沁水盆地东南部高阶煤孔隙分形特征及意义

发布时间：2018-04-05 19:10

本文选题：沁水盆地　切入点：低温氮吸附　出处：《河南理工大学学报(自然科学版)》2017年02期

【摘要】：为研究有利于煤层气勘探开发的煤储层孔隙结构特征,以沁水盆地东南部寺河矿和赵庄矿的晚古生代高阶煤为研究对象,基于低温氮吸附数据,运用孔隙分形研究方法,揭示高阶煤中综合分形维数与孔径分布、镜质组反射率、兰氏体积与兰氏压力之间的关系。研究表明,沁水盆地南部高阶煤在不同孔径段内的孔隙具有明显的分形特征,煤样综合分形维数分布在2.47~2.97;煤样的综合分形维数与煤镜质组反射率具有正相关性,即煤样孔隙的粗糙度随着镜质组反射率的增高而变得更加粗糙;综合分形维数随着比表面积、总孔容、微孔及过渡孔孔容所占比例增加而增大,而随着中孔孔容所占比例的增加而减小。综合分形维数可以反映高阶煤的煤层气开发状况,即高阶煤中煤的综合分形维数越高,越有利于煤层气的开发。
[Abstract]:In order to study the pore structure characteristics of coal reservoir in favor of coalbed methane exploration and development, the late Paleozoic high-order coal of Sihe and Zhaozhuang mines in southeastern Qinshui Basin was studied. Based on the data of nitrogen adsorption at low temperature, the pore fractal method was used.The relationship between synthetic fractal dimension and pore size distribution, vitrinite reflectance, Langley volume and Ranch pressure in high-order coal is revealed.The results show that the porosity of high-order coal in different pore sizes in the southern Qinshui Basin has obvious fractal characteristics, and the comprehensive fractal dimension of coal sample is 2.47 ~ 2.97, and the comprehensive fractal dimension of coal sample has a positive correlation with the reflectance of coal vitrinite.That is, the roughness of coal pore becomes more rough with the increase of vitrinite reflectance, and the comprehensive fractal dimension increases with the increase of specific surface area, total pore volume, micropore and transitional pore volume.However, with the increase of the proportion of mesoporous volume, it decreases.The comprehensive fractal dimension can reflect the coalbed methane development of high-order coal, that is, the higher the comprehensive fractal dimension of high-order coal is, the more favorable it is to the development of coal-bed methane.
【作者单位】：煤与煤层气共采国家重点实验室;河南理工大学资源环境学院;中原经济区煤层(页岩)气河南省协同创新中心;
【基金】：国家自然科学基金资助项目(41402094) 山西省煤基金重点科学攻关项目(MQ2014-03) 河南理工大学博士基金资助项目(B2011-0B)
【分类号】：P618.11

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