扬子地区晚奥陶世碳酸盐台地淹没事件及其地质意义  

The Late Ordovician drowning of the Yangtze carbonate platform and its geologic significance

作　　者：严德天[1,2] 王清晨[2] 陈代钊[2] 汪建国[2] 邱振[2] 

机构地区：[1]中国地质大学(武汉)构造与油气资源教育部重点实验室武汉430074 [2]中国科学院地质与地球物理研究所北京100029

出　　处：《地质科学》2011年第1期42-51,共10页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家重点基础研究发展计划“973”项目(编号:2005CB422101);国家自然科学基金项目(编号:40839907,40903032);中央高校基本科研业务费专项资金(编号:CUGL100403)资助

摘　　要：碳酸盐岩台地广泛发育及其淹没事件是扬子地区晚奥陶世地层的重要特征之一。基于岩石学、沉积学特征和古生物资料等对扬子地区晚奥陶世碳酸盐岩台地沉积演化、淹没事件及其油气地质意义进行了分析。结果表明:扬子地区晚奥陶世沉积演化分为宝塔—临湘期碳酸盐台地沉积和五峰期深水、浅水陆棚沉积两个阶段;淹没事件开始于五峰初期,主要受控于构造挠曲引发的海平面相对上升;淹没事件影响着扬子地区晚奥陶世油气生、储、盖层的形成和分布,对其加深认识具有重要的理论和油气勘探意义。The drowning of the carbonate platform is one of the most spectacular geological processes in the Late Ordovician on Yangtze block. Based on sedimentological and palaeontologic data, the drowning process of Late Ordovician carbonate platforms and geologic consequence in Yangtze area, as well as its significance for oil exploration, were documented. These data indicate the following facts： （ 1 ） during the Baota and Linxiang periods of Late Ordovician, epicontinental carbonate platform occupied most of the Yangtze block ; （2） Drowning occurred in the early stage of Wufeng period, due to a rapid rise in sea level resulted from tectonic flexure; （3）during the drawing stage, widespread black shales of Wufeng Formation were deposited on the Yangtze block,which are served as favourable source rocks for hydrocarbons in the region.

关 键 词：碳酸盐岩台地 淹没事件 晚奥陶世 扬子地区 

分 类 号：P534.42[天文地球—古生物学与地层学]