| 淮南煤田二叠系高分辨率层序地层学特征 |
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| 引用本文： | 李增学,魏久传,金秀昆.淮南煤田二叠系高分辨率层序地层学特征[J].地层学杂志,2001,25(1):34-39. |
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| 作者姓名： | 李增学 魏久传 金秀昆 |
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| 作者单位： | 山东科技大学地球科学系 |
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| 基金项目： | 煤炭科学基金资助项目!(97地 10 5 0 7)部分成果 |
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| 摘 要： | 在对淮南煤田二叠系不同周期地层基准面旋回识别和分析的基础上 ,进行了层序地层划分 ,尤其是进行了二叠系四级、五级高分辨率层序的识别与划分。淮南煤田二叠系三级层序内部具有明显的三分性 ,即一个三级层序由底部的低水位体系域、中部的水进体系域和上部的高水位体系域构成。其中水进体系域较薄 ,而低水位体系域和高水位体系域较厚 ,这说明华北南部二叠纪聚煤盆地基准面以下降周期为主导 (持续时间较长 ) ,水进 (盆地水域扩张 )期持续时间较短。基准面升降高频振荡性的变化 ,使盆地沉积环境发生频繁交替 ,从而导致盆地聚煤作用发生高频率变化。淮南煤田二叠系发育煤层达 2 6层之多 ,就是盆地基准面升降高频性变化的结果。研究表明 ,具有工业价值的煤层主要形成于高水位体系域。
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| 关 键 词： | 高分辨率层序 地层基准面旋回 二叠系 淮南煤田 安徽 |
| 文章编号： | 0253-4959(2001)01-0034-06 |
| 修稿时间： | 1999年2月26日 |
HIGH-RESOLUTION SEQUENCE STRATIGRAPHIC CHARACTERSTICS IN THE PERMIAN FROM HUAINAN COALFIELD |
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| LI Zeng xue,WEI Jiu chuan,and JIN Xiu kun.HIGH-RESOLUTION SEQUENCE STRATIGRAPHIC CHARACTERSTICS IN THE PERMIAN FROM HUAINAN COALFIELD[J].Journal of Stratigraphy,2001,25(1):34-39. |
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| Authors: | LI Zeng xue WEI Jiu chuan and JIN Xiu kun |
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| Abstract: | The stratigraphic base level cycles of various ranks in the Permian of the Huainan Coalfield are identified. The high resolution sequences especially the fourth and fifth order high resolution sequences are subdivided. Study shows that the internal architecture of the third order sequences in the study area is composed of the lowstand, transgressive and highstand systems tracts. The thicknesses of the transgressive systems tracts are thinner than the other two, which indicates that the base level subsidence was dominated in the Permian. The persisting time of the transgressive period was short. The high frequency rise and fall of the base level caused the alternation of depositional environment in the basin, which in turn, lead to the variation of the coal accumulation. The Permian coal beds of the Huainan coalfield are as many as 26 layers, resulting from the high frequency changes of the base level rise and fall. The research also indicates that the coal beds with industrial value are mainly formed in the highstand systems tracts. |
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| Keywords: | high frequency sequences stratigraphic base level cycle Permian Huainan Coalfield An |
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