| 鄂尔多斯陆表海层序地层中的低位域沉积——以太原组上段桥头砂岩为例 |
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| 引用本文： | 姜烨,李宝芳,王绍昌.鄂尔多斯陆表海层序地层中的低位域沉积——以太原组上段桥头砂岩为例[J].现代地质,2001,15(4):425-430. |
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| 作者姓名： | 姜烨 李宝芳 王绍昌 |
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| 作者单位： | 1. 中国地质大学能源地质系,
2. 石油勘探开发研究院廊坊分院, |
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| 摘 要： | 鄂尔多斯缓坡型陆表海的层序构成通常以海侵和高位体系域为主 ,低位体系域发育在古大陆边缘或缺失。以太原组上部灰岩段中桥头砂岩为例 ,通过对露头、岩心、测井曲线的分析和层序对比以及海平面升降变化对研究区沉积影响的分析 ,认为桥头砂岩形成于不同的三级层序内 ,由 3套低位域下切河谷充填沉积叠置而成 ,说明在盆地内古大陆架上也可以发育低位体系域沉积。桥头砂岩形成于相对海平面下降时期 ,桥 3砂岩在相对海平面上升之后发展为潮河道继续存在。鄂尔多斯深盆气的成藏特点使具有微裂隙和溶蚀孔隙的桥头砂岩具有深盆气勘探和开发的前景。
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| 关 键 词： | 鄂尔多斯 陆表海 低位体系域 桥头砂岩 海平面升降 沉积环境 |
| 文章编号： | 1000-8527(2001)04-0425-06 |
| 修稿时间： | 2001年6月19日 |
LOW STAND SYSTEM TRACT SANDSTONE IN THE SEQUENCE OF EPICONTINENTAL SEA IN ORDOS:A CASE OF QIAOTOU SANDSTONE OF UPPER TAIYUAN FORMATION |
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| JIANG Ye ,LI Bao fang ,WANG Shao chang.LOW STAND SYSTEM TRACT SANDSTONE IN THE SEQUENCE OF EPICONTINENTAL SEA IN ORDOS:A CASE OF QIAOTOU SANDSTONE OF UPPER TAIYUAN FORMATION[J].Geoscience——Journal of Graduate School,China University of Geosciences,2001,15(4):425-430. |
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| Authors: | JIANG Ye LI Bao fang WANG Shao chang |
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| Institution: | JIANG Ye 1,LI Bao fang 1,WANG Shao chang 2 |
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| Abstract: | It is generally supposed that in the Ordos Basin the sequence of the epicontinental sea is mainly composed of transgressive system tract and high stand system tract, without low stand system tract or only with low stand system tract on the continental margin. This paper shows that it is possible that the sediment of low stand system tract can exist in the basin as the case of Qiaotou sandstone of the upper Taiyuan Formation interprets. Through the detailed studies on outcrops, drill cores and well logs and the study on strata correlation, Qiaotou sandstone is supposed to be three sets of incised valley fillings of low stand system tract developing in different sequences under the influence of the sea level eustacy. Three sets of sandstones developed in different depositional environments, and the last set of Qiaotou sandstone turned to tidal river during the sea level rising. According to the reservoir forming characteristics of the Ordos deep basin gas trap, the existance of microfissures and dissolved pores make Qiaotou sandstone be of good value in deep basin gas trap exploration. |
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| Keywords: | Ordos epicontinental sea low stand system tract Qiaotou sandstone sea level eustacy depositional environment |
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