陇东地区刘园子井田煤层对比特征

On Coal Seam Correlation Characteristics in Liuyuanzi Mine Field in Longdong Area

煤层对比研究是煤炭资源勘探、矿井采掘过程中重要的地质工作.本文以陇东地区刘园子井田煤层为研究对象,在综合刘园子井田地质构造和沉积环境的基础上,从煤层厚度分布、煤层结构、煤层层间距、岩性岩相-沉积旋回及煤层层位、可采煤层煤质5个方面对井田内的煤层进行对比分析.结果表明:刘园子井田可采煤层皆具有向斜中心较厚,外围较薄,北部较厚,南部较薄的变化规律,多为厚-特厚煤层,煤层结构较易辨别对比,煤层层间距存在明显的差异;岩性岩相上存在上细下粗的粒度组合形式;可采煤层的煤质具有明显差异及变化规律.这对有效追踪煤层在层序地层中位置的变化情况,为陇东地区煤炭资源的勘查开发提供指导和借鉴具有重要意义.

Coal seam comparative study is an importantly geological work in coal resource exploration and mine excavation. This paper, taking the Liuyuanzi coal field of Longdong region as the research object and taking the comprehensive geological structure and sedimentary environment into consideration, the coal seam in the field is compared and analyzed from the five aspects, namely distribution of coal seam thickness, coal seam spacing, lithologic lithofacies sedimentary cycle and coal seam horizon, and coal quality in recoverable coal seam. Results show that the coal seams in Liuyuanzi are thicker in the oblique center, thinner in the periphery; thicker in the north and thinner in the south, and mostly thick-to-thick coal seams, the structure of coal seam easier to distinguish and the difference of coal seam spacing is obvious. Lithology, lithofacies with coarse and fine particle size combinations, there are obvious differences and changing rules of coal quality in recoverable coal seam. This has laid the basis for effectively tracking the changes in the position of the coal seam in the sequence stratigraphy, which is of great significance to plan and guide the exploration and development of coal resources in Longdong region.