| 鄂尔多斯盆地西南缘奥陶系的对比划分意见及其对中西部油气勘探的意义 |
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| 引用本文： | 孙肇才,胡显穆.鄂尔多斯盆地西南缘奥陶系的对比划分意见及其对中西部油气勘探的意义[J].海相油气地质,2002,7(4):41-58. |
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| 作者姓名： | 孙肇才 胡显穆 |
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| 作者单位： | 1. 中国石化石油勘探开发研究院无锡实验地质研究所
2. 中国石化华北石油勘探局第三普查勘探大队 |
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| 基金项目： | 本文应用的野外实测剖面资料,主要来自作者参加的1957年前地质部与前石油部的合作专题队以及1961-1964年第三普查大队的野外成果. |
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| 摘 要： | 根据野外实测剖面及多年积累的古生物地层资料,建立了鄂尔多斯盆地西南缘包括2个群及以笔石带为据的9个组。强调下奥陶统与中—上奥陶统是该区及整个中国中西部地区的一个重要层序和盆地原型分界。代表 SaukⅢ上部的下奥陶统在鄂尔多斯、塔里木和扬子地区表现为被动边缘上的以台地相碳酸盐岩占优势的伸展盆地沉积,其顶部风化壳是本区及塔里木大油(气)田的主力储层。以 Tippecanoe(O_2—D_(?))层序和以中—上奥陶统为主的地层,是鄂尔多斯和塔里木最有价值的有效烃源岩层,它代表了加里东期聚敛到碰撞的挠曲型复理石至磨拉石前陆盆地的沉积,而古中央隆起是这个弧后前陆的前隆部位。
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| 关 键 词： | 鄂尔多斯盆地 奥陶纪 平凉群 天景山群 马家沟组 生物地层对比 地层划分 烃源岩 前陆盆地 |
View on the Correlation and Demarcation of the Ordovician Series in the Southwestern Margin Region of Ordos Basin and the Significance of Petroleum Exploration in Central-Western Part of China |
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| Sun Zhaocai,Hu Xianmu.View on the Correlation and Demarcation of the Ordovician Series in the Southwestern Margin Region of Ordos Basin and the Significance of Petroleum Exploration in Central-Western Part of China[J].Marine Origin Petroleum Geology,2002,7(4):41-58. |
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| Authors: | Sun Zhaocai Hu Xianmu |
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| Abstract: | Based on the investigation from field outcrops and the data of paleontological strata that are collected during the past da- cades,the author establishes 2 stratigraphic groups and 9 for- mations according as graptolite zones in the Southwestern Mar- gin Region of Ordos Basin.It is emphasized that the Lower Or dovician strata and the Middle-Upper Strata are not only a set of important sequence but also the demarcation of basin proto- type in this region and also the whole central-western part of China.The Lower Ordovician strata that represent the upper part of Sauk Ⅲ exhibit the carbonate rock-predominating de- posits of extensional basins on the passive margins in Ordos basin,Tarim Basin and Yangzi region The weathering crust on the top of the deposits is the significant oil reservoir rock in Or- dos basin and Tarim Basin.The strata predominated by Tippecanoe sequence (O2-D1-2) and the Middle-Upper Series are the most valuable efficient source rock strata,which are the representative deposits of the flexured flysch-molasse fore- land basins formed during Caledonian convergence to collision |
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| Keywords: | Ordos Basin Ordovician Strata division Source rock Foreland basin |
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