| 大同煤田构造特征及太原组赋煤边界 |
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| 引用本文： | 郭万忠,程岳宏,高宇平,陈振国,张郑伟,王存.大同煤田构造特征及太原组赋煤边界[J].煤田地质与勘探,2015,43(5):1-7. |
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| 作者姓名： | 郭万忠 程岳宏 高宇平 陈振国 张郑伟 王存 |
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| 摘 要： | 为了总结大同煤田构造特征及二叠系太原组赋煤边界形成条件,结合野外露头、钻孔岩性、三维地震等资料,分析了大同煤田构造区带划分、地层结构样式、构造演化及应力场特征,明确了二叠系赋煤边界成因机制。研究表明:晚古生代以来,大同煤田主要经历了印支、燕山和喜山期3期构造运动,其中燕山期构造最为复杂,具有幕式、挤压伸展交替演化特征,控制了煤田现今的构造格局;煤田由东部逆冲断裂构造带,中部向斜-单斜构造带和西部隆起构造带组成,煤田内部断裂多为NW-NWW和NE-NEE向,前者形成时期早,规模普遍较大;不同构造期应力作用控制着二叠系煤层的赋存特征,印支早期NS向挤压作用,控制煤田东北部边界,燕山期控制煤田东缘、西缘和西南缘边界。
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| 关 键 词： | 赋煤边界 地层结构 构造演化 二叠系 大同煤田 |
| 收稿时间： | 2014-09-12 |
Structural characteristics and coal-bearing boundaries of Taiyuan Formation in Datong coalfield |
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| Abstract: | Through analyzing the structural zones, tratigraphic pattern, tectonic evolution and stress field features of Datong coalfield in combination with the data of core, outcrop and 3D seismic exploration, the formation mechanism of Permian coal-bearing boundary is revealed. Studies show that Datong coalfield was reformed mainly in the Indosinian, Yanshanian, and Himalayan tectonic orogenies since late Paleozoic, and Yanshanian tectonic movement was the most complicated with the episodic activities and the alternation of extension and compression, which controls the present tectonic framework. Datong coalfield consists of eastern thrust fault zone, central anticline-syncline fold belt and western uplift zone. Fractures inside were mainly developed in NW-NWW and NE-NEE, and the former was formed earlier and with a larger scale. The tectonic stress in different stage controlled the occurrence characteristics of Permian coal seam, NS-trending compression in the early Indosinian dominated the northeastern margin of the coalfield, while the stress in Yanshanian period controlled the eastern, western and southwestern boundaries. |
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