吐哈盆地沙尔湖煤田煤质煤岩特征及煤相分析  

Analysis on quality,petrography and facies of coal seam in Shaerhu Coalfield of Turpan-Hami Basin

作　　者：李玉坤 李广 LI Yukun;LI Guang(No.1 Geology Survey Party of Xinjiang Bureau of Geology and Mineral Resources Explorotion and Development, Changji 831100,China)

机构地区：[1]新疆维吾尔自治区地矿局第一地质大队,新疆昌吉831100

出　　处：《煤炭科学技术》2019年第5期198-205,共8页Coal Science and Technology

摘　　要：吐哈盆地位于新疆东部天山地区,盆地内侏罗系是一套重要的含煤地层,赋存丰富的煤炭资源,以现代沉积学、煤岩学、煤化学和煤相学理论为指导,充分利用煤心样品的测试数据与煤岩鉴定等资料,对研究区煤质、煤岩和煤相特征进行了分析研究。研究结果表明:煤质特征为特低灰-中灰分煤、特低硫-中等硫煤、中-中高发热量煤;显微煤岩类型分析表明煤层顶部为微镜煤,煤层下部为微镜惰煤;顶部煤层沼泽类型应为覆水森林沼泽,沉积环境为近湖沼-浅沼相,中下部煤层沼泽类型主要为湿地森林沼泽;沉积环境为浅沼相。综合分析认为研究区煤层形成过程中总体为一个缓慢下沉水进过程,主要成煤期沼泽环境稳定,沉积环境为浅沼相,形成了巨厚C8煤层,之后沼泽覆水程度逐渐加深,沉积环境也向湖沼-浅沼相演变。The Turpan-hami Basin is located in the Tianshan area in eastem Xinjiang, the Jurassic system in the basin is an important coal-bearing statum with abundant coal resources. Based on the theory of sedimentology, coal petrology, coal chemistry and coal petrography, the characteristics of quality, lithic facies and coal facies in seams have been analyzed by making full use of the test data of coal core samples and the identification of coal and rock. The study results show that the quality characteristics have exceptionally low-middle ash content, exceptionally low-middle total sulfir, middle-high calorific value and ash content, volatile matters, total sulfur. The analysis of microlithotype showed that the upper of seams are vitrite, the lower of seams are vitrineite. Through the analysis of coal facies, it is summarized that the swamp type of upper seam was water overlying forest swamp while the sedimentary environment was nearly limmic-telmatic, the swamp type of middle-lower seam was mainly wet forest swamp while the sedimentary environment was nearly telmatic. Through comprehensive analysis, we conclude that the forming process of seams was totality a slowly sinking water progressive process, the swamp environment was steady while the sedimentary environment was telmatie in the main coal-fomning period and thick Seam C8 has fomed, after that the degree of water overlying increases gradually, the sedimentary environment also develop to limnic-telmatic. Some basis have been provided for the coal assessment, the comparison of the seams and clean utilization of coal classification through the research.

关 键 词：吐哈盆地 沙尔湖煤田 煤质 煤岩 煤相 

分 类 号：TD164[矿业工程—矿山地质测量]