  

The Organic Reefs Character of Lower Silurian in West Area of Middle Yangtze Region and Its Oil Exploration Significance

作　　者：刘安 王传尚 陈孝红 李旭兵 张保民 曾雄伟 

机构地区：[1]武汉地质矿产研究所,武汉430205

出　　处：《华南地质与矿产》2010年第4期66-71,共6页Geology and Mineral Resources of South China

基　　金：中国地质调查局计划项目(编号:1212010782005)资助

摘　　要：中扬子西部下志留统灰岩、生物礁的分布与奥陶纪-志留纪之交"崇余运动"形成的NE向分布的古隆起相关,沿着鄂西利川-重庆石柱-南川一线,在早志留世小河坝期发育大型水下古隆起,小河坝中期(相当turriculatus带底部)发生区域性海侵,有利于钙质沉积,在鄂西宣恩高罗等古隆起的边缘发育生物礁。高罗生物礁是在陆棚相泥质条带灰岩礁基之上发育的一套以珊瑚和层孔虫为造架生物的生物礁,主要出露礁核的背风面沉积,造架生物间充填含大量藻类的泥岩,指示较深水、宁静的沉积环境。中扬子地区下志留统生物礁是除小河坝砂岩体之外重要的储层类型。The distribution of limestone and organic reefs of ＂Xiaoheba stage＂ of Lower Silurian in the west part of central Yangtze region is related to the NE direction paleo uplifts along Lichuan city of western Hubei province through Shizhu to Nanchuan county of Chongqing city,which was caused by the ＂Chongyu Movement＂.The regional transgression occurred at the base of turriculatus zone was preferable for the organic reefs developed along the margin of paleo uplifts,i.e.Xuan＇en Gaoluo of Western Hubei.The Gaoluo organic reefs mainly consist of coral and stromatoporids,with mud band limestone as reef batholith.The abundant algae filled in the reef-building organisms indicated deep and quiet water environment.Organic reefs is the most important reservoir type except Xiaoheba sandstone body at Lower Silurian in central Yangtze region.

关 键 词：志留系 生物礁 海侵 古隆起 中扬子西部地区 

分 类 号：P534.43[天文地球—古生物学与地层学]