论文部分内容阅读
一、煤田地质概况本煤田位于完达山古陆西缘,属晚侏罗世内陆山间盆地型煤田。煤田呈倾伏向斜构造,褶皱轴向北北东。含煤地层厚800～1200米。基底为前古生界花岗岩和花岗片麻岩。基底与含煤地层之间为不整合接触关系。本区含煤地层按岩性,岩相、旋回及含煤性等标志,可划分为两个含煤组:下部北大岭含煤组;上部石头河含煤组。含煤地层上部为南岗砾岩,与含煤地层呈假整合接触(图1)。含煤地层沉积环境不稳定,岩相变化复杂,煤层原生变薄,分叉、尖灭及增厚极为普遍。
First, the geological overview of coalfield This coalfield is located in Wandashan western edge of the ancient land, is a Late Jurassic intracontinental inter-basin basin type coalfield. The coalfield has a dip-syncline structure and its fold axis is north-north east. Coal-bearing formation 800 ~ 1200 meters thick. The basement is the former Paleozoic granite and granite gneiss. There is an unconformity between the substrate and the coal-bearing formation. The coal-bearing strata in this area can be divided into two coal-bearing formations according to lithology, lithofacies, cycle and coal-bearing characters: the lower Beidaling coal-bearing formation and the upper Shihehe coal-bearing formation. The upper part of the coal-bearing strata is Nangang conglomerate, which is in fake and integrated contact with the coal-bearing strata (Figure 1). The sedimentary environment of coal-bearing strata is unstable, the lithofacies changes complicatedly, and the coal seam becomes thinner, bifurcated, pinched out and thickening are extremely common.