高煤阶煤孔隙结构及分形特征
发布时间：2018-11-06 17:52
【摘要】：高煤阶煤与中低煤阶煤在孔隙结构特征方面存在明显差异,分形理论为定量描述高煤阶煤储层孔隙特征提供了有效手段。基于扫描电镜、压汞实验和孔渗测试,以华北地区最大镜质体反射率(Ro,max)在1.9%~2.95%之间的9个煤样为研究对象,采用分段回归的方法对各样品进行不同孔径段分形维数计算,并讨论了孔隙结构分形维数与孔隙体积百分比、Ro,max、孔隙度和渗透率的关系。结果表明,高煤阶煤微小孔发育,半封闭孔含量较高,孔隙连通性一般,且孔隙结构具有明显的分段分形特征,同一煤样的超大孔(孔隙半径r5μm)、大孔(0.5μmr5μm)、中孔(0.05μmr0.5μm)和微小孔(r0.05μm)的分形维数依次减小;各煤样超大孔、大孔、中孔分形维数均随Ro,max增加而增加,随对应孔隙体积百分比增加而减小;孔隙度或渗透率与超大孔、大孔和中孔、微小孔分形维数分别呈二次相关、线性正相关、负相关;各分形区间分形维数分布的偏度和峰度与孔隙度或渗透率分别呈高度正相关和负相关,这为高煤阶煤孔隙度、渗透率提供了理想的线性方程(y=ax+b)预测模型。
[Abstract]:There are obvious differences between high rank coal and low rank coal in pore structure characteristics. Fractal theory provides an effective means to quantitatively describe pore characteristics of high rank coal reservoir. Based on scanning electron microscope (SEM), mercury injection test and pore permeability test, nine coal samples with the maximum vitrinite reflectance (Ro,max) of 1.9% and 2.95% were studied. The fractal dimension of pore structure and pore volume percentage, Ro,max, porosity and permeability were calculated by using the method of piecewise regression for different pore size segments of the samples, and the relationship between fractal dimension of pore structure and pore volume percentage, Ro,max, porosity and permeability was discussed. The results show that the micro-pores of high-rank coal are developed, the content of semi-closed pores is high, the connectivity of pores is general, and the pore structure has obvious segmental fractal characteristics, and the pore radius of the same coal sample is very large (r _ 5 渭 m), _ (0.5 渭 mr5 渭 m),). The fractal dimension of mesopore (0. 05 渭 mr0.5 渭 m) and micro pore (r0. 05 渭 m) decreased in turn. The fractal dimension of mesopore increased with the increase of Ro,max and decreased with the increase of the corresponding pore volume percentage. The porosity or permeability has a quadratic correlation with the fractal dimension of super-large pore, mesopore and micro-pore, but the linear correlation is positive and negative. The skewness and kurtosis of fractal dimension distribution in each fractal interval are positively and negatively correlated with porosity or permeability respectively, which provides an ideal linear equation (y=ax b) model for predicting permeability of high rank coal.
【作者单位】： 中国矿业大学(北京)地球科学与测绘工程学院;河南省煤田地质局三队;
【基金】：河南省国土资源厅2015年度省“两权价款”地质科研项目(豫财招标采购2015-1547-7) 国家科技重大专项项目(2016ZX05041004-003) 中国地质调查局科研项目(1212011220794)
【分类号】：P618.11
本文编号：2315031
[Abstract]:There are obvious differences between high rank coal and low rank coal in pore structure characteristics. Fractal theory provides an effective means to quantitatively describe pore characteristics of high rank coal reservoir. Based on scanning electron microscope (SEM), mercury injection test and pore permeability test, nine coal samples with the maximum vitrinite reflectance (Ro,max) of 1.9% and 2.95% were studied. The fractal dimension of pore structure and pore volume percentage, Ro,max, porosity and permeability were calculated by using the method of piecewise regression for different pore size segments of the samples, and the relationship between fractal dimension of pore structure and pore volume percentage, Ro,max, porosity and permeability was discussed. The results show that the micro-pores of high-rank coal are developed, the content of semi-closed pores is high, the connectivity of pores is general, and the pore structure has obvious segmental fractal characteristics, and the pore radius of the same coal sample is very large (r _ 5 渭 m), _ (0.5 渭 mr5 渭 m),). The fractal dimension of mesopore (0. 05 渭 mr0.5 渭 m) and micro pore (r0. 05 渭 m) decreased in turn. The fractal dimension of mesopore increased with the increase of Ro,max and decreased with the increase of the corresponding pore volume percentage. The porosity or permeability has a quadratic correlation with the fractal dimension of super-large pore, mesopore and micro-pore, but the linear correlation is positive and negative. The skewness and kurtosis of fractal dimension distribution in each fractal interval are positively and negatively correlated with porosity or permeability respectively, which provides an ideal linear equation (y=ax b) model for predicting permeability of high rank coal.
【作者单位】： 中国矿业大学(北京)地球科学与测绘工程学院;河南省煤田地质局三队;
【基金】：河南省国土资源厅2015年度省“两权价款”地质科研项目(豫财招标采购2015-1547-7) 国家科技重大专项项目(2016ZX05041004-003) 中国地质调查局科研项目(1212011220794)
【分类号】：P618.11
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