| 鄂尔多斯东北部太原组上部灰岩段高分辨层序地层分析 |
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| 引用本文： | 姜烨,李宝芳.鄂尔多斯东北部太原组上部灰岩段高分辨层序地层分析[J].煤田地质与勘探,2002,30(3):5-8. |
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| 作者姓名： | 姜烨 李宝芳 |
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| 作者单位： | 中国地质大学, 北京 100083 |
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| 摘 要： | 根据对露头、测井和岩心资料的垂向分析和横向对比,结合古生物化石资料,在识别关键性界面的基础上,对鄂尔多斯东北部下二叠统太原组上部灰岩段建立了高分辨层序地层格架,划分出5个三级层序。研究层段为有陆源碎屑混入的碳酸盐缓坡沉积,形成于华北晚古生代最大海侵阶段。各层序分别由低位体系域的下切谷充填沉积的砂岩、砂砾岩,海侵体系的灰岩、泥灰岩、泥岩、煤和高位体系域的碎屑岩和煤组成。区内厚达数十米的桥头砂岩主要由几个层序低位域下切河谷充填沉积叠置而成。通过编制的各层序海侵域灰岩的厚度和分布图,证实层序3、4沉积期海侵范围最大。早二叠世早期海侵来自东南和西南两个方向
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| 关 键 词： | 高分辨层序地层 体系域 下切谷 太原组 鄂尔多斯 |
| 文章编号： | 1001-1986(2002)03-0005-04 |
| 收稿时间： | 2001-07-20 |
| 修稿时间： | 2001年7月20日 |
High-resolution sequence analysis on Limestone Member,Upper Taiyuan Formation,northeastern Ordos |
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| JIANG Ye,LI Bao fang.High-resolution sequence analysis on Limestone Member,Upper Taiyuan Formation,northeastern Ordos[J].Coal Geology & Exploration,2002,30(3):5-8. |
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| Authors: | JIANG Ye LI Bao fang |
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| Institution: | China University of Geosciences, Beijing 100083, China |
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| Abstract: | According to the analysis from outcrops,well logs and cores,in conjunction with the analysis on palaeontologic fossil assemblages,the Limestone Member of Lower Permian of northeastem Ordos is subdivided into 5 sequences based on the identification of key boundaries.The Limestone Member developed in the maximum transgression of Upper Paleozonic,is of carbonate ramp mixed with terrestrial clastics,of typical epiric sea depositional characteristics.The distribution of depositional facies is strictly controlled by sea level eustacy.Each sequence is composed of incised valley sandstone of low system tract,limestone,marl,coal and mudstone of transgressive system tract and clastics and coal of high system tract.It is recognized that the stacked thick sand stones are developed in incised valleys from three different sequences.The contour maps of limestone display that the maximum transgression is during Sq3 and Sq4,and the mainly transgression directions are from SW and SE of the study area. |
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| Keywords: | high resolution sequence system tract incised valley fill Taiyuan Formation northeastern Ordos |
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