华北地台晚石炭世-早二叠世含煤岩系聚煤规律研究

发布时间：2018-04-26 23:05

本文选题：华北地台 + 晚石炭世　；参考：《煤炭科学技术》2017年09期

【摘要】：为了建立华北地台晚石炭世-早二叠世层序地层格架,绘制相应的岩相古地理图,找出华北地台聚煤作用控制因素,通过对野外露头及钻孔剖面资料分析等工作,将华北地台晚石炭世-早二叠世含煤地层划分为7个三级层序,煤层主要发育在SⅢ3和SⅢ5层序。利用单因素分析多因素综合作图法恢复了各层序中岩相古地理,并对煤层分布规律进行分析,结果表明:SⅢ3层序中煤层发育受到沉积相南北分异、东西展布特征的控制,华北地台北缘以河流泛滥盆地沉积为主,煤层层数少但单煤层厚度大,南缘以碳酸盐台地沉积为主,煤层层数众多但单煤层厚度小,SⅢ3层序的聚煤中心主要位于华北地台北部地区;SⅢ5层序中煤层受到沉积相和基底沉降速率的双重控制,碎屑沉积不活跃沉积相带有利于成煤,30~40 m的层序地层厚度地区有利于成煤,SⅢ5的聚煤中心主要位于河南、京津冀和银川附近地区。
[Abstract]:In order to establish the Late Carboniferous and Early Permian sequence stratigraphic framework of the North China platform, draw the corresponding lithofacies palaeogeographic map and find out the controlling factors of coal accumulation in the North China platform. Through the analysis of the outcrop and borehole section data, the Late Carboniferous Early Permian coal bearing strata in the North China Platform are divided into 7 three order sequences, and the coal seam is mainly developed. In the sequence of S III 3 and S III 5 sequence, the lithofacies palaeogeography of each sequence was restored by single factor analysis, and the distribution of coal seams was analyzed. The results showed that the development of coal seam in the S III 3 sequence was controlled by the north-south differentiation of the sedimentary facies and the characteristics of the distribution of the East and the west, the north margin of the North China platform was dominated by the river flood basin deposit, and the coal bed layer was mainly in the north margin of the North China platform. Few but single coal seam thickness is large, the south margin is mainly carbonate platform deposit, the coal seam layer is numerous but the single seam thickness is small, the coal gathering center of S III 3 sequence is mainly located in the Taipei region of North China; the coal seam in the S III 5 sequence is controlled by the sedimentary facies and the basement sedimentation rate, and the debris sedimentary inactive sedimentary facies is beneficial to the coal formation, 30~40 M The thickness of sequence stratigraphy is favorable for coal formation. The coal accumulation centers of S III 5 are mainly located in Henan, Beijing, Tianjin and Yinchuan.

【作者单位】：中国矿业大学(北京)地球科学与测绘工程学院;中国神华海外开发投资有限公司;陕西能源集团研究院;
【分类号】：P618.11

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