Contrast Study on Porosity and Permeability of Tectonically Deformed Coal and Indigenous Coal in Pingdingshan Mining Area, China
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摘要: 为了研究构造煤孔渗变化特性, 利用平顶山矿区原生结构煤和构造煤, 进行了不同围压、温度、湿度和煤体结构类型等条件下孔隙度及渗透率的实验测定, 对煤层孔渗特性在不同条件下的变化趋势进行了分析.结果表明: 围压、温度、湿度和煤体结构类型4种因素对煤的孔隙度和渗透率均有较大影响, 当温度和围压同时作用时, 围压的作用效果大于温度的作用效果.并用Origin软件对部分实验数据进行了数据拟合, 得出原生结构煤和构造煤的渗透率-孔隙度函数关系.Abstract: Taking the simulation of indigenous coal and tectonically deformed coal in Pingdingshan coal district as the research object, porosity and permeability of different coal samples under different factors are determined in this paper. The variation trend of porosity and permeability under different factors is analyzed. The experimental results show that four factors analyzed have significant impact on both porosity and permeability of coal. The effect of confining pressure is greater than temperature when confining pressure and temperature work together. And part of experiment data are fitted by the Origin software, concluding with the function relationship of porosity and permeability of coal.
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Key words:
- porosity /
- permeability /
- confining pressure /
- temperature /
- moisture /
- tectonically deformed coal
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图 1 煤孔隙度随围压变化曲线
a.原生结构煤；b.构造煤
Fig. 1. Variation curves of porosity under different temperatures and confining pressure
图 2 不同湿度原生结构煤孔隙度随围压变化曲线
Fig. 2. Variation curves of porosity of dried sample and common sample
图 3 粗细粒构造煤孔隙度随围压变化曲线
Fig. 3. Variation curves of porosity of coarse samples and fine samples
图 4 不同条件下原生结构煤和构造煤渗透率变化曲线
a.恒围压条件下原生结构煤渗透率变化曲线；b.恒围压条件下构造煤渗透率变化曲线；c.恒温度条件下原生结构煤渗透率变化曲线；d.恒温度条件下构造煤渗透率变化曲线
Fig. 4. Variation curves of permeability under different conditions
图 5 不同湿度原生结构煤渗透率变化曲线
a.恒定围压条件下；b.恒定温度条件下
Fig. 5. Variation curves of permeability of dried samples and common samples
图 6 粗细粒构造煤渗透率变化曲线
a.恒定围压条件下；b.恒定温度条件下
Fig. 6. Variation curves of permeability of coarse samples and fine samples
表 1 原生结构煤和构造煤煤岩显微组分测定结果
Table 1. Determination of coal maceral
式样名称 镜质组(%) 惰质组(%) 壳质组(%) 矿物(%) 煤级 原生结构煤 61.7 23.5 13.5 1.3 肥煤 61.5 25.5 11.8 1.2 肥煤 构造煤 56.8 24.2 13.4 5.6 肥煤 55.9 23.3 14.9 4.3 肥煤 
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表 2 煤孔隙度测试实验条件
Table 2. Experimental scheme of coal porosity
原生结构煤 构造煤 温度(℃) 围压(MPa) 普通 干燥 细粒 粗粒 K1 K2 K3 K4 25 2~10 K5 K6 K7 K8 45 2~10 K9 K10 60 2~10 注：K1~K10为样品号.
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表 3 煤渗透率测试实验条件
Table 3. Experimental scheme of coal permeability
原生结构煤 构造煤 温度(℃) 围压(MPa) 普通 干燥 细粒 粗粒 S1 S2 S3 S4 25~55 2 S5 S6 S7 S8 25~55 6 S9 S10 25 2~10 S11 S12 S13 S14 25~55 10 S15 S16 S17 S18 40 2~10 S19 S20 55 2~10 注：S1~S20为样品号.
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表 4 不同温度下煤孔隙度与围压函数关系
Table 4. Functions between porosity and confining pressure
温度(℃) 原生结构煤 构造煤 拟合关系φ(%) 相关系数R2 拟合关系φ(%) 相关系数R2 25 5.2597P-0.1421 0.9949 12.611P-0.2335 0.9923 45 4.4449P-0.2729 0.9989 25.178P-0.2711 0.9365 60 4.8410P-0.1908 0.9359 32.484P-0.1748 0.9831
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表 5 恒围压条件下煤渗透率与温度函数关系
Table 5. Functions between permeability and temperature
围压(MPa) 原生结构煤 构造煤 拟合关系K (10-9m2) 相关系数R2 拟合关系K (10-9m2) 相关系数R2 2 K=0.014+ 0.104e-0.113T 0.9984 K=0.146+ 1.24e-0.097T 0.9927 6 K= 0.003e-0.057T 0.9652 K=0.091- 0.006e0.042T 0.9606 10 K=8× 10-4e-0.046T 0.9921 K=0.048- 0.009e0.025T 0.9355
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表 6 恒温度条件下煤渗透率与围压函数关系
Table 6. Functions between permeability and confining pressure
温度(℃) 原生结构煤 构造煤 拟合关系K (10-9m2) 相关系数R2 拟合关系K (10-9m2) 相关系数R2 25 K=0.001+ 0.08e-0.528P 0.9983 K=-0.002+ 0.4e-0.378P 0.9994 40 K= 0.059e-1.068P 0.9987 K=-0.011+ 0.17e-0.27P 0.9967 55 K= 0.061e-0.471P 0.9996 K=0.054+ 0.79e-0.481P 0.9969
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表 7 煤的渗透率与孔隙度的函数关系
Table 7. Functions between permeability and porosity
温度(℃) 原生结构煤 构造煤 拟合关系K (10-2m2) 相关系数R2 拟合关系K (10-2m2) 相关系数R2 25 3×10-10φ11.86 0.9923 6×10-8φ6.33 0.9856 40 5×10-16φ19.36 0.9996 8×10-8φ5.89 0.9570 55 4×10-9φ10.07 0.9872 2×10-6φ5.07 0.9987
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