浅谈沁水盆地郑庄区块陷落柱形成机理及分布规律

A Preliminary Study on Genetic Mechanism and Distribution Regularity of Zhengzhuang Block Collapse Column in Qinshui Basin

陷落柱的存在使煤层的连续性受到破坏,并且沟通了相邻富水层,已成为制约煤层气勘探开发成效的重要因素之一。为了提高勘探成效,规避风险,对沁水盆地郑庄区块煤系地层陷落柱的成因机理和条件、剖面形态及其地震反射特征、分布规律和影响因素等方面进行了系统分析与研究,认为该区在由南西向北东倾伏的大型鼻状构造背景控制下,陷落柱分布呈现北东向带状分布、东西成群出现的特点,主要是受奥陶系石灰岩沉积的不均质性、该区地下水强径流方向和区域构造背景控制,而与局部褶皱走向无关。

The collapse column damages the continuity of coal seams, and connects the adjacent water-rich layers, it has been considered as one of the most important factors restricting the effective CBM exploration and development. To improve the exploration efficiency and avoid risks, authors in this paper systematically analyze and study the origin mechanism and conditions, the profile shape and seism reflection features, distribution regularity and effect factors of karst collapse in coal measure strata in Zhengzhuang Block in Qinshui Basin. With a large-scale structure overthrew from southwest area to northeast, the collapse columns present ribbon distribution from north to east, and crowd in the east and west. This is caused by inequality of Ordovician limestone deposits, strong water runoff direction underground of the area, and regional structural background; and it has nothing to do with the trend of local drape.