二连盆地褐煤矿物质特征及其对孔隙结构的影响

发布时间：2018-06-20 12:49

本文选题：二连盆地 + 褐煤　；参考：《煤炭科学技术》2017年09期

【摘要】：为深入探讨不同矿物对褐煤孔隙结构特征的影响,以二连盆地三大凹陷主褐煤层为研究对象,采用全岩及黏土X射线衍射、扫描电子显微镜、低温氮吸附、压汞试验等分析测试手段,对样品的矿物质特征和孔隙特征进行了分析,并重点探讨了矿物对孔隙结构的影响作用。结果表明,二连盆地三大凹陷主煤层褐煤矿物以黏土矿物及石英为主,其他矿物含量较小,黏土矿物以高岭石为主;矿物多为与有机质伴生,呈分散状分布在有机质中;研究区褐煤有3种类型的吸附/解吸滞后线,孔体积分布以双峰发育为主;分形维数为2.473~2.616,吸附孔分形维数总体大于渗流孔分形维数,总孔隙分形维数主要受吸附孔控制;孔隙分形维数与腐植组含量、黏土矿物呈负相关关系,而与惰质组含量、灰分、石英含量呈正相关关系;煤中有机显微组分、矿物组分对孔隙分形维数的影响分别主要取决于腐植组含量及石英含量。
[Abstract]:In order to probe into the influence of different minerals on the pore structure of lignite, the main lignite beds in three big sag of Erlian Basin were studied by X-ray diffraction of whole rock and clay, scanning electron microscope and nitrogen adsorption at low temperature. The mineral and pore characteristics of the samples were analyzed by means of mercury injection test and the effect of minerals on pore structure was discussed. The results show that lignite minerals are mainly clay and quartz in the main seams of the three major sag in Erlian Basin, but the other minerals are small, kaolinite is the main clay, and most of the minerals are associated with organic matter and distributed in the organic matter. There are three types of adsorption / desorption hysteresis lines in the study area, the pore volume distribution is mainly bimodal, the fractal dimension is 2.473 ~ 2.616, the fractal dimension of adsorption pore is larger than the fractal dimension of percolation pore, and the total pore fractal dimension is mainly controlled by adsorption pore. The fractal dimension of pore is negatively correlated with the content of saprophytic group, clay mineral, but positively correlated with the content of inertinite, ash and quartz. The effect of mineral composition on the fractal dimension of pore is mainly determined by the content of saprophytic group and quartz.
【作者单位】：中国矿业大学资源与地球科学学院;煤层气资源与成藏过程教育部重点实验室;河北工程大学地球科学与工程学院;
【基金】：国家科技重大专项资助项目(2016ZX05041-001) 国家自然科学基金重点资助项目(41530314)
【分类号】：P618.13

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