贺兰拗拉谷北段奥陶系等深流沉积研究  

Ordovician contourites in northern Helan aulacogen,northern China

作　　者：丁海军[1] 

机构地区：[1]中国地质大学,北京100083

出　　处：《沉积与特提斯地质》2008年第4期36-43,共8页Sedimentary Geology and Tethyan Geology

基　　金：科技部国家重点基础研究(001CB711002);国家自然科学基金(40172043;40572073);中国地质调查局项目(200313000055)

摘　　要：笔者采用野外观察和室内分析相结合的研究方法,分析了贺兰拗拉谷北段桌子山剖面奥陶纪地层的沉积相特征及沉积环境的垂向变化和横向迁移规律。以桌子山剖面奥陶系沉积相研究为基础,采用F ischer图解法,求取了其可容空间的变化曲线。在此基础上,结合沉积相模式,识别出了典型的碳酸盐等深流沉积,建立了贺兰拗拉谷北段奥陶系层序地层学模式,为拗拉谷的存在提供了有力的证据。各层序的水进体系域,应列为该区油气勘探的重要目标层段。The approach to the Ordovician contourites is based on the field outcrops and laboratory analysis for the Zhuozishan section in northern Helan aulacogen, northern China, with emphasis upon the vertical changes and lateral migration of sedimentary facies and environments of the Ordovician strata in the Zhuozishan section. The curves for accommodation spaces are constructed in the light of Fischer plots. The recognition of representative carbonate contourites and presentation of the Ordovician sequence stratagraphic model have provided one useful approach to interpreting the existence of the Helan aulacogen. The transgressive systems tracts in individual sequences should be delineated as important targets for the hydrocarbon exploration in the study area.

关 键 词：桌子山剖面 Fischer图解 等深流沉积 沉积相 层序 

分 类 号：P512.2[天文地球—地质学]