云南洛旺煤矿区上二叠统主采煤层煤质特征及其影响因素

摘要

The Luowang coalmine area is an important coal production area in Yunnan. Coal rank in the area is mainly meager coal, lo-cally anthracite. Based on geological exploration and coal quality tested data, systematically analyzed coal quality characteristics of main mineable coal seam C5 and varying pattern, discussed its impacting geological factors. The result has shown:sulfur content of coal C5 in the area is gradually increasing from southwest to northeast, ash content deceasing from east to west. This is due to sedimentary environment variation of limnic basin to paralic basin from west to east. Horizontally, coal rank in the middle part is anthracite III, grad-ually changed into meager coal toward both east and west ends. Analysis thinks that the hypozonal metamorphism is the main causa-tion, while coal seam buried depth in middle part is deeper than both east and west ends, thus degree of metamorphism is relatively high. Speculation based on structural conditions, the paulopost dynamic metamorphism has made for middle part degree of metamor-phism deepening a certain extent.%洛旺煤矿区是云南重要的煤产地，煤类以贫煤为主，局部为无烟煤。根据地质勘查成果及煤质测试资料，系统分析了该区主采煤层C5煤层的煤质特征及其变化规律，探讨了影响煤质变化的地质因素。结果表明：区内C5煤层硫分由西南向东北逐渐增大，灰分产率自东向西逐渐降低，这一规律主要受自西向东陆相到海陆交互相沉积环境变化的控制。在平面上煤类表现为煤矿区中部为无烟煤三号，东西两端逐渐变为贫煤，分析认为深成变质作用是造成煤类变化的主要原因。矿区中部煤层埋深较东、西两端大，煤变质程度相对高，根据构造条件推测，后期的动力变质作用对矿区中部煤变质程度的加深起了一定的促进作用。